Intermittent No-Start
NOTE: This condition can affect any car with an
immobilizer system, including ’98–99 Accords,
’98–99 Odysseys, and ’97–99 Preludes.
Before you dive into extended diagnostics to
solve an intermittent no-start, find out the customer’s
key ring setup (how many keys, the size of the key
ring, what the key fob’s made of). Under certain
conditions, any combination of too many keys, a large
key ring, and a metal key fob can contribute to an
occasional no-start. Here’s how:
While inserting the key into the ignition switch, the
customer also grabs the metal key fob, the
key ring, or the other keys. Then, with this extra metal
right next to the ignition key, the key is quickly
turned. Metal near the key and a quick turn of the
ignition switch cause interference with the
immobilizer signal, and the car doesn’t start.
Depending on the type of immobilizer system, the
engine won’t crank at all, or it’ll crank without
starting.
Radio Plays With Key OFF
On all models except Passport, the cellular phone battery
can power the radio, even with the ignition switch OFF.
This is because some 12 V phone adapter plugs don’t have
a diode to prevent phone power from going to the radio.
High-quality 12 V adapters have the diode that prevents
this.
Dashboard “Buzz� on
Early 1997 Preludes
On some early-production 1997 Preludes, a buzz from
the right side of the dash may be caused by the A/C
expansion valve tubes rubbing together or touching the
evaporator housing. To verify the noise, test-drive the
car with the glove box open. If the buzz comes from
behind the glove box, here’s what to do.
1. Recover the refrigerant from the A/C system.
2. Remove the evaporator. (Evaporator R & R is in the
1997 Prelude S/M, pages 22-40 and 22-41.)
3. Separate the upper and lower evaporator housings,
and remove the core.
4. Separate the expansion valve tubes 8 mm where they
cross together.
5. Bend the upper tube 10 mm closer to the core to
make clearance between it and the housing.
6. Reinstall the upper and lower housings, reinstall the
evaporator, and recharge the A/C system.
Welcome to OBD II
The ’95 Accord V6 was the first Honda to feature a
PGM-FI system that meets the new on-board diagnostics
(OBD) requirements known as OBD II. The rest of our
models will have OBD II systems by the ’96 model year.
OBD II is a comprehensive diagnostic system designed
to allow any skilled technician to repair an engine
management system problem on any OBD-II-equipped
vehicle with the aid of an OBD-II-compatible scan tool.
With the scan tool, you can now read much of the same
sensor data that the engine control module (ECM) sees.
In many cases, you no longer have to reproduce a
diagnostic trouble code (DTC); reading the data will tell
you whether there’s a malfunction or not.
The SAE-established OBD II guidelines include these
changes:
• A universal 16P diagnostic connector, with
standardized pin assignments, called the data link
connector (DLC).
• A standard list of DTCs for all manufacturers.
• Data snapshot capability in the ECM when a fault
occurs.
• The ability to record a DTC whenever a fault occurs
that affects emissions.
• The ability to erase DTCs with the scan tool.
The SAE-defined DTCs, for example P0131, are
five-character alphanumeric codes:
• First character, area of vehicle: B for body, C for
chassis, P for powertrain, and U for undefined.
(Currently, only powertrain codes have been defined.)
• Second character, code origin: 0 for SAE-controlled
codes, 1 for manufacturer-controlled codes.
• Third character, system affected: 1 and 2 for fuel and
air metering, 3 for ignition system or misfire, 4 for
auxiliary emission controls, 5 for vehicle speed and
idle controls, 6 for computer and output circuits, and 7
and 8 for transmission.
• Fourth and fifth characters, the fault: general
malfunction, high or low voltage or frequency, or “out
of range.�
Clearing ABS Wheel
Sensor DTCs
When some vehicles with ABS are run on a lift, the
ABS control unit can set a wheel sensor DTC(s) and
turn on the ABS indicator. Some wheel sensor DTCs
keep the ABS indicator on until the vehicle is driven
above 7 mph.
To turn off the ABS indicator, clear the DTC with a
PGM Tester, and drive the vehicle above 7 mph.
When the ABS control unit gets a normal vehicle
speed input from all four wheels, it completes the
ABS DTC clearing procedure and turns off the
indicator.
Coping With Static Shock
Static shock can be irritating to downright painful.
That’s because when you get shocked from what’s
commonly called “static electricity� it’s really high
voltage electricity. Depending on conditions, it can
actually reach a potential of several thousand volts,
and the drier the air, the greater your chances of
getting shocked.
What Causes Static Shock
Static electricity appears whenever the quantities of
positive and negative electrical charges in something
aren’t perfectly equal. Normally the positives cancel
the negatives, and everything behaves electrically
neutral. But if two insulators of different materials
contact each other, then the electrical charges of the
material transfer between the surfaces. One surface
ends up with more negative charges than positive,
and has a negative charge imbalance. The other
surface has fewer negative charges than positive, so it
has a positive charge imbalance. Both surfaces are
electrically charged and a high potential voltage exists
between them.
