Yes this unit is almost complete, though you'd probably missing the power transistor and blower motor high relay and the rest of the parts for the heater valve, also the complete wiring harness would probably be useless other than for the connectors but from what he wrote all the sensors already come with all the plugs and a few inches of wires
does yours blow air yet? i hooked mine up according to your writeup today, the recirc motor and rear defrost work ok, but i can't get it to blow air. actually, i didn't hook up all of the mode control motor wires because there were a couple that were the same color and i couldn't decide which to splice into. i think it was the blue/red and the yellow/green wires on the usdm harness that had 2 of each of those colors. is there any way i can test with the multimeter for which wire i need?
the BLU/RED that's in the corner of the connector on the side that has only 3 wires is the No. 1 wire don't use that one for the mode control motor, use the one that's on the opposite end of the connector, for the YEL/GRN use the No. 16 wire, it'S in the opposite corner of the No. 1
Mine doesn't blow air yet, I was waiting for a part from the scrap yard but they sent me the wrong one and when I called back they said they didn't have one so I'll have to find one somewhere else, my car is going to get painted next week, so I won't be able to continue working on this but I'll try to find the parts and when I get my car back I'll be able to hook that up and I'll update my write-up
yeah, i would have gone by the pinouts on the connector but i snipped it off before i started anyway, I was looking in the helms and it seems that the fan control wires are on the 5-wire usdm harness. i'm assuming these will have to hook up to some wires on the jdm harness. are you going off of a schematic for matching these wires or are you just testing each one? it would be really helpful to have a schematic for the jdm harnesses.
if you have any other info on what wires to hook up i'd be interested in hearing it.. maybe i can let you know if they work. I already cut my harness so I'm pretty much without a climate control until i get it hooked up
ouch... I should have said in my write up to cut the wires one by one as you connect them, it makes things easier
There's quite some changes in the blower control wiring first of all you need the blower motor high relay and a power transistor (these are 2 parts I don't have right now but I'll be ordering soon), the biggest problem will be finding connectors for those, I'm gonna try a fog light sub-harness for the relay but for the transistor I guess I'll have to solder to wires to it. You won't be using the 5 wires connector at all. I'll try to add the blower control in my write up sometime this weekend.
Well I just updated my write-up with the blower control wiring, please note that I haven't test it out yet though since I don't have all the parts yet, I'll test it out when my car will be back from the body shop cause I'll probably have the parts by then. If somebody tries it let me know.
thanks for updating the writeup.. btw, wouldn't it be possible to just use an ordinary transistor and relay for the blower circuit? they can't be that much different from the ones you buy at radioshack, especially the relay.
For the relay I plan on using a Prelude fog light relay so I can get the sub harness to connect it, but I guess as long as the relay is 12V it should be ok. For the transistor I have no idea how they mesure that or anything so I'm gonna use one from an Acura CL or at from another Honda/Acura to be on the safe side. Also for the transistor the thing is it goes in the blower unit (I guess it's only so it doesn't get too hot or something like that)
just got back from the junk yard.. luckily they had a 97 cl with all of the interior still intact. i managed to pick up a few things:
outside temp sensor
inside temp sensor
sunlight sensor
power transistor
i opened it up and it looks like its pretty much just a regular transistor with a big heatsink and a capacitor wired in there.
i also swiped a few relays
and a moonroof switch, just because mine is worn down and this one said ////Alpine on the back
I guess what I need now is the air mix control motor, heater valve, and the evaporator sensor. I could have got that last sensor today but i felt sorry for the guy having to take the whole dash out and the evaporator was way in there. I'll probably go back next week to pick it up.. I've got a few parts to keep me busy in the meantime.
oh yeah, and one more thing. in the writeup it says to splice into the blu/red wire connected to the blower motor. i just wanted to clarify that this is the same wire as the blu/red wire on the 5-wire usdm harness going to the climate control. i'll probably attempt to connect the blower motor tonight and let everyone know how it goes.
Nice your lucky you have a scrap yard that had a CL in your area, last friday I tried going to one of the biggest (if not the biggest) scrap yard around here but couldn't even find where it is... one thing I noticed though, do you have the connector for the transistor assembly?
Also yes the wire is the same it's just it splits in 2 somewhere in the harness, one goes right before it splits in 3-4 before the blower resistor and the other goes directly to the 5 wire connector on the USDM climate control unit.
