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1985 Corvette Healights Wont Go Down

Old 11-09-2018, 02:11 PM
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Stubs
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Default 1985 Corvette Healights Wont Go Down

Hello everyone, i am new to this forums and happy to be here. My 1985 Corvette's headlights wont retreact into their housing, the headlights come on but when i shut the headlights off the headlights won't retreact. Any idea's of what could be wrong would be greatly apprecated. Thanks
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Old 11-09-2018, 02:47 PM
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Check the plugs for the motors, they could be loose or corroded. On my 93 the previous owner disconnected the motor ground because the gears were stripped instead of fixing them.

That brings me to another solution, try turning the ****. If that doesn't move the headlights, you'll have to take the motor apart and replace the bushings and possibly the gear. They were nylon and over the years age and heat take their toll and they disintegrate. Takes maybe 45 minutes to change them yourself, and there are several videos on youtube that go through the process. Best part is you can remove them from the hood and work on a bench. You'll need Torx bits and I believe a punch to completely disassemble.
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Old 11-09-2018, 03:01 PM
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Originally Posted by Eilias View Post
Check the plugs for the motors, they could be loose or corroded. On my 93 the previous owner disconnected the motor ground because the gears were stripped instead of fixing them.

That brings me to another solution, try turning the ****. If that doesn't move the headlights, you'll have to take the motor apart and replace the bushings and possibly the gear. They were nylon and over the years age and heat take their toll and they disintegrate. Takes maybe 45 minutes to change them yourself, and there are several videos on youtube that go through the process. Best part is you can remove them from the hood and work on a bench. You'll need Torx bits and I believe a punch to completely disassemble.
thanks for the response I will check that out, just saw a chrisfix video where he changed the gears.
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Old 11-09-2018, 03:07 PM
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Originally Posted by Stubs View Post
Hello everyone, i am new to this forums and happy to be here. My 1985 Corvette's headlights wont retreact into their housing, the headlights come on but when i shut the headlights off the headlights won't retreact. Any idea's of what could be wrong would be greatly apprecated. Thanks
sounds like a possible relay issue - time to dig out the FSM. under electrical diagnosis, reference "headlight doors" - pgs 168-171 --

Last edited by Joe C; 11-09-2018 at 03:13 PM.
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Old 11-09-2018, 03:43 PM
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Please be advised: Many people, (even on this very educational forum!) aren't aware that the headlight design for the '84-'87 Corvette is ENTIRELY DIFFERENT than the '88-'96 Corvette. Be very careful of any suggestions from someone who owns an '88 & up Corvette!

How long have you owned this car? Did both headlight motors quit at the same time?

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Old 11-09-2018, 03:46 PM
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Originally Posted by Hot Rod Roy View Post
Please be advised: Many people, (even on this very educational forum!) aren't aware that the headlight design for the '84-'87 Corvette is ENTIRELY DIFFERENT than the '88-'96 Corvette. Be very careful of any suggestions from someone who owns an '88 & up Corvette!

How long have you owned this car? Did both headlight motors quit at the same time?

owned the car for about 4 years now, and both of the headlights did quit at the same time, all of a sudden they wouldnít go down
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Old 11-09-2018, 04:09 PM
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Originally Posted by Stubs View Post
Owned the car for about 4 years now, and both of the headlights did quit at the same time, all of a sudden they wouldn’t go down.
That tells me Joe C has given you some excellent advice! Thanks Joe! You do have the FSM for your car, don't you?

(FSM - Factory Service/Shop Manual)

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Old 11-09-2018, 04:20 PM
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Originally Posted by Hot Rod Roy View Post
That tells me Joe C has given you some excellent advice! Thanks Joe! You do have the FSM for your car, don't you?

(FSM - Factory Service/Shop Manual)

just have the owners manual if thatís what you mean. You think it is a relay and not the gears?
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Old 11-09-2018, 04:43 PM
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The early C4 headlamps have 3 relays. One for each lamp motor and an "isolation relay". The isolation relay changes the current polarity so that when you turn off the headlamps, that relay changes the polarity so that the motors run in reverse which then closes the lamp buckets. The 3 relays are located at the left front of the car under a metal plate. They are attached to the front of the left side wheelwell.

The isolation relay is the smaller of the 3; You my want to remove that relay and clean the harness contacts and the contacts on the relay. If that doesn't work, a replacement relay may be the solution. I don't think they are very expensive
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Old 11-09-2018, 05:08 PM
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Originally Posted by c4cruiser View Post
The early C4 headlamps have 3 relays. One for each lamp motor and an "isolation relay". The isolation relay changes the current polarity so that when you turn off the headlamps, that relay changes the polarity so that the motors run in reverse which then closes the lamp buckets. The 3 relays are located at the left front of the car under a metal plate. They are attached to the front of the left side wheelwell.

The isolation relay is the smaller of the 3; You my want to remove that relay and clean the harness contacts and the contacts on the relay. If that doesn't work, a replacement relay may be the solution. I don't think they are very expensive
thanks for the input, will check that out for sure
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Old 11-13-2018, 10:15 PM
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I put a new isolation relay in and the headlights still wonít go down, I donít think it is the headlight motors or gears because how could both of them break at the exact time. Any thoughts???
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Old 11-14-2018, 04:38 AM
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Originally Posted by Stubs View Post

just have the owners manual if that’s what you mean. You think it is a relay and not the gears?
(my scanner's down for the count, so all I can provide are a few pics) if you're serious about "wrench bending" on your car, you need to invest in a FSM.

here is a few pics of the headlight door diagram and diagnostics.





Last edited by Joe C; 11-14-2018 at 04:43 AM.
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Old 11-14-2018, 10:29 PM
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Make sure you **** didn't go to far down the stalk because it will stop to soon to take the headlights down.
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Old 11-15-2018, 12:06 PM
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I have the same problem on mine. Headlights stuck up, but if I tap the drivers side housing I can hear the motor trying to turn for a second, then it'll stop. Thinking the motors are blown?
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