91 s10 blazer door lock relays

If your truck doesn't have a factory keyless entry, then your door locks are a 5 wire polarity reversal system which doesn't use a relay.sparky

now i don't want to say sparkie is wrong, but maybe he's a little mistaken. on my '92 s15 jimmy, the power door lock are wired into a relay assm. the truck was not ordered with a factory keyless entry system but it does have the relay. the GM part # i have is 12065122. i did install an aftermarket alarm system in my jimmy and the doors do lock/unlock with the remote, you just nees to trace the wires and install a couple of 4/5 pin relays- one to lock, one to unlock. all this can be done right bellow the dash near your kick pannel/ parking brake pedal area. just remember to wire everything INSIDE your truck , not inside the vent area.i had someone bring their truck to me to fix because it was unlocking doors all by it's self, at any given time. the run-off from the rain gutter drains down between your fender and the outer vent wall, thus getting the wiring/relays wet and shorting them out. good luck with the install.noreplacement4displacement