Rear brake/turn signals not working

Tiny
JC DUBOIS
  • MEMBER
  • 2007 CHEVROLET UPLANDER
  • 3.9L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 127,546 MILES
I have vehicle listed above that has had an ongoing issue with the rear turn/brake lights. The tail lights do work in normal running mode, turning on with the headlights. However, neither the turn signal, nor the brake light comes on when triggered on either side.

The front turn signals do flash as normal when using the turn signal switch and the hazard lights.

I have replaced (more than once) the bulbs on both sides, as well as replaced fuse 12, which is indicated as the turn signal/brake signal fuse in the manual.

In the past, I've seen the driver's side briefly fail to work for two to three days, before starting to work again for no apparent reason. It would happen, and then things would be fine for months. However, most recently the driver's side went out and stayed out for three days, and then the passenger's side also went out; neither side has started working again since (two weeks, at this point).

I have a suspicion that the issue might be wiring related, as at least a couple of times smacking the panel over the driver's rear wheel seemed to stop the issue, and would love to find some sort of guide or diagram for getting in there to inspect the wiring to see if I can locate a break, but any advice would be welcome.
Do you
have the same problem?
Yes
No
Saturday, February 9th, 2019 AT 1:03 PM

1 Reply

Tiny
JOE F
  • EXPERT
Hi and thanks for using 2CarPros.

If you want to determine if there is a wiring issue, do this. Locate the body control module to the left of the steering column mounted under the dash. Check for power to the pins indicated in the attached picture. One wire is yellow and the other dark green. Just use a test light to see if the test light flashes with signals or stays on with brakes.

Here are a couple links that may be helpful:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

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

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

If you haven't already, check the light green wires at the lights for power. See picture 2.

Let me know if this helps or if you have other questions.

Joe
Was this
answer
helpful?
Yes
No
Saturday, February 9th, 2019 AT 7:39 PM

Please login or register to post a reply.

Sponsored links