2004 Silverado door unlock problem

[popster]

HELP!!!

I have a 2004 Silverado, 4X4, crewcab with fairly standard accessories. I have a confusing door unlock problem. I installed aftermarket mirrors to get extension for seeing around a camper. I tested everything before putting the door panels on. Passenger door no problem. When I put the driver door panel on the unlock button quits working. I have leaned the panel out, everything works, put it back in place and doesn't work. It is not binding the door lock because the unlock works from the manual slider and the keyfob. when it doesn't work, the passenger side button doesn't work either. I have looked at the factory drawings and on this model, it appears that the door lock/Window/mirror control assembly is actually a small computer on each door and talks with the body computer via a 2 wire serial link. I have made it happen with the door panel off once by wiggling the harness in the door near the larger speaker but haven't been able to find the spot yet since a lot of the harness moves when I wiggle. I have checked the connectors to the switch, and plugged and unplugged them several times and checked to see that nothing is pressing against the switch. I will note that mine is the YE9 silverado and the circuit is different from the Non-YE9 according to the factory schematic and doesn't have the relays at the fuse box. that have gone bad in other trucks. The only thing I can think of is that some sort of wiring problem is interupting the serial link when the unlock button is pushed. The lock, mirror and windows work just fine at all times. If it were only the driver door the problem would be easier, but when it malfunctions both doors won't unlock unless the keyfob is pressed or the manual slider used. Only brightside is that I am getting really good at removing the door panel and switch. It now takes less than 1 minute to do both. Practice, practice!

 

I am getting frustrated. Has anyone had a problem like this or have any ideas what to try? I will appreciate any help at all. I have thought about buying a total new harness but am not sure that would fix it