Hi There, I'm Clayso a certified master automobile technician with 30 years of automotive repair and diagnostic experience.
From your description as long as there is power at all times on the 2 red wires and power with the lights on, on the yellow and white wires and the ground is good, most likely the module is defective. The link below is a circuit diagram for the headlight doors.
Headlight Doors Circuit
Headlight Doors Circuit: Description and Operation
Voltage to open the headlight doors and to power the solid state circuitry is applied to the headlight control module at all times at terminals "B" and "E" of C2 connector. When the headlights are "OFF," voltage to close the headlight doors is applied to terminal "C" of C2. When the headlights are "ON," voltage is applied to terminal "A" of C2 to allow the Headlight Doors to open.
When the headlights are "ON," voltage is applied to the relay coil. The relay contacts close and voltage is applied to the headlight door motor assemblies. ground is provided for the motors through the solid state circuitry until the headlight doors are open.
When the headlights are "OFF," voltage is reversed across the headlight door motors. The motors run in the opposite direction to close the headlight doors. When the doors are closed, the solid state circuitry senses the motors are not operating and ground is removed.
A test light is recommended to assure the circuits integrity. I hope this information is helpful. If you have any questions let me know. You can reply back to me through this thread at any time.
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