As long as these surfaces stay together, their electrical
charges cancel each other out. But if you separate
them, you also separate their polarities (a positive
charge stays with one, a negative charge with the
other). Now the potential voltage between the two
surfaces rises dramatically. If you bring the two
surfaces back together, at some point, the opposite
polarities jump the gap and rejoin, producing a
high-voltage spark.
From our little science lesson, you can see what
happens in dry weather when you step out of the
vehicle and get shocked closing the door. Your body
becomes electrically charged from your clothes (an
insulator) contacting the seats and seat-backs (a
different insulator). When you step out, you’re taking
just one polarity of charge along with you, while the
seat keeps the opposite polarity. At the same time, the
seat is causing the entire vehicle to become
electrically charged by a process called “Faraday’s
Icepail Effect.� The potential voltage between you
and the vehicle now surges up to 10,000 or even
20,000 volts. If you’re wearing shoes, especially those
with rubber soles, the charge has no chance to leak to
ground. So when you reach out to close the door,
which is grounded to the vehicle, the opposite
polarities rejoin at your finger and ZAP!, you get
shocked.
How to Prevent Static Shock
Now that you know what causes static shock, what
can be done to prevent it? Here are some helpful tips
to pass along to your customers:
• Avoid wearing clothes that contribute to static
shock. Clothes made from wool or from synthetic
materials such as nylon, polyester, or plastic, put a
greater electrical charge on your body than clothes
made from cotton or other materials. (A ’98 study
done in the UK recorded peak body voltages of
21,000 volts when wearing nylon clothes, 9,000
volts for wool clothes, and 7,000 volts for cotton
clothes.) Also, consider choosing leather upholstery
instead of fabric. Fabric upholstery creates a greater
charge imbalance than leather does.
• Shoe soles create a charge imbalance and work as
insulators as well. To avoid getting shocked, don’t
wear rubber-soled shoes—they create a significant
charge imbalance, and when you step out of the
vehicle, the insulating properties of rubber keep the
charge from leaking to ground. Try wearing thin,
leather-soled shoes instead.
• Try getting into the habit of holding your keys as
you step out of the vehicle, then grip one of the
keys firmly by the metal, and tap the door lock
cylinder with the tip of the key. The spark will still
jump, but it won’t be painful. The tip of the key will
take the spark’s punishment instead of your tender
finger.
• Try spraying the seats, seat-backs, floor mats, and
carpet with some anti-static liquid such as
ScotchGard or Static Gard, or your own brew from
mixing 1 part liquid fabric softener with 10 parts
water. This spray treatment dampens the surfaces
making them slightly conductive, so the separated
charges can instantly flow back together. This
treatment generally lasts up to 3 months. On
vehicles with side airbags, don’t get the front
passenger’s seat too wet, or it may trigger the SIDE
AIRBAG indicator (see the article Side Airbag
Indicator Comes On in the November ’00 edition.)
• If you get shocked when you drive up and touch
outside objects that are grounded (mail boxes, toll
booths, drive-up ATMs, etc.), the vehicle itself has
probably created a charge imbalance. Waiting
several seconds before touching any outside objects
that are grounded can sometimes allow the charge
to dissipate.
Warranty Extension: Accord, Odyssey, and Prelude Automatic Transmission
(Supersedes 02-062, dated May 28, 2004)
BACKGROUND
In certain vehicles, a higher than normal number of
automatic transmissions may have defects in material
or workmanship that could cause premature wear or
failure. To ensure that customers have adequate
warranty coverage, American Honda is increasing the
warranty on the transmission and the torque converter
to 7 years or 100,000 miles, whichever occurs first.
CUSTOMER NOTIFICATION
All owners of 1999 Odysseys were mailed a notification
of the warranty extension. Owners of other affected
vehicles were mailed the notification in October 2002.
A copy of the notification is at the end of this service
bulletin.
This warranty extension does not apply to any vehicle
that has ever been declared a total loss, or any that
has been issued a salvage, branded, or similar title
under any state’s law. To check for vehicle eligibility,
you must do a VIN status inquiry on the iN.
CORRECTIVE ACTION
If standard diagnostics confirm an internal problem with
the torque converter or the automatic transmission,
replace the affected unit.
September 16, 2003
03-062
Applies To: ALL
Seat Belt Slow to Retract
(Replaces 91-030, dated January 22, 1996)
SYMPTOM
The seat belt will not retract all the way, or retracts
slowly.
PROBABLE CAUSE
Dirt on the seat belt webbing and guide.
CORRECTIVE ACTION
Clean the seat belts and guides with a mild soap and
water solution, or isopropyl alcohol. This applies only to
three-point active and passive seat belt systems, not to
motorized systems.
REQUIRED MATERIALS
Required only for three-point passive seat belts.
Teflon Tape (ten pieces per package):
P/N 81496-SH3-505, H/C 4008041
WARRANTY CLAIM INFORMATION
This repair is covered by the Lifetime Seat Belt Limited
Warranty.
