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I think what you are describing is the central locking device. I used to have a 92 Accord that did not have one. How did I know? When I unlock my drivers door I still have to hit the unlock button from the inside to unlock all 4 doors. The following generation was a bit smarter with a CLD, if you held the key in the door in the unlock position all of the doors would unlock at the same time. My 95 Prelude is the same way.
Chances are an aftermarket unit was installed, and perhaps taken out again later. If it had been a keyless entry dealer upgrade, they probably would have opted for repair instead of removal.
The good news is, if you wanted to install keyless entry you won't have to install a central locking device, just wire to the exsisting one. Now where is that thing anyway?
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