Hi. I am trying to figure out why my driver's side headlight is not going up. This problem occurred out of the blue awhile back. When I was at dealer last week for something else I told the service rep I couldn't get a hot reading on my harness and he said they would check. They said it was hot and I took their word for it. After changing headlight motor it still did not raise. Then I did what I should have originally. I hooked 2 wires from passenger side headlight harness hot side to driver side motor lead and up she went. Wasted $150 on rebuilt motor. I read about fuse links and relays. Are these motors on separate fused leads? Thanks for any help.

 

What year? Might look at the module connections in front of the drivers front tire. Or a ground.

 

Thanks for reply. I have a 1990 zr1. I have no idea what or where the module is located or the connection and what it looks like. I have a 3 prong connector for the headlight and 2 prong for motor. Sorry about not identifying car first Antfarmer2. Considering hard wiring to right motor, but I assume they do this separately for a reason on these motors. Are there 2 modules? Thanks for your help. Scott

 

This is the headlight motor controller. It is located under the driver's side headlight and is attached to the wheel well. It consists of 3 relays that reverse the polarity of the voltage to the headlight motors when they reach the mechanical limits (open and closed).

 

SamsZR1, I'd say that dealer owes you a correct repair job!

Gents, all C4 ZR-1's have the same headlight assemblies. The year doesn't matter. And they don't use any relays. Sorry.

 

Sam there are two 15 amp circuit breakers that feed the headlights control module that Cliff mentioned and located. I don't know where those breakers are but they are connected to the 2 orange wires that feed the control module and you may be able to trace them back but no guarantees. My guess they would be near or on the fuse block.

Good luck and let us know what you find.

 

There are two fusible links that are hot all the time and come from the battery jumper block which is behind and below the battery.

The headlight control module is bolted to the front of the driver side plastic wheel well.

Connector C1 of the module is 4 pins and are the wires going to each motor.

Driver side motor uses
Pin A Gray/Black wire
Pin B Dark Green/Black wire

Passenger side motor uses
Pin C Dark Green wire
Pin D Gray wire

If you disconnect the 4 pin connector plug you can use an ohm meter from Pin A to Pin B on the disconnected plug end. You should measure a low resistance which would verify there is continuity in that circuit for the Driver side headlight motor. You can compare the resistance reading with the passenger side motor which is Pin C to Pin D.

If that checks out disconnect connector C2 at the control module 5 pin plug.
Verify you have 12 volts at Pin E. You can use Pin D Black wire for your volt meter or test light ground.

This is the pin out for the 5 pin connector,

Pin A yellow wire is 12 volts from the headlight switch when the switch is in Head.
Pin B is a heavy gauge Red wire and is a fusible link hot all the time and used for the Passenger side motor.
Pin C is a White wire and provides 12 volts when the headlight switch is OFF.
Pin D is a Black wire and is Ground.
Pin E is a heavy gauge Red wire and is a fusible link hot all the time and used for the Driver side motor.

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Note when you are done testing disconnect the negative battery cable before you plug the connectors back into the headlight control module. The service manual says the module can be damaged if you plug the connector in when the battery is connected.
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Here's a picture of the headlight control module GM #16510537.



Here's the schematic.

 

Thanks for all the input on this. When I get the chance I will try to check out the correct fusible link behind battery. I can see the orange wires there but will have to pull battery cover to get to them. For now I have wired into my right light and all is working as should. Don't know if the original motor assy bound up and blew link or what. By the time I added wires I had already changed the motor assy. Thanks again