Three-Point Active Seat Belt
Three-Point Passive Seat Belt
Failed Part: P/N 818A0-SM1-A05ZB
REPAIR PROCEDURE
Three-Point Active Seat Belts
1. Use either isopropyl alcohol, or prepare a solution
of 5 ounces of mild dishwashing liquid in a gallon of
warm water.
Do not use strong cleaning solutions, upholstery
cleaners or commercial automotive interior
cleaners. They can affect the durability of the
webbing.
2. Soak a clean cloth in the cleaner. Insert the cloth
between the seat belt and metal loop on the upper
anchor. Use a credit card or similar item to help
insert the cloth into the loop. Work the cloth back
and forth to clean the dirt out of the inside of the
loop.
3. Pull the seat belt out fully. Soak a clean cloth in the
cleaner, and clean both sides of the seat belt
webbing. Dry the webbing thoroughly with a clean
cloth. Do not use a hair dryer or similar device.
4. Test the belt for proper retraction by pulling the
latch plate down to the floor of the vehicle and then
releasing it. The belt should retract fully in 4
seconds or less.
NOTICE
2 of 2 03-062
Three-Point Passive Seat Belts
1. Clean the metal loop in the upper anchor as
described for Three-Point Active Seat Belts.
2. Remove the door panel and the seat belt guide.
Refer to the appropriate service manual.
3. Soak a clean cloth in the cleaner, and clean both
sides of the seat belt webbing. Dry the webbing
thoroughly with a clean cloth. Do not use a hair
dryer or similar device.
4. Clean and dry the seat belt guide, then put a piece
of teflon tape on the inside. Use the teflon tape
specified in this service bulletin; other brands or
types of tape may eventually peel off and restrict
seat belt movement.
5. Install the seat belt guide and the door panel.
6. Test the belt for proper retraction by pulling the
latch plate down to the floor of the vehicle and then
releasing it. The belt should retract fully in four
seconds or less.
Service Bulletin
Applies To: 1997–2001 Prelude – ALL
Rear Suspension Clunks
(Replaces 99-084, Rear Suspension Clunks, dated November 9, 1999)
SYMPTOM
When driving over bumps, you hear a clunk noise from
the rear suspension.
PROBABLE CAUSE
The upper spacers in the rear damper assemblies
compress over time, causing excessive clearance.
CORRECTIVE ACTION
Replace the upper collars in both rear damper
assemblies.
PARTS INFORMATION
Damper Collar (two required):
P/N 52728-S30-004, H/C 6655195
WARRANTY CLAIM INFORMATION
In warranty: The normal warranty applies.
Operation Number: 417123
Flat Rate Time: 1.2 hours
Failed Part: P/N 52728-SM1-A02
H/C 3861473
Defect Code: 042
Contention Code: B07
Template ID: 00-090A
Skill Level: Repair Technician
Out of warranty: Any repair performed after warranty
expiration may be eligible for goodwill consideration by
the District Service Manager or your Zone Office. You
must request consideration, and get a decision, before
starting work.
REPAIR PROCEDURE
1. Remove the rear damper assembly from the
vehicle. Refer to section 18 of the service manual.
2. Disassemble the rear damper assembly.
3. Reassemble the damper assembly with a new
damper collar.
4. Install the damper assembly in the vehicle.
5. Repeat this procedure on the other rear damper
assembly.
SELF-LOCKING NUT
(Replace.)
DAMPER MOUNT WASHER
DAMPER RUBBER
DAMPER MOUNT BASE
DAMPER RUBBER
SPRING MOUNT RUBBER
REAR DAMPER ASSEMBLY
DAMPER COLLAR
(Replace.)
Applies To: 1997–01 Prelude – ALL
Immobilizer System (Type 1)
(Supersedes 00-039, dated August 27, 2002)
All 1997–01 Preludes have a Type 1 immobilizer
system that disables the vehicle unless a programmed
ignition key is used. In this service bulletin, a
programmed ignition key is a transponder-type key that
has been cut to fit the ignition switch and whose
transponder ID code is recognized by the immobilizer
system. If you try to start the engine without a
programmed ignition key, the engine cannot crank.
This service bulletin covers
• Immobilizer system components
• Consequences of a lost key
• Adding programmed ignition keys
• Clearing transponder codes of lost programmed
ignition keys
• Starting the engine without a programmed ignition
key
• Replacing the immobilizer control unit
• Replacing the ECM
• Substituting a known-good ECM
It also has a customer situation and required items
chart.
You can find more information about the immobilizer
system in the Body Electrical section of the 1997–99
Prelude Service Manual.
WARRANTY CLAIM INFORMATION
None. This service bulletin is for information only.
IMMOBILIZER SYSTEM COMPONENTS
The immobilizer system includes the
• Immobilizer system keys (two master keys, one valet
key, and one learning key at new vehicle delivery)
• Immobilizer system indicator
• Immobilizer receiver
• Immobilizer control unit
• Engine control module (ECM)
Immobilizer System Keys
The vehicle comes with two master keys (black grip),
one valet key (gray grip), and one learning key (red
grip).
Each master and valet key has a transponder in its grip
that outputs an ID code when you insert the key into
the ignition switch. The immobilizer system uses this ID
code to determine whether to start the engine. There
are no batteries or other serviceable parts inside the
keys.
