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Old Sep 12, 2024 | 06:54 AM
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Default Hazard lights

I have a problem with the rear hazard lights in C5.

When I turn on hazard lights, the rear lights don't work, the front hazard lights only work. Turn signals lights work normally, front and rear.

Have any of you had such a problem?
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Old Sep 12, 2024 | 10:51 AM
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Are they the stock bulbs or have you changed them to LED?
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Old Sep 12, 2024 | 10:58 AM
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Originally Posted by ztheusa
Are they the stock bulbs or have you changed them to LED?
I replaced it with LED with a resistor.
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Old Sep 12, 2024 | 11:11 AM
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You will need to install a hyper-flash harness.

https://www.ebay.com/itm/31484970217...3FNZ27HWETHVFS
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Old Sep 12, 2024 | 12:35 PM
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A hyperflash harness will NOT fix this problem. It only helps with normal signals flashing too fast.

It's the hazard switch. It has a bunch of contacts that switch the lights from the normal function to the hazard flashing and something has gone wrong inside it.
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Old Sep 12, 2024 | 02:40 PM
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Originally Posted by ztheusa
You will need to install a hyper-flash harness.

https://www.ebay.com/itm/31484970217...3FNZ27HWETHVFS
I thought about hyper flash, but I have LEDs and resistors, I thought it was not necessary.

The turn signals do not flash too fast.
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Old Sep 12, 2024 | 02:45 PM
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Originally Posted by lionelhutz
A hyperflash harness will NOT fix this problem. It only helps with normal signals flashing too fast.

It's the hazard switch. It has a bunch of contacts that switch the lights from the normal function to the hazard flashing and something has gone wrong inside it.
I bought a hazard switch on Amazon, a replacement from China, and unfortunately it's the same, the rear doesn't work, and extra the turn signals flash a little faster.

Maybe I got it damaged?
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Old Sep 12, 2024 | 04:12 PM
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So, the brake lights don't work then?

Have you got Euro style tail lights?
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Old Sep 12, 2024 | 05:07 PM
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The rear lights do not work, but only in the hazard warning mode. When turn on hazard lights the front lights signals flash.
When I turn on the turn signals, they work both front and rear. Problem is only hazard lights and only rear lights.

Yes, I have the lights converted to the euro version. The stop is separated from the turn signals. I did it by disconnecting the famous and well-known white wire under the steering wheel. Then only the brake light in the middle lights up and the rest of the brake lamps are powered from it.
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Old Sep 23, 2024 | 12:38 PM
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Could be the hazard switch or the MFS then. The brown wire from the hazard switch to the MFS could also be the problem.
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Old Sep 23, 2024 | 02:00 PM
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With safety being a top priority, it is important your rear hazard lights are operating properly. Our team wants the opportunity to learn more about this and investigate ways we can assist. When you get the chance, please send us an email to socialmedia@gm.com. Be sure to include your Username and Forum name in the subject line, then provide additional details about your experience in the body of the email. We look forward to your contact.
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Old Sep 24, 2024 | 04:29 PM
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If you have not done so already, please send us an email at socialmedia@gm.com so our team can assist with your rear hazard lights. We will look out for your contact.
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Old Sep 25, 2024 | 04:18 PM
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We're only an email away at socialmedia@gm.com if you'd like assistance with this. Our team is always here to help.
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Old Oct 7, 2024 | 09:13 AM
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Originally Posted by lionelhutz
Could be the hazard switch or the MFS then. The brown wire from the hazard switch to the MFS could also be the problem.
I changed the hazard warning light switch and it was the same. Maybe it's actually something MFS, I'll look into it.
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Old Oct 7, 2024 | 09:14 AM
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Originally Posted by Chevy Cust Svc
With safety being a top priority, it is important your rear hazard lights are operating properly. Our team wants the opportunity to learn more about this and investigate ways we can assist. When you get the chance, please send us an email to socialmedia@gm.com. Be sure to include your Username and Forum name in the subject line, then provide additional details about your experience in the body of the email. We look forward to your contact.
I will contact you by e-mail.
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Old May 27, 2025 | 05:57 AM
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Originally Posted by Adamo
The rear lights do not work, but only in the hazard warning mode. When turn on hazard lights the front lights signals flash.
When I turn on the turn signals, they work both front and rear. Problem is only hazard lights and only rear lights.

Yes, I have the lights converted to the euro version. The stop is separated from the turn signals. I did it by disconnecting the famous and well-known white wire under the steering wheel. Then only the brake light in the middle lights up and the rest of the brake lamps are powered from it.

I'm coming back to this topic because I have a problem with the lights. I have modified the lights on the Euro version, I cut the safety white wire. The problem is that I also lost the rear hazard warning lights. The rest of the lights work perfectly fine. Maybe I cut the wrong white wire. Can you tell me which one to cut?
Thanks in advance and greetings from Europe.

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Old May 27, 2025 | 12:31 PM
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When one function stops working after a modification or change has been made, I like to undo the modifications until everything is working normally again. I would start backtracking your changes (perhaps starting with reconnecting the white wire) until your hazards, turn signals, and brake/tail lights are working normally. That way you will know what change made the hazards stop working.
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Old May 27, 2025 | 01:40 PM
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That's what I did. I returned to its original state. Only now I have a direction indicator connected to the feet.
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Old May 27, 2025 | 01:49 PM
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Originally Posted by Adamo
...........Only now I have a direction indicator connected to the feet.
I'm sorry, I don't understand that statement, something must have been lost in the translation.
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Old May 27, 2025 | 02:00 PM
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I did just as you wrote, I returned to its original state.Only now I have again direction indicators associated with the STOP light, as it is in the original. I want the STOP signal separate from the direction indicators. I took the STOP signal from the middle STOP lamp.
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