For the heater valve I don't think you'll be able to find on on the 97 CL, I'm still trying to find from which car I could get one... I guess next time I go to my Acura dealer I'll ask them to popup a few hoods
ok.. I just hooked up all the wires for the blower motor. turned the ignition and air began to blow immediately. changing the fan setting did nothing, it was on full power all the time. after about 10 seconds, i noticed some smoke coming from underneath the control unit and so i shut everything off. i then disconnected the transistor and relay for the blower and turned it back on, the control unit seems to work like it did before. so, hopefully nothing was damaged.
i hooked it up according to forbidden's writeup and wiring diagram for the blower. the one thing i did different was i did not connect wires 1 to 3 in the diagram, because that section looked a little vague in the pic. so, wire 1 should connect to wire 3 and not wire 2 right? i also couldn't tell which way to look at the transistor when hooking it up, but i figured i could try out both configurations to see which one worked. after i noticed that i couldn't change the fan speed, i swapped the positions and that's when the smoke started coming out.
who knows, maybe the transistor is just not compatible?
The black dots are where there's a connection between the wires, wire 3 is not connected to wire 2, for the transistor I just figured out there's a side on these, I just changed that out in my diagram.
I still don't understand how transistor works, but I would tend to believe that the one from the CL is compatible with the JDM climate control since it's 12V on both car, the reason you couldn't control th blower might have been cause you didn't connect the wire 1 and 3 together (I didn't really put the numbers for the wires in the diagram, they were there for the end of the wire like where to hook up that wire). Also you must've had the transistor hooked up the right way the first time, that might be why you saw smoke when you wired it the other way...
I hope your unit is still working correctly... if there's something else that's not clear let me know
thanks for the help.. i'll try rewiring it again tomorrow, i'm just a little more cautious now of burning something you know. I spliced into the blk/yel wire near the recirc control motor like you suggested, but for the blu/red wire i just connected it up at the 5p harness. maybe i should just bypass the resistors somehow?
anyway, is it just me or is this turning into a 2-person thread?
I'm thoroughly impressed and just about as far confused...been considering trying this mod, but the more info dropped here, the more nervous I get.
Don't think I have the knowledge necessary to try this, might read a few books first (I like to learn before I break thinkgs) & then try to get all the parts. Go pre, if I can get all the necessary parts, you trying to assist with the install....come on...I'll get you a six pack...
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Originally posted by go pre thanks for the help.. i'll try rewiring it again tomorrow, i'm just a little more cautious now of burning something you know. I spliced into the blk/yel wire near the recirc control motor like you suggested, but for the blu/red wire i just connected it up at the 5p harness. maybe i should just bypass the resistors somehow?
anyway, is it just me or is this turning into a 2-person thread?
anyone else got some info to share?
Did you keep the blower resistor box? If so remove it, you don't use it on the JDM climate control, that's why there's a transistor, it replaces it. I don't think it matters where you connect the transistor on the BLU/RED wire but I guess if you could hook it up before where the wire splice in 2, it would be better...
Yeah it's almost been you and I for quite a while, I guess there are people waiting 'til it's finish to get the info on how to install it from us
I don't see how someone could make an adapter to make it plug and play, since there's a bit more than just swapping connectors... I guess once we have it fully functionnal, we'll be able to tell you how to do it without frying your ECU
Yes with a front clip everything should be there, it would still not be plug and play but you'd have all the parts you need that harness you have to splice the wire into is the main harness, it goes into the engine bay and all the way under the dash from one side to the other
ok.. I just tried wiring the blower motor again and still no luck. fan just turns on full blast and won't change speeds. i removed the connector from the blower resistor, and i patched wires 1 and 3 together. so, I'm really at a loss for what to try next. is there a way i can test the fan speed wire on the control unit with my multimeter to make sure it's still working?
If the fan turns on at full blast it means you're close to having it working. Probably a wire not connected correctly or something like that. Have you grounded the #6 wire? Check the diagram I made and make sure every place there's a dot the wire are connected and where the wires end on my diagram it means it goes to a wire you already have in your car.
