Right rear turn signal not working?

Tiny
BENGALYORK
  • MEMBER
  • 2014 CHEVROLET EXPRESS
  • 4.8L
  • V8
  • 2WD
  • AUTOMATIC
  • 350,000 MILES
I cannot figure out why only the right rear turn signal will not work. The brake and backup light are working fine, but when the signal is turned on it just flashes fast and works on just the front of the van. The left side is fine. I have already changed the taillight harness and put new bulbs in, but didn’t change anything.
Wednesday, January 15th, 2025 AT 5:44 PM

10 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 52,348 POSTS
Okay, first I would check the fuses (8) that run the system which goes through the BCM, (yellow wire) Here is the wiring diagrams that show you how the system works, and which fuses run it. I would check the BCM right run signal output at the PCM using a test light to make sure the BCM is working and then either find the brake in the wire or just run a new wire.

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

Here is the BCM location as well. Check out the images (below). Please let us know what happens.
Images (Click to make bigger)
Thumb
Thumb
Thumb
Thumb
Thumb
Was this
answer
helpful?
Yes
No
Thursday, January 16th, 2025 AT 10:12 AM
Tiny
BENGALYORK
  • MEMBER
  • 10 POSTS
Thank you I’ll try this today and get back with you.
Was this
answer
helpful?
Yes
No
Thursday, January 16th, 2025 AT 10:27 AM
Tiny
BENGALYORK
  • MEMBER
  • 10 POSTS
Okay, I tried all the fuses. I programmed a new BCM, and I’m getting the same problem. Broken wire is all I can think of now. I’m waiting on an open circuit tester to come so I can maybe trace down this right rear turn wire, Ken would you happen to have a wiring diagram from the under-hood fuse box too, so I can start after it. Thank you.
Was this
answer
helpful?
Yes
No
Thursday, January 16th, 2025 AT 4:49 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 52,348 POSTS
Did you test the output of the BCM (yellow wire) to see if it blinks? I would test right at the BCM if it blinks run a new wire. Do you need more diagrams besides the ones I have for you in the above images?
Was this
answer
helpful?
Yes
No
Friday, January 17th, 2025 AT 11:50 AM
Tiny
BENGALYORK
  • MEMBER
  • 10 POSTS
I’ll try that then as soon as I get back to the van, so for the right rear turn it should be the yellow or dark green out of BCM. Thank you
Was this
answer
helpful?
Yes
No
Saturday, January 18th, 2025 AT 9:32 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 52,348 POSTS
Oopps, yep, my bad, sorry, dr/grn wire. Let me know and have a nice weekend.
Was this
answer
helpful?
Yes
No
Saturday, January 18th, 2025 AT 10:35 AM
Tiny
BENGALYORK
  • MEMBER
  • 10 POSTS
You too sir, thanks again.
Was this
answer
helpful?
Yes
No
Saturday, January 18th, 2025 AT 11:12 AM
Tiny
BENGALYORK
  • MEMBER
  • 10 POSTS
Okay, finally got to get back to the van, I couldn’t get any current out of the dark green wire coming out of BCM. I used an open circuit tester from the right rear harness to turn wire and couldn’t find any breaks in the wire. Where should I go next? Thank you
Was this
answer
helpful?
Yes
No
Sunday, January 26th, 2025 AT 1:12 PM
Tiny
BENGALYORK
  • MEMBER
  • 10 POSTS
Found it Ken it was the BCM 6 fuse! Thank you for your help.
Was this
answer
helpful?
Yes
No
Sunday, January 26th, 2025 AT 2:41 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 52,348 POSTS
Glad you could get it fixed, thanks for letting us know. Please use 2CarPros anytime we are here to help.
Was this
answer
helpful?
Yes
No
+1
Monday, January 27th, 2025 AT 9:34 AM

Please login or register to post a reply.

Related Turn Signal Not Working Content

Turn Signal Problems
GUIDE
Turn Signal Problems
Turn sig­nals are in­tended to help in­form sur­round­ing dri­vers of the ve­hi­cle's in­tended change in di­rec­tion. Al­though there are a few dif­fer­ent causes for sig­nal fail­ure...
VIEW MORE