Driver side master lock switch does not lock the doors.

[Explorer_PL]

I can not lock the doors using the driver side master lock. I thought that maybe the switch is shot, I had a spare in my garage, replaced it and the same story (both switches unlock all the doors). So I thought maybe both switches are defective, so I used the master switch from the passenger door that locks and unlocks all the doors, but same thing. I searched on the web and most people have this issue when the harness going from the door to the car gets broken somewhere. I found out also that the switches in the doors serve as a ground for the lock relays. I unplugged again the switch and grounded the purple/yellow wire and it unlocked the doors. Then I grounded the grey/yellow and nothing happened on the driver side. I tested it on the passenger side and grounding them lock and unlocks the car. So now I am out to trace where the grey/yellow is broken. I found it in between the door and the car, ground it there and it did not do anything. After that it's bad. The harness enters the car above the parking brake and it's very tight in there.


Can someone post a wiring diagram for the locks ?

I need to run some ground and jump it to the broken one.

Thanks

 

[Scorpion8]

Can someone post a wiring diagram for the locks ?

https://www.dropbox.com/s/2cal7d73ga9o19t/va228261.pdf

Hope this helps.

 

[Explorer_PL]

Thanks Scorpion

That's what I needed. I hope it's not the SJB.

 

[Explorer_PL]

Hi all -

I am so happy now I have been dealing with strange electrical issues for the past few years. All the diagnostics were pointing to SJB, and I just could not shell out $ 700 for it. First, my reading interior lights stopped working. I could put them all on with the dimmer wheel, but if my kids wanted to have lights just in the back, they could not. Then, out of nowhere my truck got possessed. It would unlock itself randomly, or kept unlocking every 30 seconds or so. Again, everything pointed to the SJB and that the "door all unlock" relay being stuck. So I designed a relay box that tapped into the #6 fuse, and would cut out the power anytime the car was off. It was not perfect but it worked. Now, few days ago, the unlock button on my driver door stopped working. I did all the stuff I described above, and again I was going to jump a wire from the passenger side switch that worked to my driver side so I have a functioning lock switch. As I was looking for the harness and my "open lock" wire, I located it on the passenger side, tapped into it, and then I pulled the carpet on the driver side. As I was doing it the locks started to lock and unlock itself like craze. What I found was this. When I bought the truck in 2007, I had a alarm place install the remote starter. I did not realized that they had to tap into the lock, and unlock, and also (do not know why) interior lights. They did it in the worse locations possible, but probably the easiest for them. They cut the wires and just used cold crimps and placed the whole harness back in the space in the floor pan. Over time, melting snow from my shoes, rain and all the moisture collected right there, and all these 3 wires just fall apart. So next time you have something like that, look thru all the new connections. I did not think my remote starter was the issue because I disconnected it when I was testing the mysterious unlocking and that did not help. In my case, the 2 wires from lock/unlock function need just ground to activate the door actuators, and that was what they were doing thru the water and moisture under the carper.

 

[Scorpion8]

I am so happy now

Yay! Glad to hear.

 

[Explorer_PL]

Scorpion, thanks for the diagram.

I love the feeling when things are back to normal on the truck, and things behave as expected.