Andrew

Please help confirm my thinking about how to fix a strange problem my 04 c5z began having with hyperflash turn signals and headlight popping up.

All turn signal bulbs are good and do not have LEDs. Sometimes, when using the turn signal, I get hyperflash. The rear blinks fast then the front will not blink. I can push the hazard switch and it cycles correct and temporarily gets the turn signals working again. This seems to be a common issue for many. However, sometimes when hyperflash happens, the headlights will pop up. Push the hazard switch and the hyperflash stops and the headlights go down. Push the hazard switch turn the hazards off and the headlights pop up again. After cycling the hazard switch a few more times to stop the signal hyperflashing, headlights drop as normal. Once hyperflash starts, headlights pop up again. Can almost raise and lower the headlights with the hazard switch. Also, once hyperflash begins, the headlight switch will not raise or lower the headlights until hyperflas stops.

So, what's the fix?

jdmvette

All signs seem to be pointing toward your hazard switch...I'd start there

Andrew

That is my suspicion as well. Is the headlight pop up deal also a symptom?

Andrew

If anyone experiences hyperflash and random headlight popping up, the LED resister harness fixes the issue without removing and replacing the hazard switch. Works like stock, woohoo!!