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No rear turn signals or brake lights

Tiny
DUHDUH72
  • MEMBER
  • 2007 CHEVROLET IMPALA
  • 3.5L
  • 6 CYL
  • 130,000 MILES
My brake lights and rear turn signals stop working, the middle light works fine. I replaced the multi-function switch with a Delco switch but that did not fix it. Where else might I look?
Sunday, June 24th, 2018 AT 7:40 AM

8 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,904 POSTS
Hello,

There is a tail light relay #27 that needs to be checked. Here is a guide and the location of the relay along with the wiring diagrams so you can see how the system works:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.

Cheers, Ken
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Monday, June 25th, 2018 AT 12:49 PM
Tiny
DUHDUH72
  • MEMBER
  • 5 POSTS
Thanks Ken, I will check it out this evening or in the morning then I will let you know. Judging by what I read on the internet this seems to be a pretty common problem so I am sure there are others that can use the same help.
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Monday, June 25th, 2018 AT 1:36 PM
Tiny
DUHDUH72
  • MEMBER
  • 5 POSTS
Ken, I check this out and I found that the number in your attachment for the fuse panel cover is 13523182 and the number inside of my fuse panel cover is 13596729- 01. Do you have the same information available for this fuse box because I do not find a number 27?
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Tuesday, June 26th, 2018 AT 9:59 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,904 POSTS
It is a relay in the fuse box #17 which is in the upper left hand corner. Does your PDC have a relay in that position?
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Tuesday, June 26th, 2018 AT 11:02 AM
Tiny
DUHDUH72
  • MEMBER
  • 5 POSTS
I do not see a relay.
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Tuesday, June 26th, 2018 AT 11:07 AM
Tiny
KEN L
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Sorry had the wrong diagram I update the post above. You can see the park/tail/relay below the fuel pump relay.
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Tuesday, June 26th, 2018 AT 11:37 AM
Tiny
DUHDUH72
  • MEMBER
  • 5 POSTS
Please view the my PDC cover diagram. I replaced the relay at #17 position with no positive results.
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Wednesday, June 27th, 2018 AT 6:11 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,904 POSTS
Okay, next let's test through the turn signal switch use the wiring diagrams above and this guide.

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

If the switch is okay then it sounds like the BCM is out. Please check all fuses on the BCM as well. Here is the location. Please check all wiring

Check out the diagrams (below). Please run some tests and get back to us.

Cheers, Ken
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Wednesday, June 27th, 2018 AT 12:50 PM

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