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Left headlight
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Drifting
Joined: Apr 2007
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From: Lafayette Louisiana
So you turn lights off. They both go down but the left one pops back up and if you lower it manually it stays down. Is that what is happening? If so, this will be an interesting thread. It may be a failing Head Light Control Module. Here is a post I did last year. Trouble shooting procedure my help you find problem. I'm not saying you should fix it the way I did if it turns out to be HCM. But then after a year my fix is still working perfectly. 
https://www.corvetteforum.com/forums...ol-module.html
https://www.corvetteforum.com/forums...ol-module.html
Last edited by UM Rebel; Apr 22, 2018 at 03:18 PM.
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Headlight
So you turn lights off. They both go down but the left one pops back up and if you lower it manually it stays down. Is that what is happening? If so, this will be an interesting thread. It may be a failing Head Light Control Module. Here is a post I did last year. Trouble shooting procedure my help you find problem. I'm not saying you should fix it the way I did if it turns out to be HCM. But then after a year my fix is still working perfectly.
https://www.corvetteforum.com/forums...ol-module.html
https://www.corvetteforum.com/forums...ol-module.html
Drifting
Joined: Apr 2007
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From: Lafayette Louisiana
If it's missing the down bump stop you will be able to tell by manually lowering. If you can keep on turning after light is fully down and continuing to turn light will come back up. If you can not turn anymore after it's fully down, bump stop is ok.
I'm thinking if that's what's happening then when you turn lights back on light would do just the opposite. That is it would go down then go up again. .
I'm thinking if that's what's happening then when you turn lights back on light would do just the opposite. That is it would go down then go up again. .
Last edited by UM Rebel; Apr 23, 2018 at 11:16 AM.
Melting Slicks
Joined: Jan 2009
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From: Miami FL
As I mentioned above in Post No. 8 there is a TSB (Technical Service Bulletin) from GM addressing these very same symptoms in the driver's side headlight. 
Last edited by GCG; Apr 23, 2018 at 11:29 AM.
Drifting
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From: SF Bay Area
Usually the bump stops wear down on one side and not the other. They'll stop properly when going up, but not when going down. Also, the manual test is not a reliable one because you'll be able to feel the resistance of the stop, but the motor can overpower it if it is just marginal.