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My '99 does this intermittently. On most cars, the hyperflash is intended to tell you one a lamp has burned out. I'm hoping it's a grounding issue, and that if I clean the correct ground point the problem will be eliminated.
They started working again and then stopped so it's intermittent. Any ideas?
If all your bulbs are OEM, not LEDs, and they are fine because you just replaced them, and when you installed the new bulbs you inspected the sockets and they are fine as well, not corroded or burned, then most likely the problem is either the MFS or the Hazard Switch.
If it were only one side, then it would probably be the multifunction switch (MFS).
When the problem is affecting both sides, then it's probably the Hazard Switch going bad. In a C5 the turn signal and hazard functions are provided by the hazard switch.
You can replace the hazard switch, but a Hyperflash Harness should fix your problem and is easier to install. As an added bonus, it will allow you to install LEDs in the future with no hyperflashing.
A hyperflash harness replaces the portion of the hazard switch that handles the turn signals with a flasher that's LED friendly. Hazards will still hyperflash because that function remains untouched in the OEM hazard switch.
Checkthis one out. It's completely plug-and-play: no splicing or anything.
If all your bulbs are OEM, not LEDs, and they are fine because you just replaced them, and when you installed the new bulbs you inspected the sockets and they are fine as well, not corroded or burned, then most likely the problem is either the MFS or the Hazard Switch.
If it were only one side, then it would probably be the multifunction switch (MFS).
When the problem is affecting both sides, then it's probably the Hazard Switch going bad. In a C5 the turn signal and hazard functions are provided by the hazard switch.
You can replace the hazard switch, but a Hyperflash Harness should fix your problem and is easier to install. As an added bonus, it will allow you to install LEDs in the future with no hyperflashing.
A hyperflash harness replaces the portion of the hazard switch that handles the turn signals with a flasher that's LED friendly. Hazards will still hyperflash because that function remains untouched in the OEM hazard switch.
Checkthis one out. It's completely plug-and-play: no splicing or anything.
Thank you for the detailed response. Hard to tell if it’s the multifunction switch or the hazard problem. They seem to both go bad together but I’ve also had times where 1 was working. I think I’ll start with the hyper-flash harness and see if that resolves the problem.
I also have the right turn signal not lighting up in the dash. Do you know the fix for that?
Any luck with replacing the hyperflash harness? As of a couple of days ago, my hazard lights periodically pulse fast and/or just stop AND I the 4 main brake lights are inoperative. What needs to be done to install hyperflash harness and/or hazard switch? Which ground (and location) controls the hazard and brake lights?
Thanks
in for the response for install as I changed to LED Blinkers and I am having Hyperflash issues and want to know what is all involved in solving this issue
...What needs to be done to install hyperflash harness...
Originally Posted by Khaalathas
in for the response for install as I changed to LED Blinkers and I am having Hyperflash issues and want to know what is all involved in solving this issue
It's fast and simple. You just need to remove the driver's knee bolster to have better access. The connectors you need to separate from each other, in order to insert the hyperflash harness in-between, are right there by the steering column.
Connectors should be directly below the ignition key switch:
Hyperflash Problem
