1990 Ford Bronco II Door lock/unlock relay
All three automatic door locks on a 1990 Bronco II will unlock when the unlock
switch is depressed on the driver's side door. However, none of the locks will
lock when the lock switch is depressed. I assume that there is a lock and
unlock relay based upon the problem and that the lock relay needs to be
replaced. Can you advise where that relay is located.
Sounds like a bad switch or possibly a loose lead to the switch.
Yes, try the other switch. If the locks work correctly from the other switch the problem is with the first switch or the wiring going to it! Hope that helps! Jim
Can anyone actually answer the question and post a photo of the relay for power door locks. I'm trying to wire in an alarm and attached to pink yellow and pink green or which ever they said and they are both ground which will blow up the alarm. so there must be a spot after the relays they say are behing headlight on driver side but I cant find any relay 89 bronco II
I do not believe that it is a bad switch because both the passenger and driver side switches are working the same way. Each will open the locks, but neither will close the locks. Because of this and due to the fact that this is a new problem, one day; I presumed that it must be related to a point that both switches (passenger and driver) have in common (perhaps a relay) . I just do not know where the relay is. Perhaps I have described the problem a little better than I did initially.
Thanks for the additional information! Your new alarm system is probably designed for a newer vehicle that has some kind of keyless entry system from the factory. On one of those systems you have two unlock wires for the power lock system and one lock wire. This is because with a newer system pressing the unlock button on a keyless entry fob of a newer vehicle unlocks the driver's door only. Pressing the button twice unlocks all the doors. Your Bronco wasn't equipped with this kind of power lock system from the factory. You can lock or unlock all the doors from any power lock switch and that's it. There's no relay or computer involved. Just good old fashioned switches, wires, and actuators. That's it! I suspect the alarm system won't work with your vehicle because of the age of the vehicle! I'd suggest contacting the manufacturer of the alarm system and see what they say. Hope that helps! Jim
Rockauto.com shows this as a power lock relay. Everyone else shows it as a power window and HVAC relay. It's Standard Motor Products part number RL2. Hope that helps! Jim
ok guys Id appreciate an answe fromr someone that really knows and is not throwing out guesses. It can be done but I'm trying to determine if the 89 Bronco II is a positive or negative pulse door lock. From what I see when you hit the lock it goes from ground to power and sends power to either lock or unlock. That being said all I need to know is how to wire in a relay that allows power to go through as normal when you use the door locks on the car and on pulse sends power dircetly to the lock or unlock power for the system. It seems like the fact the switch maybe breaks a ground and switches to power that I may be missing something. I just want to emulate the switch sending power and perhaps creating a ground when the alarm sends the pulse signal to the relay. Just not sure if I need one or two relays for pulse or how the hell this system works on the truck as it exists from factory thanks
have to run 2 relays
im having the same exact problem on my 1990 bronco.... this is as far as I've gotten so far I believe this is how it works but I'm not sure if you need to run a ground from 87a so you still maintain the ground after you hit your lock or unlock button
but i do believe that it needs to be grounded but still trying to figure it out.... can any electrical guys out there tell me if this is right
im having the same exact problem on my 1990 ford bronco.... there is no relay as far as i know..... we have to put the relays in the lock loop so it works just like the switch but i havent quite got it yet... im think we have to run the lock and unlock wires from the new controller to a relay coil so it will switch your 12v to the lock/unlock wires just like our switch does when you push lock or unlock ... the only thing im not sure about is if we need to ground the NC 87a on the relay but im pretty sure about the rest ... but i was also thinking i need to put the relays on the two black wires on the left side
Guru6SLLK hope that hepled you if i get any further ill let you know