The learning key has a unique ID code that is matched
to the vehicle’s immobilizer control unit. It lets you
rewrite the immobilizer control unit to add programmed
ignition keys or to clear the transponder codes of lost
programmed ignition keys; it cannot start the engine. If
you try to start the engine with the learning key, it could
damage the immobilizer control unit.
The learning key is given to the customer, sealed in its
plastic case. Advise your customer that the learning
key is a tool for the dealer; it cannot start the engine.
Customers should keep the learning key sealed in its
plastic case and stored in a safe place.
MASTER KEY
(BLACK)
VALET KEY
(GRAY) LEARNING
KEY
(RED)
2 of 8 00-039
Immobilizer System Indicator
The immobilizer system indicator is on the instrument
panel. When you insert a programmed ignition key
(master or valet) into the ignition switch and turn the
switch to ON (II), the indicator comes on for
2 seconds. When you turn the ignition switch to
LOCK (0) and remove the key, the indicator blinks
for 5 seconds and then goes off.
If you insert a nonprogrammed ignition key into the
ignition switch, and you turn the switch to ON (II), the
indicator comes on for 2 seconds and then it starts to
blink. It keeps blinking until you turn the ignition switch
to LOCK (0). If you try to start the engine with a
nonprogrammed key, the engine cannot crank.
Immobilizer Receiver
The immobilizer receiver is inside the bezel around the
ignition switch. It is powered by the immobilizer control
unit, and uses electromagnetic induction to energize
the transponder in the key. The energized transponder
sends its ID code to the receiver, which then sends the
code to the immobilizer control unit. The immobilizer
receiver contains no logic circuitry; it does not need to
be rewritten when replaced.
Immobilizer Control Unit
The immobilizer control unit is below the dashboard
next to the steering column. It sends power to the
immobilizer receiver to energize the transponder in the
key. The immobilizer control unit gets the transponder
ID code from the receiver, and checks it against the
codes stored in its memory. If the code matches, the
immobilizer control unit energizes the starter cut relay
and sends a unique serial code to the ECM. But if the
transponder code does not match, no serial code is
sent and the starter cut relay is not energized.
Engine Control Module (ECM)
The ECM is an integral part of the immobilizer system.
When the ECM gets the unique serial code from the
immobilizer control unit, it communicates or
“handshakes� with the immobilizer control unit by
sending back its own unique serial code. If the serial
codes are mutually recognized during this handshaking
process, the ECM energizes the fuel supply system
and the ignition system so the engine can start.
CONSEQUENCES OF A LOST KEY
The programmed ignition keys and the learning key are
essential parts of the immobilizer system. If your
customer has lost one or both of these components,
the consequences could be costly. Here are some
typical situations you could encounter and the potential
consequences:
• Your customer has none of the programmed ignition
keys, but still has the learning key. The immobilizer
control unit must be replaced with the Immobilizer
Unit Set.
• Your customer has none of the programmed ignition
keys and no learning key. The immobilizer control
unit must be replaced with the Immobilizer Unit Set.
CR SE UI
CONTROL
/h
ph
MIUM
FUELONLY
TENANCE
QUIRED
IMMOBILIZER
SYSTEM
INDICATOR
IGNITION
SWITCH
KEY
(With built-in
transponder)
IMMOBILIZER
RECEIVER
IMMOBILIZER
CONTROL
UNIT
00-039 3 of 8
• Your customer has a programmed ignition key but no
learning key. You have limited ability to add ignition
keys (you can only use the Ilco Immobilizer Key
Code Duplicator), and you have no ability to clear
transponder codes of lost ignition keys from the
memory of the immobilizer control unit.
• You are replacing the ECM, and your customer has
a programmed ignition key but no learning key. You
need to also replace the immobilizer control unit.
ADDING PROGRAMMED IGNITION KEYS
This vehicle originally comes with three programmed
ignition keys (two master keys and one valet key). The
immobilizer control unit can store as many as five
transponder codes in its memory. Use one of the
procedures below to add programmed ignition keys.
Ilco Immobilizer Key Code Duplicator Method
If your customer wants an additional programmed
ignition key(s), use the Ilco Immobilizer Key Code
Duplicator with Ilco programmable key blanks (look for
a T5 stamped on the shank or molded into the grip).
The key code duplicator offers a low-cost, quick, and
convenient way to make a duplicate key from a
programmed ignition key. Refer to S/B 99-053, Ilco
Immobilizer Key Code Duplicator, for details.
Alternate HDS Method
If the key code duplicator is not available, use the HDS
with Honda key blanks instead. The HDS programs
(rewrites) the immobilizer control unit by clearing all
transponder codes from the memory of the immobilizer
control unit and then storing the transponder codes of
the keys that you choose to enter.