I just played around with it a little more and noticed a few things. i have the transistor hooked up in the first configuration that i tried and it doesn't smoke anymore, so that's good. once i was sure it wasn't going to burn up, i started playing with it.
it seems now that i can get 2 speeds, which are equivalent to full blast and a step down from that. when i press the fan button to increase the speed to full (4 bars) on the display, the relay will click about a second after i press the button, and then the fan speed increases to full blast. when I press the button again, the speed immediately goes back down 1 step (although it shows only 1 bar on the display) and i can hear the relay click immediately as well. so, to avoid confusion, the actual fan speed is around level 3 when the display shows 1,2,or 3 bars, and the actual speed is 4 when the display shows 4 bars.
i dont' know much about electrical stuff but it seems like one of the components isn't working correctly. even when i press the off button on the control unit the fan still blows at speed 3.
My guess is that the transistor is not hooked up the right way... ok when you look at the top of the transistor with the single connector on top, the single connector is for the BLU/RED wire the one on the left would be the #5 wire and the one on the right would be the #6 (ground) wire.
Anybody got a picture of a JDM Climate Control unit at night? I think I have a few LED or bulb or whatever what's inside it that doesn't work...
Wow reading this makes me very confused, good job on the play by play Forbidden, question for you, I have a couple JDM prelude front clips sitting around, what would I need to take out of these ludes to have the JDM climate control working? Since I do have everything that came from the JDM lude will this make the install easier, do I follow with the JDM wiring? Or is it totally different? Sorry for all the questions. I never have really thought about doing this but after reading your thread is doesnt seem as difficult as I thought it would be, also will this be easier since I have no A/c sorry for all the questions but you have got me thinking now of adding something kool to my car! -Nick
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If you have access to a front clip you should have all the parts you need in there, I've updated my write-up and included where the parts are located on the JDM Prelude. If you can, take the wiring that goes from the back of the climate control and follow the wires as long as you can, but there are wires that goes almost everywhere in the car and the harness they are in is the main harness. If you can't have all the wiring you need just cut it a few inches after the connector so you can splice the wires and try to get a few inches of the wires after the connectors for the sensors and all other parts too. It won't really be easier to do even if you have all JDM parts but you won't have to search for parts if you can have all the parts you need. The hardest part will be to adapt the air-mix control motor on your heater blower. As for A/C it won't make thing harder or easier to do if you don't have if since it's only a single wire.
I just read up a little bit on transistors and relays, and tested the voltages on the wires in this circuit for the fan blower:
this was without the transistor hooked up, just the relay:
#2 wire is getting slightly over 12v, #4 is getting around 12v, #3 is getting 12 volts, and wire 5 is getting no voltage.
From what I understand of how a transistor works, wire #5 connects to the base of the transistor and will have an effect on the voltage going to #6, the emitter. so, theoretically the fan speed should be controlled by the voltage going through wire 5 from the control unit, but I'm not getting any voltage on that wire at any of the fan settings.
so, either my control unit is busted or it's the wrong wire. forbidden, can you please double check your diagrams again and make sure it's the WHT/BLU wire on the jdm 16p harness?
Originally posted by go pre oh yeah and here is a pic of the control unit at night..
i think i might have a bulb burnt out though too, because my defrost symbol doesn't light up.
You should have, as you said, the defrost button illuminated. Also, the blue and red arrows for the temp 'up - down' should light up as should the windshield symbol and the recirculate button below that.
But, on my car, the text that reads 'A/C ON', 'FAN' and 'MODE' don't illuminate on my car and I wasn't sure if they should or are even meant to!? That said, they are not buttons like the defrost and recirc., but the white text is printed on like the blue and red arrows and they illuminate...
Originally posted by go pre I just read up a little bit on transistors and relays, and tested the voltages on the wires in this circuit for the fan blower:
this was without the transistor hooked up, just the relay:
#2 wire is getting slightly over 12v, #4 is getting around 12v, #3 is getting 12 volts, and wire 5 is getting no voltage.
From what I understand of how a transistor works, wire #5 connects to the base of the transistor and will have an effect on the voltage going to #6, the emitter. so, theoretically the fan speed should be controlled by the voltage going through wire 5 from the control unit, but I'm not getting any voltage on that wire at any of the fan settings.
so, either my control unit is busted or it's the wrong wire. forbidden, can you please double check your diagrams again and make sure it's the WHT/BLU wire on the jdm 16p harness?
