Head light pop o[ issue.
Thread Starter
Intermediate
Joined: Mar 2009
Posts: 34
Likes: 0
From: Glasgow KY
Head light pop o[ issue.
(99 Corvette) When I turn the headlight switch on sometimes the headlight do not com up or on. After 2, 3 or a few more tries, the come up. Before I go replacing a $250 turning signal arm and headlight switch, is there something I should check?
Instructor
Joined: Apr 2011
Posts: 161
Likes: 14
From: Florida
Yeah you need to do a quick search on here before anything else. Very doubtful it's the headlight switch based on my own experience.
Pro
Joined: Nov 2009
Posts: 606
Likes: 18
From: burke va
I just replaced the turn signal/headlight switch to try and fix the exact problem that you describe.(except that my lights would come on but not pop up) It did not fix the problem. Pretty sure it is the "headlight control module". If I had read the other posts on this subject more carefully I would have known that if the headlights come on but do not pop up it is probably not the turn signal switch. If you find that you need to replace the turn signal arm an A/C Delco can be bought for $150-$180 if you shop around.
Last edited by egrand333; Mar 26, 2012 at 07:47 AM.
Le Mans Master
Joined: Sep 2010
Posts: 5,520
Likes: 5
From: Long Island NY
Do you have HID's installed or are the headlights stock?
Tech Contributor
Joined: Dec 2003
Posts: 19,384
Likes: 87
From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
The guys are correct. Troubleshooting headlight problems can be guesswork without being able to put a DMM on the car. The T/S switch, hazard switch or headlight modules are the normal problems.
I have the troubleshooting guide. PM me with your e mail if you'd like a copy.
I have the troubleshooting guide. PM me with your e mail if you'd like a copy.
Tech Contributor
Joined: Dec 2003
Posts: 19,384
Likes: 87
From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
Working through the guide using your symptoms it comes up with this:
Are the headlamp doors closed at all times? YES
1. Remove the right hand headlamp assembly.
2. Disconnect the control module connectors C1 and C2 to the actuator for the headlamp opening door.
3. Turn the headlamps ON.
4. Connect a test lamp between the headlamps ON input circuit and a known good ground at connector C1.
Does the test lamp illuminate?
Yes or No?
Yes:
Inspect the harness connector for headlamp opening door actuator control module for a poor connection.
No:
Repair a poor connector or an open in the ground circuit.
Are the headlamp doors closed at all times? YES
1. Remove the right hand headlamp assembly.
2. Disconnect the control module connectors C1 and C2 to the actuator for the headlamp opening door.
3. Turn the headlamps ON.
4. Connect a test lamp between the headlamps ON input circuit and a known good ground at connector C1.
Does the test lamp illuminate?
Yes or No?
Yes:
Inspect the harness connector for headlamp opening door actuator control module for a poor connection.
No:
Repair a poor connector or an open in the ground circuit.
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3rd Gear
Joined: Apr 2012
Posts: 3
Likes: 0
headlamp door problems
When I turn on the lights everything is fine but when i turn off the lights
both doors close and then the left one comes up halfway. I can crank it down manually. Is it the headlamp control nodule?
both doors close and then the left one comes up halfway. I can crank it down manually. Is it the headlamp control nodule?
Instructor
Joined: Apr 2011
Posts: 161
Likes: 14
From: Florida
Nope. You need to check out the GM service bulletin, tsb 00-08-42-002 for the LH headlight shim fix.
Pro
Joined: Nov 2009
Posts: 606
Likes: 18
From: burke va
Just for an update, I got a used headlight module but before putting it in I jiglgled the connecting wires around on the old one and tapped it a couple of times with a wrench and have not had the problem return (yet).
