Brake lights and turn signals not working?

SNIPEREYZ

MEMBER
CHEVROLET COBALT

05 Chevy Cobalt 33K miles 2.2/ I just noticed this morning that my driver side rear turn signal does not work at all, and the front flashes faster than normal. The right side is fine. Neither of the rear brake lights come on when I hit the brakes, but the one on the trunk does. I have checked the bulbs and they seem fine. I also looked at the fuses, none seem damaged. Please give feedback!

1 Reply

KASEKENNY

MECHANIC
18,907 POSTS

There are a number of things that can cause this, but the most likely cause is a bulb issue. However, this may be a ground issue or even a connector issue so here is a guide that will get us started on this:

https://www.2carpros.com/articles/turn-signals-blink-rapidly

Also, here is a guide that will walk you through how to test the voltage at the lamp which is the next step:

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-use-a-voltmeter

I am attaching the wiring diagrams below which will provide the entire exterior lighting system info so please run through this and let me know what questions you have or what you find with this, and we can go from there.

Thanks

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