Preparation
To add a programmed ignition key(s) with the HDS,
you need these items:
• The learning key
• All available programmed ignition keys (master and
valet) for the vehicle (This includes any master or
valet keys with a T5 stamped on the shank or
molded into the grip. These are duplicate keys made
with the Ilco Immobilizer Key Code Duplicator.) If you
do not have at least one programmed ignition key,
you must replace the immobilizer control unit (see
“The immobilizer control unit is faulty� in the
CUSTOMER SITUATION AND REQUIRED ITEMS
CHART).
• Immobilizer Key blank (master), P/N 35113-S84-
A01, H/C 5435433 or P/N 35113-S84-A02, H/C
6344436
or
Immobilizer Key blank (valet), P/N 35114-S84-A01,
H/C 5435441 or P/N 35114-S84-A02, H/C 6344444
• Key code for the vehicle (if cutting by code)
• Suitable key cutter
• HDS with 1.006.004 or later software
NOTE: Make sure the setup and time are correct
before you use the HDS. Select the F12 key in the
upper right corner to get the Set-up Details screen.
Make sure Market: is set to USA. Select the time
display in the lower right corner to get the Date/Time
Properties pop-up window. Make sure the date and
time are correct. For details, refer to the Honda
Diagnostic System (HDS) Setup Instructions
listed under Tool Information in ISIS.
• 1st Password (Get this five-character code from the
iN VIN Status Inquiry display. This code is changed
yearly.)
• Ilco Immobilizer Key Code Duplicator (if T5 key
recoding is needed)
Procedure
1. Use an appropriate key blank and a suitable key
cutter to cut a new ignition key(s) (see S/B 88-012,
Cutting Keys With the Exacta Code Key Cutter).
2. Gather up the learning key, the newly cut ignition
key(s), and all of your customer’s programmed
ignition keys (master and valet) for the vehicle. Set
aside any T5 keys.
3. Stick a small piece of masking tape to the grip of
each programmed ignition key and each newly cut
key. Starting with the programmed ignition keys,
mark them as A, B, C, etc.
4. Connect the HDS to the 16P data link connector
(DLC).
5. Insert key A into the ignition switch, and turn the
switch to ON (II). Turn on the HDS.
6. At the screen prompts, enter the VIN and the
odometer reading, and then verify the correct date
and time.
7. From the System Selection Menu screen, select
IMMOBI.
8. From the Mode Menu screen, select Immobilizer
Setup.
9. From the Immobilizer Test Mode Menu screen,
select Delete or Add keys and Rewrite ECM.
10. From the Rewriting of immobilizer control unit
screen, select Begin to delete or add keys and
rewrite ECM.
11. From the Entry of Number of Keys screen, enter
the number of original keys (available programmed
ignition keys, not counting the learning key), and
then follow the screen prompts. When you are
finished, turn the ignition switch to LOCK (0), and
then turn off and disconnect the HDS.
12. T5 keys only: Start the engine with each of the T5
keys you set aside in step 2.
• If all of the T5 keys start the engine, the
transponder codes are already recognized by the
immobilizer control unit. Go to step 13.
4 of 8 00-039
• If any of the T5 keys do not start the engine, use
the key code duplicator to recode those keys to
the code of a programmed ignition key (see S/B
99-053, Ilco Immobilizer Key Code Duplicator).
Start the engine with each of the recoded keys to
make sure they all work. Then go to step 13.
13. Return the learning key to its plastic case, and give
it back to your customer along with all of the other
programmed ignition keys.
CLEARING TRANSPONDER CODES OF LOST
PROGRAMMED IGNITION KEYS
If your customer has lost one or more (but not all) of the
programmed ignition keys, you should rewrite the
immobilizer control unit with the HDS to prevent the
lost keys from starting the engine. The HDS clears the
transponder codes from the memory of the immobilizer
control unit and then stores the transponder codes of
your customer’s remaining programmed ignition keys.
This process, in effect, clears the codes of the lost
ignition keys so they could not start the engine.
Preparation
To clear the transponder codes of lost programmed
ignition keys, you need these items:
• The learning key
• All of your customer’s programmed ignition keys
(master and valet) for the vehicle (This includes any
master or valet keys with a T5 stamped on the shank
or molded into the grip. These are duplicate keys
made with the Ilco Immobilizer Key Code
Duplicator.)
• HDS with 1.006.004 or later software
NOTE: Make sure the setup and time are correct
before you use the HDS. Select the F12 key in the
upper right corner to get the Set-up Details screen.
Make sure Market: is set to USA. Select the time
display in the lower right corner to get the Date/Time
Properties pop-up window. Make sure the date and
time are correct. For details, refer to the Honda
Diagnostic System (HDS) Setup Instructions
listed under Tool Information in ISIS.
• 1st Password (Get this five-character code from the
iN VIN Status Inquiry display. This code is changed
yearly.)
• Ilco Immobilizer Key Code Duplicator (if T5 key
recoding is needed)
Procedure
1. Gather up the learning key and all of your
customer’s programmed ignition keys (master and
valet) for the vehicle. Set aside any T5 keys.
2. Connect the HDS to the 16P data link connector
(DLC).
3. Insert a programmed ignition key into the ignition
switch, and turn the switch to ON (II). Turn on the
HDS.
