1. Check the wiring at the headlight door control module. Check for voltage on the Blue/White wire at terminal C with the headlight switch off and 0 volts when the headlight switch is in Park or headlight position.2. Check the Yellow wire at terminal (A) should have 0 volts with the headlamps switched off and in the Park position. Battery voltage should appear when the headlamp switch is in the headlamp position.3. Check for a good ground at terminal D.
Did you check the ground at (D) The test are still the same, The headlight doors recieve power thru the module you have to see why the module is not opening and closing the motor circuit at the proper times.
Still all boils down to terminals A,C or D.
I'm betting on a conection problem in the ground circuit.
Let me do a little research
Also am checking somthing else out the motor should shut it self off not the module. I am trying to find out what is suposed to stop motor.
Will see what I can find .