Hello,

I'm having problems with my 2003 Trailblazer LS. This all seemed to happen at once. Here are the problems I'm noticing:

The rear lift gate and window won't lock
The rear wiper doesn't turn on
My key fob doesn't work anymore
The interior lights and radio don't stay on when I turn the vehicle off

Let me know if you have an idea of what is going on.
Thank you all,
Ian

 

The rear door has a BCM located behind the door panel, should look like a black box. can't miss it is the only one there. That's what is wrong. You can get one from the scrape yards from a donor. Needless to say you will need to reprogram your key fobs to the new BCM. Body control module. And maybe just wires are loose.

 

Check wires coming from top of hatch wires could be cut inside of rubber protector between body and hatch.