One headlight won't go up!!
Thread Starter
Drifting
Joined: Oct 2001
Posts: 1,444
Likes: 4
From: Hawthorne NJ
One headlight won't go up!!
Within the last year and a half I have taken both headlight motors apart on my '89 coupe and replaced those three nylon barrels in each. Both times it solved the problem. Now my pass. headlight won't come up.
Could it be the same thing? I do remember a couple of weeks ago that the headlight door had ice on it and wouldn't come up until I cleared it. But I think I used the headlights since then...???
Any ideas?
Thanks
Could it be the same thing? I do remember a couple of weeks ago that the headlight door had ice on it and wouldn't come up until I cleared it. But I think I used the headlights since then...???
Any ideas?
Thanks
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
If your 89 has headlight relays, check the relay for that headlight. You can swap relays to see if the problem follows the relay. Also, you can check the headlight motor by unplugging it and jumping 12v from the battery to the headlight motor to force it to run.
Team Owner
Joined: May 2001
Posts: 36,106
Likes: 2,511
From: ...tearing up the highways, one state at a time™®©
Originally Posted by joseph p
I cranked it up by hand. When I turn off the lights it goes down...but then it won't go back up by itself.
????????
????????
Replace the delrin bushings -
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
I don't know what year the C4's went to an electronic switch for the headlight motors, but if you have relays, there are three relays, one for each side and an additional one for making the right door to go down. If you will swap the two headlight door relays (not the isolation relay) and the left headlight won't go up, then the trouble is the relay which isn't expensive. This is an easy test, give it a try!
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Safety Car
Joined: May 1999
Posts: 3,651
Likes: 5
From: Atlantis
Cruise-In I Veteran
Originally Posted by 4Ever21
What if the headlights go up, but one motor continues to run after the headlights are up and working?
The 84 had a three wire motor circuit and limit switches, I believe.
The newer system has TWO WIRE motors with no limit switches to report the position of the transport assembly.
The newer system uses a Headlight Control Module mounted on the left front wheelhouse.
There is a CURRENT SENSE circuit in the module that senses when the lights are open or closed by the increased current draw of the electric motors.
It's a 'stereo" (two channel) sensor and either side can fail and affect the operation of it's respective motor.
If the motors are NOT running replace the module. If the motors ARE running but the assembly is not moving properly check the gears and mechanical assembly.
Team Owner
Joined: Feb 2006
Posts: 24,460
Likes: 7
From: sw Ohio
When I turn them on, they both operate normally, both headlights work. However, on the driver side, the motor continues to run even though the headlight is up. It does it when I close them too. If I pull the **** out just slightly when they're closed, the motor shuts off. Its an '85 and there are no bushings to replace, it has 2 gears.
