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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 29534
Experience:  GM Grand Master Technician 2007. 14 years experience.
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Chevrolet C3500 HD: , I have a 2004 chevy 3500 6.6. The

Customer Question

Hello, I have a 2004 chevy 3500 6.6. The Dr rear window switch shorted out and as a result, there are no back lighting in everything but the radio and dash message board. The tcm a2 fuse is good.
Submitted: 2 years ago.
Category: Chevy
Expert:  GM Tech (Cam) replied 2 years ago.
Hi there, I am Cam. Can I get your first name please? DO you have outside back lights?
Customer: replied 2 years ago.
My name is tristan. I do have outside back lights.
Expert:  GM Tech (Cam) replied 2 years ago.
There are several fuses in both fuse blocks for good causes. Have you checked all of them?
Customer: replied 2 years ago.
Multiple times so far, they're all good.
Expert:  GM Tech (Cam) replied 2 years ago.
Do you have a test light? If so can you do some testing at the body control module? It's under the dash directly below the steering column. In the 6 pin connector on the left side, see if the brown wire gets power with the lights on.
Customer: replied 2 years ago.
No power on the brown wire
Expert:  GM Tech (Cam) replied 2 years ago.
There are 3 orange wires, 2 in the clear or white connector with 6 pins and another in the 6 pin black connector. dO they have power all the time?
Customer: replied 2 years ago.
There is no power on the 3 orange wires from the clear 6 pin nor the orange wire in the black 6 pin.
Expert:  GM Tech (Cam) replied 2 years ago.
Is your tester working properly? For all three to be out is very off.
Customer: replied 2 years ago.
It's working fine, tested the connection in the wire harness before and during use.
Expert:  GM Tech (Cam) replied 2 years ago.
OK, check the TBC 2A 2B and 2C in the left dash fuse block. IF those are good and do not have power, check the LBEC ! 50 amp square fuse in the underhood fuse block.
Customer: replied 2 years ago.
The 2a, 2b, and 2c fuses are good and have power. Also checked the LBEC and MBEC fuses with an ohm meter.
Expert:  GM Tech (Cam) replied 2 years ago.
That means your Body Control Module (BCM) is faulty then and will need replacement and programming.