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Headlight doors not working properly?

Tiny
MIKE H R
  • MECHANIC
  • 1984 PONTIAC FIREBIRD
  • 2.1L
  • V6
  • 2WD
  • MANUAL
  • 133,000 MILES
Turn on the headlights and the headlight open up, turn them off and both doors go down and then the one on the passenger's side goes back up. Changed motors, and module still happens. The door stays up until I go under the hood and wind it back down.
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Sunday, September 11th, 2022 AT 3:29 PM

2 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,262 POSTS
Hi,

Have you checked the relay related to the headlamp motor? It has been a while since I worked on one of these, but it wasn't uncommon for the relay to fail and cause the lamp to reopen or close while driving. LOL

There are two relays to consider. One is the motor relay and the other is called an isolation relay. I attached a pic below showing locations under the hood.

Check both. Make sure they are mounted firmly to get a good ground. Also, I would switch one at a time with the opposite side that works to see if the problem moves to the opposite side.

The issue is the relay isn't made anymore. However, we will cross that bridge when and if we get to it. We'll figure something out.

Let me know what you find.

Take care,

Joe

See pic below.
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Sunday, September 11th, 2022 AT 7:04 PM
Tiny
STEVE W.
  • MECHANIC
  • 12,998 POSTS
Looking at the wiring diagram it looks like either there is a short in the actuator relay circuit or possibly the gearing in the drive is failing. You say you switched a module, which one?
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Sunday, September 11th, 2022 AT 7:05 PM

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