I assume that my car is pre headlight module, so where should I start? Turn on the lights, head lights and all exterior lights as well as dash lights all come on but no movement at all on the motors. What's the best starting point and steps to find the issue?

 

You could unplug each headlight motor and use a jumper wire directly to a battery to see if they move.

 

Normally , putting power to a device to check functionality is acceptable troubleshooting practice , but here it could get you into trouble . Reason being that the way your lights are supposed to work is that when the lights reach their end of travel in either direction (open or closed) there is a limit switch that controls the relay to remove power from the motor the instant that end travel is reached . If you apply power to it and it runs hard right to the ends of it's mechanical limit rather than the limit switch things could get stripped or otherwise broken .

I will include the wiring diagram for your lights ....

 

Now , looking at that diagram , when the lights are off there is supposed to be +12V on the white wire going into the isolation relay , and there is supposed to be +12V on the yellow wire into the relay with the lights on . This will be your first check with a 12V automotive test light , you will properly ground the wire coming from the test light and probe the white and yellow wires to see if the white is +12V with the headlight switch off and the yellow is +12V with the light switch in the on position . If this checks out , your headlight switch is OK and then move on to checking the isolation relay itself and then finally each headlight door's relay itself . It's likely that since both don't move it's the isolation relay or before that electrically like the headlight switch or the power to the headlight switch or maybe even the red fusable link but electrical checks will determine which of these causes it is .

 

So now say supposing you DO have +12V on the yellow wire into the isolation relay , the next check will be the pink wire coming from the isolation relay that feeds each headlight motor's separate actuator relay +12V power to lift the lids . If no power is on the pink , with power on the yellow (and the black wire to the relay being assured of having a proper ground) then the isolation relay is bad . To check for a good ground at the black wire take the wire clip from the testlight off of ground , connect it to a known +12V source and probe the black wire at the bottom of the relay's connector .

 

So , lets say you DO have +12V on the pink with the lightswitch on , the next checks will be at the motor's actuator relays themselves , pick whichever is most convienent to get to for the next checks . First up , just for grins , check that the pink going into the actuator relay does in fact have power (ruling out any harness or connector issues up to this point) and of course check the black ground wire the same way you checked it for the isolation relay . If all is good a next check will be to make sure there is +12V on the red/white going into the actuator relay from the red fusable link . Now if all these checks are good so far your last two possibilities could be two bad actuator relays or two bad headlight motor/switch assemblies , but you'll likely find the problem in one of the electrical checks .

One last thought here , they will not go up , have you used the provision on the motors to manually raise the doors (with the headlights on) and then switch the lights off and see if they close ?

 

Ok they wont go up or down with the headlight switch. I did try some juice from the battery and the light flip up. Didnt leave it on long enough to hit the limit, just wanted to see if they move. I pulled one of the relays off and its really gooped up

 

With the relay off the only wire i have power on is the red wire with lights on and off

 

Where would the isolation relay be on my car? I see the 2 relays by the motors but don't know where to look for the isolation relay at

 

You will need to do a search here for a thread that describes the isolation relay's location , my car being an 89 has the module and so I don't know where your relay would be . When you find it , do the checks I mentioned above with the white and yellow wires , that will be a good middle point of the system .