4. At the screen prompts, enter the VIN and the
odometer reading, and then verify the correct date
and time.
5. From the System Selection Menu screen, select
IMMOBI.
6. From the Mode Menu screen, select Immobilizer
Setup.
7. From the Immobilizer Test Mode Menu screen,
select Delete or Add keys and Rewrite ECM.
8. From the Rewriting of immobilizer control unit
screen, select Begin to delete or add keys and
rewrite ECM.
9. Follow the screen prompts. When you are finished,
turn the ignition switch to LOCK (0), and then turn
off and disconnect the HDS.
10. T5 keys only: Start the engine with each of the T5
keys you set aside in step 1.
• If all of the T5 keys start the engine, the
transponder codes are already recognized by the
immobilizer control unit. Go to step 11.
• If any of the T5 keys do not start the engine, use
the key code duplicator to recode those keys to
the code of a programmed ignition key (see S/B
99-053, Ilco Immobilizer Key Code Duplicator).
Start the engine with each of the recoded keys to
make sure they all work. Then go to step 11.
11. Return the learning key to its plastic case, and give
it back to your customer along with all of the other
programmed ignition keys.
STARTING THE ENGINE WITHOUT A
PROGRAMMED IGNITION KEY
If your customer is stranded because he or she has no
programmed ignition keys or a part of the immobilizer
system has failed, you can still start the engine using a
properly cut key blank and the Immobilizer Brake
Code.
This procedure is suited for situations where your
stranded customer either plans to drive the vehicle
directly to a Honda dealership for immobilizer system
repair or he or she has the other programmed ignition
keys at home and plans to drive there with no side
trips.
If your customer has lost his or her programmed
ignition keys, but has programmed ignition keys at
home, advise him or her to schedule an appointment to
have the immobilizer control unit rewritten for the
remaining ignition keys; this way the transponder
codes of the lost keys are cleared from the memory of
the immobilizer control unit. Refer to CLEARING
TRANSPONDER CODES OF LOST PROGRAMMED
IGNITION KEYS.
00-039 5 of 8
If your customer has lost all of the programmed ignition
keys, he or she will need to have the immobilizer
control unit replaced. Refer to REPLACING THE
IMMOBILIZER CONTROL UNIT.
Preparation
To start the engine without a programmed ignition key,
you need these items:
• Non-transponder key blank, P/N 35117-SM4-901,
H/C 4225462
• Key code for the vehicle
• Suitable key cutter
• Immobilizer Brake Code (This five-digit code is
available on the iN VIN Status Inquiry display.)
Procedure
1. Use a non-transponder key blank and a suitable
key cutter to cut a temporary ignition key (see S/B
88-012, Cutting Keys With the Exacta Code Key
Cutter).
2. Release the parking brake.
3. Insert the temporary key into the ignition switch.
4. Turn the ignition switch to ON (II).
5. Enter the first digit of the five-digit Immobilizer
Brake Code by setting and releasing the parking
brake that number of times, within 30 seconds.
For example, if the first digit is four, set and release
the parking brake four times.
6. Turn the ignition switch to LOCK (0). (This enters
the digit into the immobilizer control unit.)
7. Turn the ignition switch to ON (II), set and release
the parking brake the appropriate number of times,
and turn the ignition switch to LOCK (0) to enter the
second, the third, the fourth, and the fifth digits.
NOTE: When you turn the ignition switch to ON (II),
the immobilizer system indicator does not blink but
stays on. The immobilizer system indicator stays on
even when the ignition switch is turned to
LOCK (0).
8. After you enter the fifth digit, and turn the ignition
switch to LOCK (0), the immobilizer system
indicator blinks three times and then goes off. You
can now start the engine with the temporary key.
NOTE: This procedure is only a temporary fix.
When you start the engine with the temporary key,
the immobilizer system indicator comes on and
stays on while the engine is running. And when you
turn the ignition switch to LOCK (0), the indicator
does not blink five times as it normally would.
9. Start the engine within 10 minutes or you must
repeat this procedure entirely.
REPLACING THE IMMOBILIZER CONTROL UNIT
The immobilizer control unit must be replaced if it is
faulty, or if your customer has lost all of the
programmed ignition keys or the learning key. When
you replace the immobilizer control unit, you must
rewrite it with the HDS, or the engine cannot start. The
HDS stores the transponder codes from the
programmed ignition keys, transfers the codes to the
memory of the new immobilizer control unit, and then
instructs the immobilizer control unit and the ECM to
recognize the other’s unique serial code.
Preparation
To replace the immobilizer control unit, you need these
items:
• Immobilizer Unit Set (Kit contains an immobilizer
control unit, a master key blank, and a learning key
blank.)
• All of your customer’s old programmed ignition keys
(master and valet) for the vehicle (This includes any
master or valet keys with a T5 stamped on the shank
or molded into the grip. These are duplicate keys
made with the Ilco Immobilizer Key Code
Duplicator.0
NOTE: When the HDS refers to “original� keys, it
means the master key that comes with the new
immobilizer control unit. Your customer’s old ignition
keys would now be considered as “new� keys by the
new immobilizer control unit. To become
programmed ignition keys, you must add their
transponder codes to the memory of the new
immobilizer control unit.