Yes I just checked again and the #5 wire that goes to the transistor base goes to the No. 9 wire (WHT/BLU) on the JDM 16 pin connector
this just gets more and more confusing. when i had the transistor hooked up and measured the voltages, i had 0.5v and 1.9v on wire #5 for the 2 different operating fan speeds. anyone here an electrical engineer?
So you had 0.5V and 1.9V at different fan speed settings? And the other settings didn't change the fan speed? What kind of voltage did you get for the other settings?
wire #5 was 1.9v for the first 3 fan settings, then on the 4th setting, the relay clicked and it went down to around 0.5v. then, when i went back to speed setting 1, it returned to 1.9v.
can you post the jdm wiring diagram if you have it? that might help me to figure out what's going on and how the transistor is supposed to work.
Sorry I didn't reply earlier I was gonna reply this morning but my drive for work arrived and I had to leave, I'll try to scan the diagrams I have here tomorrow
My car is at the body shop right now so I can't work on it right now but I'm gonna make a few calls tomorrow or friday for some parts to continue working on it when I get my car back but it went pretty well 'til now
thanks for posting the diagrams.. i'm a little confused as to what type of transistor it is because in the jdm diagram it looks like the emitter is pointing towards the base (it's hard to tell though), which would make it PNP, but in the diagram you drew you have the emitter pointing away indicating it would be NPN. can you verify which kind it is? I just picked up a PNP transistor from radio shack and I'm going to replace the other one as long as it's the right kind.
yeah it's a bit hard to see on the scan but it's not pointing at the base and it's the same symbol as the one on the CL diagram so it's the same type of transistor as the CL
I just picked up another control unit off of ebay, and it came with the sensors and entire heater box so I should have close to all of the parts when it gets here. I'm still not sure if my other unit is bad but I guess I'll know when the new one gets here. forbidden.. when are you getting your car back from the shop? I should get these parts in early next week so I'll have some more info to share then.
Yeah I believe I saw that unit on ebay, it is probably missing the blower high relay and power transistor but you already have those. And also it's probably missing the rest of the system for the water valve.
My car should be ready early this week, probably tuesday or wednesday
Sorry if I bring back an old thread but I prefer to have everything in a single thread over 5-6 threads for the same subject, makes it easier for people when they'll search on this.
It's already been over a month since I've had the chance to work on the Climate Control, the power transistor took like 2 weeks to get here and I didn't knew how much of a pain it is to order relays from my local Honda dealer so I ordered the fog light relay and subharness from hap.com and it took like 3 weeks to get here, when I opened the box there was only the relay cause the subharness had been discontinued... if I had knew before I would've bought a relay at a scrap yard or something...
Well I hooked up my blower motor and now I have a big mess of wire under the passenger side of the dash but the blower works!! I tried all speed and everything was fine! That blower spins really fast when you hold it in your hand The only thing is that since I didn't have the real connectors for the power transistor and the relay, I had to be a little creative and use connectors for each pin of the transistor and the relay. I'm gonna use a glue gun to make sure the connectors are stuck in place. It's gonna be a permanent connector but after it'll be done I don't think I'll want to remove it
Originally posted by Forbidden red: Sweet indeed! at least if I don't finish it up soon I'll still be able to set the temp manually from under the dash and not freeze this winter
prelude2005: If it was plug and play where would be the fun of having it?
BTW I love those pics in your sig, how the hell do you keep you car clean like that?
thanks man, zaino works...some good stuff for the 4th gen luders.
btw, can you like get pics, draw out wiring (MS paint is fine) and list what all relays, plugs, wires, or anything else you need?
I think I have most of that stuff in my write up already, I have more pics but they are still in the cam, I'll have to get them out and I'll put them on the page as well
DAMN, i live in Northern VA, and had a full JDM bb4 front clip just sitting there with all these parts! I wish I belonged to preludeonline before i burned the entire dash and everything up! oh well still have the climate control like forbidden started out with, taht was the easiest thing to take!
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Brandon
Captain - my other car has two engines
1993 Prelude Si (JDM H22A with automatic to 5spd Swap) My white 93 Vtec
AIM: Mach30SiR
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anyway, I was looking in the helms and it seems that the fan control wires are on the 5-wire usdm harness. i'm assuming these will have to hook up to some wires on the jdm harness. are you going off of a schematic for matching these wires or are you just testing each one? it would be really helpful to have a schematic for the jdm harnesses.
anyone here an electrical engineer?
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