Running taillights not working

2011 CHEVROLET IMPALA
200,000 MILES • V6 • 2WD • AUTOMATIC
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FASHUNKILLA
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  • 2 POSTS
The brake lights work fine, the backup lights work fine. It's just the taillights and the trunk/3rd light that doesn't . I changed the bulbs and the fuses. I'm not sure where to go next. Could it be the wiring harness or like a relay or something ? Please help!
Sep 16, 2020 at 6:56 PM
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JACOBANDNICKOLAS
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 110,190 POSTS
Hi,

Is it only the rear parking lamps? Do the front ones turn on?

I attached a pic from the wiring schematic below. I circled two fuses and a relay. Here is the issue. I need to conform that not only the fuses are good, but there is power to the fuses when the lights are turned on.

If there is no power to the fuses with the lights on, the relay is likely the problem. Now for the bad news, the PCB on the relay stands for printed circuit board. It isn't repairable. There are other things that can cause this as well. For example a faulty switch, the body control module and so on.

However, do what I suggested first so we can eliminate the easier things. If we need to dig deeper, we can do that as well.

Let me know.
Joe
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Sep 16, 2020 at 7:10 PM
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FASHUNKILLA
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Thanks Joe, and yes the front parking lights work fine just the rear. Is that the fuse box under the hood ?
Sep 17, 2020 at 7:47 PM
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JACOBANDNICKOLAS
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 110,190 POSTS
Hi,

Yes, the wiring schematic is the box under the hood. Have you had a chance to check?

Let me know.

Joe
Sep 18, 2020 at 8:45 PM