• Key code for the vehicle (if cutting by code)
• Suitable key cutter
• HDS with 1.006.004 or later software
NOTE: Make sure the setup and time are correct
before you use the HDS. Select the F12 key in the
upper right corner to get the Set-up Details screen.
Make sure Market: is set to USA. Select the time
display in the lower right corner to get the Date/Time
Properties pop-up window. Make sure the date and
time are correct. For details, refer to the Honda
Diagnostic System (HDS) Setup Instructions
listed under Tool Information in ISIS.
• 1st Password (Get this five-character code from the
iN VIN Status Inquiry display. This code is changed
yearly.)
• Ilco Immobilizer Key Code Duplicator (if T5 key
recoding is needed)
Procedure
1. Replace the immobilizer control unit. Refer to page
23-200 of the 1997–99 Prelude Service Manual.
2. Use a suitable key cutter to cut the keys that come
in the kit (see S/B 88-012, Cutting Keys With the
Exacta Code Key Cutter).
6 of 8 00-039
3. Gather up all of your customer’s old programmed
ignition keys (master and valet) for the vehicle. Set
aside any T5 keys.
4. Connect the HDS to the 16P data link connector
(DLC).
5. Insert the master key you cut from the kit into the
ignition switch, and turn the ignition switch to
ON (II). Turn on the HDS.
6. At the screen prompts, enter the VIN and the
odometer reading, and then verify the correct date
and time.
7. From the System Selection Menu screen, select
IMMOBI.
8. From the Mode Menu screen, select Immobilizer
Setup.
9. From the Immobilizer Test Mode Menu screen,
select Replace Immobilizer Control Unit.
10. From the Replace Immobilizer Control Unit
screen, select Begin to register Keys in the new
Immobilizer Control Unit.
11. From the 1st Password screen, enter the PCM
Code, and then follow the screen prompts. Make
sure you use the learning key that comes with the
new immobilizer control unit. Save the learning key
from the old immobilizer control unit for warranty
purposes. When the process is complete, turn the
ignition switch to LOCK (0), and then turn off and
disconnect the HDS.
NOTE: When the HDS refers to “original� keys, it
means the master key that comes with the new
immobilizer control unit. Your customer’s old
ignition keys would now be considered as “new�
keys by the new immobilizer control unit. To
become programmed ignition keys, you must add
their transponder codes to the new immobilizer
control unit’s memory.
12. T5 keys only: Start the engine with each of the T5
keys you set aside in step 3.
• If all of the T5 keys start the engine, the
transponder codes are already recognized by the
immobilizer control unit. Go to step 13.
• If any of the T5 keys do not start the engine, use
the key code duplicator to recode those keys to
the code of a programmed ignition key (see S/B
99-053, Ilco Immobilizer Key Code Duplicator).
Start the engine with each of the recoded keys to
make sure they all work. Then go to step 13.
13. Return the learning key to its plastic case, and give
it back to your customer along with all of the other
programmed ignition keys.
REPLACING THE ECM
When you replace the ECM, you must also rewrite it
with the HDS. This instructs the new ECM and the
immobilizer control unit to recognize each other’s
unique serial code. If you fail to rewrite the new ECM,
the engine cannot start.
Preparation
To replace the ECM, you need these items:
• Replacement ECM
• One programmed ignition key (master, valet, T5) for
the vehicle
• HDS with 1.006.004 or later software
NOTE: Make sure the setup and time are correct
before you use the HDS. Select the F12 key in the
upper right corner to get the Set-up Details screen.
Make sure Market: is set to USA. Select the time
display in the lower right corner to get the Date/Time
Properties pop-up window. Make sure the date and
time are correct. For details, refer to the Honda
Diagnostic System (HDS) Setup Instructions
listed under Tool Information in ISIS.
• 1st Password (Get this five-character code from the
iN VIN Status Inquiry display. This code is changed
yearly.)
Procedure
1. Replace the ECM. Refer page 11-38 of the
1997–99 Prelude Service Manual.
2. Connect the HDS to the 16P data link connector
(DLC).
3. Insert the programmed ignition key into the ignition
switch, and turn the ignition switch to ON (II). Turn
on the HDS.
4. At the screen prompts, enter the VIN and the
odometer reading, and then verify the correct date
and time.
5. From the System Selection Menu screen, select
IMMOBI.
6. From the Mode Menu screen, select Immobilizer
Setup.
7. From the Immobilizer Test Mode Menu screen,
select Rewrite ECM.
8. From the Rewriting of ECM screen, select Begin
to rewrite the ECM.
9. From the 1st Password screen, enter the 1st
Password, and then follow the screen prompts.
10. Turn the ignition switch to LOCK (0), and then turn
off and disconnect the HDS.
00-039 7 of 8
11. Do the idle learn procedure:
• Make sure all electrical items (A/C, audio unit,
defogger, lights, etc.) are turned off, and then
start the engine.
