all running lights not working?

2003 CHEVROLET IMPALA
12,000 MILES • 3.4L
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DAVID CHEN
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  • 16 POSTS
Turn on the headlight switch either by Auto or by manual, both headlights are okay but all of running lights are not working.
Jun 13, 2023 at 3:24 PM
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STRAILER
  • Experienced Mechanic
  • 55,249 POSTS
The first thing we need to do is check the fuses, this guide should help, and I have included this how to guide so you can see what to do.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Here are the running light wiring diagrams so you can see which fuses to check and how the system works. Also, if the fuses are all good there is a running light relay, I would swap out which should fix the problem.

Please check out this guide as well:

https://www.2carpros.com/articles/no-tail-lights-exterior-running-lights-tail-lights-out

Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.
Jun 14, 2023 at 5:10 AM
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DAVID CHEN
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Thank you very much for your wonderful instructions. According to the running light wiring diagrams which you send to me, I have use the test light and a multimeter to checks all fusses/grounding/continuity, have found the parking lp relay malfunction , I swapped this relay with back up lp relay (identical), it was confirmed which the park lp relay defected. The new relay was installed an hour ago. All running lights are working perfectly. Thank you, a lot, with the best regards.
Jun 14, 2023 at 12:21 PM
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STRAILER
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Thanks for letting us know, we are here to help, please use 2CarPros anytime. Can you please leave us a rating? (copy entire link)

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https://www.sitejabber.com/reviews/2carpros.com

Thank you.
Jun 15, 2023 at 5:33 AM
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