Turn Signals Inop
Thread Starter
Cruising
Joined: Oct 2023
Posts: 11
Likes: 1
From: Virginia
Turn Signals Inop
Hey guys. I am not great at disgnosing electrical issues and I am hoping to find some leads.
I recently installed those laser DRL housings. They worked great for months but now my turn signal switch is not working. The lights function, the hazards work. However, my turn signal switch is dead. No green arrows in dash or changes in lights on exterior when the switch is engaged.
I have checked the fuses and cleaned my engine bay grounds. Again, hazards work and so do my DRLs. My signal is the only thing not working.
What should I check next? My coworker recommends checking flasher relays in the dash but I wanted to ask the forum prior.
Let me know what else you guys recommend.
Thanks!
I recently installed those laser DRL housings. They worked great for months but now my turn signal switch is not working. The lights function, the hazards work. However, my turn signal switch is dead. No green arrows in dash or changes in lights on exterior when the switch is engaged.
I have checked the fuses and cleaned my engine bay grounds. Again, hazards work and so do my DRLs. My signal is the only thing not working.
What should I check next? My coworker recommends checking flasher relays in the dash but I wanted to ask the forum prior.
Let me know what else you guys recommend.
Thanks!
Safety Car
Joined: Jan 2012
Posts: 3,956
Likes: 520
From: Da U.P.
Could be the flasher switch, could be the multifunction switch. Mine are inop too. I'm not interested in firing the parts cannon, would prefer to narrow it down in a more orderly fashion but I've yet to find a suitable schematic to assist with that.
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Safety Car
Joined: Mar 2017
Posts: 3,771
Likes: 940
From: Orlando Florida
The GM part is no longer available, but aftermarkets aren't all bad and are quite affordable -- $25 on both Rock and Amazon. I tend toward Standard Motor Parts (SMP) and away from Dorman, as do many.
C5Diag has provided wiring diagrams and troubleshooting tips on several turn signal and stop light threads in the last year. A search of those terms should yield relevant posts. That said, the preponderance have been a mix of hazard switches and multifunction switches -- more hazards as I recall.
I haven't tried it yet, but the connection under the driver's knee pad, where a hazard bypass harness can be plugged in, certainly appears to be the same connector as the hazard switch. I'm thinking that one could pull the knee pad, disconnect the connector -- it's a short harness connecting the main harness to the switch in the dash -- and connect an alternate hazard switch. If it works, you have verified the problem.
Unfortunately, the hazard switch isn't the only thing GM has stopped producing. The multifunction switch is no longer available, and that's from both GM and the aftermarket.
C5Diag has provided wiring diagrams and troubleshooting tips on several turn signal and stop light threads in the last year. A search of those terms should yield relevant posts. That said, the preponderance have been a mix of hazard switches and multifunction switches -- more hazards as I recall.
I haven't tried it yet, but the connection under the driver's knee pad, where a hazard bypass harness can be plugged in, certainly appears to be the same connector as the hazard switch. I'm thinking that one could pull the knee pad, disconnect the connector -- it's a short harness connecting the main harness to the switch in the dash -- and connect an alternate hazard switch. If it works, you have verified the problem.
Unfortunately, the hazard switch isn't the only thing GM has stopped producing. The multifunction switch is no longer available, and that's from both GM and the aftermarket.
Pro
Joined: Oct 2006
Posts: 515
Likes: 133
Safety Car
Joined: Jan 2012
Posts: 3,956
Likes: 520
From: Da U.P.
I found schematics, they're useless. They start with arbitrary signals from the multifunction switch and hazard switch with no indication of how the power flows through them. Irrelevant here though, I found both the approach and hazard (previously fine) both blown. Replaced, went for a test drive, and they're still working so I'll have to keep an eye on that. It at least points me in the right direction next time it/they blow.
Thread Starter
Cruising
Joined: Oct 2023
Posts: 11
Likes: 1
From: Virginia
did you ever find a solution?
Safety Car
Joined: Jan 2012
Posts: 3,956
Likes: 520
From: Da U.P.
Thread Starter
Cruising
Joined: Oct 2023
Posts: 11
Likes: 1
From: Virginia
nice. let me know if you can remember. Just got this thing back on the road after replacing the clutch. Ill let you know too
Safety Car
Joined: Jan 2012
Posts: 3,956
Likes: 520
From: Da U.P.
Safety Car
Joined: Jan 2012
Posts: 3,956
Likes: 520
From: Da U.P.
There are 3 ways to fire the blinkers: via the multifunction switch, via the hazard switch, or via the BCM (when DRLs are on, but this requires a signal from MF switch to initiate). Since your hazards work then according to the schematic your flasher is good to go. The only component I could see causing your malfunction (no blinkers, yes hazards, yes DRLs) is the MF switch. Of course it's possible there's some weird wiring problem too, but if it were my money I'd be probing both sides of that MF switch to verify it.
Heel & Toe
Joined: Nov 2022
Posts: 21
Likes: 18
I just did this yesterday too. This is my second time. I bought a new hazard switch. That is the easy fix. (Go under the kick plate under the steering wheel - hemostat the front to pullnot through)method That wasn't it. Took out second hyperflash bypass... boom signals work. They hyperflash but they work.
Good luck in your repair.
Good luck in your repair.