The brake lights and rear turn signals do not work?

2007 CHEVROLET MALIBU

220,000 MILES • 4 CYL • 2WD • AUTOMATIC

DRANMA

MEMBER
6 POSTS
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The brake lights and rear turn signals don't work but the middle brake light works, the front blinkers blink fast. The taillights work, and the reverse lights work. I changed the bulbs and still don't work. they went out different times. I need to know what is going on.

Dec 17, 2023 at 4:11 PM

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STRAILER

CAR REPAIR CONTRIBUTOR
54,189 POSTS

These lights are controlled by the BCM which sounds like it is going out, but we should check the grounds for the light in the rear lights G403 which is located at the left rear of the rear compartment. If this ground is off, loosened, or broken it will cause the problem you have described.

This guide can help you see what I am talking about:

https://www.2carpros.com/articles/brake-lights-not-working

and

https://www.2carpros.com/articles/turn-signals-not-working-blinker

If the ground is okay here are the wiring diagrams for the brake and turn signals and I have included how to change the BCM out, you can get a preprogrammed unit by searching Google or Ebay.

Also, a CAN scan could produce a trouble code for the BCM which will help us confirm the problem. You can get a CAN scanner (Controller Area Network) which will work on most cars from Amazon.

Here is a video to show you how:

https://youtu.be/u-4syLc-ifQ

Check out the images (below). Please let us know what happens.

Images (Click to enlarge)

Dec 18, 2023 at 11:35 AM