04 sport trac- dead power lock button.

[Chargerjay]

Hey Guys, so, I've tried going thru the forums and find lots of info but each thread is a bit different and none seem to be what I'm looking for. So here's my issue; neither the driver's door lock button, or the passenger door lock button work. The unlock works on both, and the keyfob and key pad both work to lock doors. I have pulled the door panel off a few hundred times, well not really, but more than a few times. Gone through every spec of wire in that door. I made a jumper and could not jump the locks to lock them but could jump to unlock. So ima thinking there's nothing at the switch. Now I've gone through that joyous harness in the door frame and found and fixed 5 broken wires, no change. I've hunted for the relay to no avail, and put a gallon or two of penetrating oil down the latch assembly, the usual things. So what I'm thinking is where ever the passenger's door, and driver's door lock wires connect is a great place to check. Any help or EMTs are muchly appreciated, I've been working on this truck for almost a year and this is the last thing to do.

 

[Fix4Dirt]

it should be attatched below. Thanks J_C!!! hopefully this helps, as I'm not 100% sure on the issue, maybe the wiring in door has been pinched? never had this before. could be the master door switches, as iirc someone else had an issue wit that recently

 

[Chargerjay]

Hey Fix4Dirt, thanks a ton for the schmatic, it's going to take time but I'm going to go through it and trace wires until I find the problem. I have been through the door jam boot and fixed every broken wire there. What makes sense to me is that somewhere between where the driver's door lock button and passenger door lock button wiring splice together is the problem area. Neither doors lock button works, but unlock and keyfob lock button works fine, as does the outside security panel. So it has to be the lock buttons are not getting power and because it's both doors it makes sense they splice together and the power supply to that splice has a problem, as neither lock button circuit in door button only, has power. My other thought was that the unlock side of the switch does have power, I jumped the circuit, so is it reasonable to think that I could supply power to the lock button from the unlock button? As long as it gets power to activate the actuator I don't see why it would cause a problem. I know I will have to trace the wiring to fix it properly, but as a temp fix this sounds like it should work to me. Any comments are appreciated. Also, thanks again for the schmatic, it's going to make a unpleasant job more bearable.

 

[Fix4Dirt]

no problem!! actually, thank J_C, hes the one who found all the diagrams!!! hope it all work sout!