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Opening Sequence

NOTE: Measuring voltage at the motor outputs of the Headlight Door Module is NOT a valid diagnosis procedure. The module rapidly pulses current to the door motor on (hi) and off (low). The pulsing is too rapid to see or measure with a voltmeter. When the pulse signal is low the spinning door motor acts like a generator. The module can detect the voltage produced by the motor and continues the pulsing signal. The door motor stops turning when the headlight doors are fully open, fully closed or jammed. Once the motor stalls, no voltage is produced and the module turns off the motor. If the motor runs longer than approximately 6 seconds (disconnected drive linkage) the module will turn off the motor.

When the Light Switch is in Head or Twilight Sentinel is activated, battery voltage is applied to both terminals A and C of the Headlight Door Module connector C1. See WIRING DIAGRAMS  . With battery voltage applied to both terminals A and C, the Headlight Door Module does not energize its relay. Voltage is applied to terminal B at the Headlight Doors Motor. The motor is controlled by the module switching the ground path. When the doors are fully open the module turns off the motor.

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