Front turn signals don't work...
Thread Starter
Safety Car
Joined: Aug 2004
Posts: 4,899
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Front turn signals don't work...
My two front turn signals don't work however the parking lamps both light up still...the bulbs are not shot ( i checked each one ) Anyone know where to start the diagnosis? 
Race Director
Joined: Apr 2007
Posts: 11,152
Likes: 890
From: South Western Ontario
Does the turn indicator in the dash work? This can narrow the problem down.
Do the daytime running lights work? The DRL's use the turn signal bulb filaments.
Look at the first diagram. The signal power comes from the B triangle and goes in terminal B8, through a relay and then out terminal C9 to the light bulb. If the signal indicator in the dash works then the problem has to be in that part of the wiring harness.
Something that has always puzzled me is why these cars just don't use the DRL relay to control the front signals...
Peter
Do the daytime running lights work? The DRL's use the turn signal bulb filaments.
Look at the first diagram. The signal power comes from the B triangle and goes in terminal B8, through a relay and then out terminal C9 to the light bulb. If the signal indicator in the dash works then the problem has to be in that part of the wiring harness.
Something that has always puzzled me is why these cars just don't use the DRL relay to control the front signals...
Peter
Race Director
Joined: May 2005
Posts: 15,960
Likes: 21
From: West Norriton PA
St. Jude Donor '08
See if you're getting a signal out of "B" or "C" by using a test light when the signal switch is on.
If so, your multi-function switch is working if not, that's your problem.
The next place to check would be at connector C146 which is located next to your battery and see if you're getting a signal there.
If not it's probably your hazard switch.
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Pro
Joined: Apr 2008
Posts: 628
Likes: 4
From: Columbia SC
Some people have reported that if actuating your hazard switch several times with more or less vigor (don't hit it too hard) temporarily restores turn-signal function, then you know the hazard switch needs replacing. I understand that then you can either replace the hazard switch with another GM or do an upgrade with an aftermarket harness arrangement (forum has the info on this).
3rd Gear
Joined: Apr 2021
Posts: 3
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Which connector is c146 by the battery? I'm having a similar issue and have power coming out of both b and c terminals from the multifunction switch. trying to narrow it down to see where I have power and where I don't but there's like 6 or 7 connectors by the battery. thanks an advance for any and all help.