• Let the engine reach its normal operating
temperature (the cooling fans cycle twice).
• Let the engine idle (throttle fully closed and with
all electrical items off) for 10 minutes.
SUBSTITUTING A KNOWN-GOOD ECM
Do this procedure if you need to use a known-good
ECM to test a vehicle. You can swap an ECM from a
donor vehicle without having to rewrite it to the vehicle
you are working on.
1. Use a non-transponder key blank, P/N 35117-SM4-
901, H/C 4225462, and a suitable key cutter to cut
a temporary ignition key for the vehicle you are
working on. Refer to S/B 88-012, Cutting Keys With
the Exacta Code Key Cutter.
2. Remove the ECM and the immobilizer control unit
from the vehicle you are working on. Write the VIN
on the ECM and the immobilizer control unit to
avoid confusing them with the known-good parts
from the donor vehicle.
3. Remove the known-good ECM and immobilizer
control unit from the donor vehicle, and install them
in the vehicle you are working on.
4. Tape the donor vehicle’s ignition key grip-to-grip to
the temporary ignition key. The immobilizer control
unit will recognize the transponder code from the
donor vehicle’s key, letting you start the engine with
the temporary key.
5. Do the needed tests on the vehicle you are working
on.
6. When you are finished, reinstall both ECMs and
immobilizer control units, and destroy the
temporary key.
TEMPORARY KEY
DONOR VEHICLE’S IGNITION KEY
(Tape to temporary key.)
8 of 8 00-039
CUSTOMER SITUATION AND REQUIRED ITEMS CHART
This chart lists the customer situations most commonly associated with the immobilizer system along with the
items needed to remedy each situation. If you need to repair the system, refer to the Body Electrical section of the
1997–99 Prelude Service Manual. If you need the HDS, make sure it is loaded with the latest software and the
setup for it is correct before you use it. If you are adding programmed ignition keys, clearing the transponder codes
of lost programmed ignition keys or replacing the immobilizer control unit, make sure you get all of your customer’s
vehicle keys (learning key, master and valet keys, and T5 keys), along with the key code for the vehicle (if
available).
Customer Situation Required Items
Your customer has at least one
programmed ignition key and the learning
key, but wants an additional key(s).
NOTE: If your customer has lost the
learning key, you must use the Ilco
Immobilizer Key Code Duplicator.
IIco Immobilizer Key Code Duplicator and Ilco programmable key blanks
(see S/B 99-053 for details)
OR
Immobilizer Key blank (master), P/N 35113-S84-A01, H/C 5435433 or 35113-
S84-A02, H/C 6344436
or
Immobilizer Key blank (valet), P/N 35114-S84-A01, H/C 5435441 or 35114-
S84-A02, H/C 6344444
Learning key and all programmed ignition keys (master, valet, T5)
Suitable key cutter and the key code for the vehicle (if cutting by code)
HDS and 1st Password
Your customer wants to clear the
transponder code of a lost programmed
ignition key.
Learning key and all programmed ignition keys (master, valet, T5)
HDS and 1st Password
Ilco Immobilizer Key Code Duplicator (to recode T5 keys if needed)
Your customer has lost all of the
programmed ignition keys or the learning
key.
Immobilizer Unit Set (refer to the parts catalog for P/N)
Suitable key cutter and the key code for the vehicle
HDS and 1st Password
Your customer accidentally inserted the
learning key into the ignition switch and,
shortly afterwards, inserted a programmed
ignition key.
Immobilizer Unit Set (refer to the parts catalog for P/N)
All programmed ignition keys (master, valet, T5)
Suitable key cutter and the key code for the vehicle (if cutting by code)
HDS and 1st Password
Ilco Immobilizer Key Code Duplicator (to recode T5 keys if needed)
The immobilizer control unit is faulty. Immobilizer Unit Set (refer to the parts catalog for P/N)
All programmed ignition keys (master, valet, T5)
Suitable key cutter and the key code for the vehicle (if cutting by code)
HDS and 1st Password
Ilco Immobilizer Key Code Duplicator (to recode T5 keys if needed)
The immobilizer receiver is faulty. Steering Lock Assembly (refer to the parts catalog for P/N)
The ECM is faulty. Replacement ECM (refer to the parts catalog for P/N)
One programmed ignition key (master, valet, T5)
HDS and 1st Password
The ignition key cylinder is faulty or
damaged.
Steering Lock Assembly (refer to the parts catalog for P/N)
OR
Key Cylinder Set (refer to the parts catalog for P/N)
NOTE: If you know how to rekey locks, order the Steering Lock Assembly, and
rekey the other locks to match. If you do not know how to rekey locks, order this
kit only if your customer does not insist on all the locks matching. If your
customer insists on all the locks matching, but you do not know how to rekey
locks, order the Key Cylinder Set.
One or more of these locks are damaged:
door(s), glove box, trunk, trunk release
handle, or rear seat trunk access.
Key Cylinder Set (refer to the parts catalog for P/N)
NOTE: Replace locks individually if you know how to rekey them; otherwise,
order the Key Cylinder Set.
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