[ChevyGuy]

I believe the switch is part of the door lock mechanism. At least it seems to be that way for the rear doors. Odd, but with the rear doors people have reported problems of "false open", not "false closed" like you are. Which makes me wonder if the harness isn't shorted. (Or maybe the driver's door works differently.)

 

[ChevyGuy]

The problem with this is the new latch has to be programmed for the BCM to recognize it.......obviously a dealer will be involved at some point.

Eh? I'm missing something here. AFAIK, it's just a switch, not a module.

 

[ChevyGuy]

View attachment 195585

Interesting. The door switch doesn't feed the BCM directly, but the window switch module. If the module has gone bad, then you may need to get a dealer involved.

 

[ChevyGuy]

**U1534 (K9 Body Control Module) LIN Bus 3 Lost Communication With Device 4 (M74D Window Motor - Driver).**

Uh, what was replaced? The switch itself is just a switch. But it connects to a module. I'm assuming you've replaced just the switch - which does not require reprogramming. But if the module was replaced, that could be a different story.

The code indicates that communication was lost to the module that drives/controls the window motor. That can happen if the mechanic disconnected the module. And guess what - that module is "live" 24/7. If he didn't disconnect the battery first, I'd expect that code to be there. But it should go into history once the module was reconnected.

I'd suggest disconnecting the battery and letting it sit awhile. Then reconnecting it. That should reboot the system. If that doesn't work, have the mechanic double-check that the module is still connected. I'm sure it's easy to accidentally pull a wire while working in the area.

 

[ChevyGuy]

I mentioned the need for programming in post#4.

Why the surprise?

I was under the understanding that the latch is just a pair of dry contacts. I think it connects to the window switch module. Replacing that would be a different deal. So I'm confused on why replacing just the latch/latch switch would require reprogramming. Is it needed to clear the error?