Can't see in the dark

I have a 98 Firebird. When I turn on the lights the driver side motor runs to long and grindes down the gears in the motor. What stops the motor from running to long of a cycle?

I am not sure about the firebird, but other cars I have seen have vacuum controls, so my first guess would be a bad vacuum hose or diaphram.

The headlight door motors are controlled by the Headlight Door Module located in the fender in front of the left front tire. It sounds like HDM is malfunctioning.


Thanks for the reply. I don’t think this type of setup has a vacuum system? Although, I will give it a look. Take it easy waterboy