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All Back lights not working!! Help! 07 C6 vert

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Old Jan 30, 2015 | 02:01 PM
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Default All Back lights not working!! Help! 07 C6 vert

As the title says, nothing in back is working, blinkers, brake, running, reverse, nothing. Can anyone with wiring diagrams take a look and see what is the common thread there. everything up front working as expected with the exception of front blinker doing fast blink because of back not working. I've tried hazard and alarm as well and the same is true. I've checked fuses reluctantly, because i know they are all different circuits, and they were all fine.. This seems to me to be a wiring harness issue but without diagrams I don't know where to go. Any help would be greatly appreciated.
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Old Jan 30, 2015 | 03:40 PM
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Originally Posted by Litofeit
As the title says, nothing in back is working, blinkers, brake, running, reverse, nothing. Can anyone with wiring diagrams take a look and see what is the common thread there. everything up front working as expected with the exception of front blinker doing fast blink because of back not working. I've tried hazard and alarm as well and the same is true. I've checked fuses reluctantly, because i know they are all different circuits, and they were all fine.. This seems to me to be a wiring harness issue but without diagrams I don't know where to go. Any help would be greatly appreciated.
The harness for all that stuff comes together in connector C455, which has 8 conductors and is black.

C455 is allegedly located "in the rear compartment, in the LR storage compartment by the folding top module." However, the harness drawing shows it behind the right rear storage compartment. I think "LR" is a typo.

The ground that runs through C455 is circuit #750 whose origin is G302, located "in the passenger compartment, on the right B-pillar behind trim panel." It appears to be down low, by the door sill.

Good luck
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Old Jan 30, 2015 | 09:56 PM
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This is a pic of the C455 connector located inside the rear facia. Remove a passenger side taillight to access. (This pic is rotated 90 degrees)


Edit: Doh! Forgot to mention that it is common for this connector to corrode inside and cause problems, especially in areas where the humidity is often high. Take it apart, clean well with contact cleaner and reassemble with dielectric grease packing.


Originally Posted by **** Jockey
Remove the outer tail light on the passenger side and look straight down.

This is the connector sitting on the post of the rear grounding point. Not sure why the pic is rotated counter-clock-wise.



Last edited by RicK T; Jan 30, 2015 at 10:01 PM. Reason: add comment
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Old Feb 1, 2015 | 08:08 AM
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Thanks very much to you both. I will work on it today and let you guys know how it goes. I appreciate the help.
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Old Feb 4, 2015 | 06:46 PM
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Default Thanks guys!!

Yep C455 was the culprit. Took the outside right tail light off and it's right down below it as the picture above depicts. You need a star driver to take off the tail light but it's only one screw at the top. Took C455 in hand and the rear lit up. Took it apart and there was a fair amount of typical salt air debris. Cleaned it up and, voila!!

Thanks so much guys for the help.
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Old Feb 4, 2015 | 07:00 PM
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Originally Posted by Litofeit
Yep C455 was the culprit. Took the outside right tail light off and it's right down below it as the picture above depicts. You need a star driver to take off the tail light but it's only one screw at the top. Took C455 in hand and the rear lit up. Took it apart and there was a fair amount of typical salt air debris. Cleaned it up and, voila!!

Thanks so much guys for the help.
Awesome that you found the issue. Rick, your the best!
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Old Feb 4, 2015 | 07:51 PM
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Originally Posted by Litofeit
Yep C455 was the culprit. Took the outside right tail light off and it's right down below it as the picture above depicts. You need a star driver to take off the tail light but it's only one screw at the top. Took C455 in hand and the rear lit up. Took it apart and there was a fair amount of typical salt air debris. Cleaned it up and, voila!!

Thanks so much guys for the help.
Great news! Glad it was that easy, relatively anyway.


Originally Posted by LV2TOUR
Rick, your the best!
Thank you for the kind words. I appreciate it.
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Old Feb 4, 2015 | 08:00 PM
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Better go by a lotto ticket!
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Old Jul 19, 2017 | 05:26 PM
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You guys are unreal. Who needs the stinkin factory?! Nice job.
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Old Feb 8, 2023 | 12:31 PM
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Default This happened to me yesterday!

I was so fortunate to find this thread because I was at a complete loss after dealing fuses and relays with no success.
My connectors didn't appear dirty or corroded but i treated them with the cleaner just to be sure. Everything is now working as it should!
An extra tip: I removed both taillights to get a better grip on that wiring harness. Old plastic doesn't like to be moved around very much.
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Old Nov 6, 2025 | 07:14 PM
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I sprayed the c455 connector right above my thumb, didn’t seem dirty but what is this connector right by my thumb can’t get it to separate and I’m having the same issue as op
I sprayed the c455 connector right above my thumb, didn’t seem dirty but what is this connector right by my thumb can’t get it to separate and I’m having the same issue as op
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