Headlight Doors - Automatic: Testing
CAUTION:
Never contact battery voltage across Gray and White wires into actuators. This can cause damage to internal reaction switches.
NOTE:
Fusible links for headlight door system are located on right hand rear of engine at starter solenoid and in front lights harness near the light switch.
- Check voltage at light switch. Turn ignition switch "ON". Terminal B (Red) should read battery voltage at all times. Terminal E (Yellow) should read battery voltage with light switch in "HEAD" position, and 0 volts with switch in "OFF" or "PARK". Terminal J (Gray) should read battery voltage in the "OFF" position and 0 volts in "PARK" or "HEAD" position. If voltage at terminal B is incorrect, check wiring. If E or J is incorrect, replace light switch.
- If one headlight door is not operational, measure voltage to ground at the headlight door relays. Turn ignition "OFF". For Connector C2, terminal A (Red) should read battery voltage at all times. Terminal C (Black) should read 0 volts at all times. Terminal B (Yellow) should read battery voltage with light switch in "HEAD" position and 0 volts in all others.
- For Connector C1, terminal A (White) should read 0 volts at all times, and terminal B (Dark Green) should read battery voltage with light switch in "HEAD" position and 0 volts in all others. If any voltages are incorrect, check wiring. If all are correct, replace headlight door relay.
- Measure voltage at the headlight door motor. Turn ignition "OFF". With light switch in the "OFF" position, terminal A (Gray LH or Red RH) should read battery voltage. In the "HEAD" or "PARK" positions, these terminals should read 0 volts. In any light switch position, terminal B (White LH or Dark Green/White RH) should read 0 volts. Terminal C (Dark Green LH or White/Black RH) should read battery voltage in the "HEAD" position, and 0 volts in any other. If voltage at B or C is incorrect, check wiring before replacing headlight door motor. If terminal A is incorrect, check isolation relay.
- Measure voltage at the isolation relay. Terminal A (Yellow) should read battery voltage with light switch in the "HEAD" position, and 0 volts in the "OFF" or "PARK" position. Terminal B (Gray) should read battery voltage in the "OFF" position and 0 volts in "HEAD" or "PARK". Terminal C (Black) should always read 0 volts. Terminal D (Red) should read 0 volts only in "HEAD" or "PARK" and battery voltage in the "OFF" position. If voltages at terminals A and B are incorrect, check wiring. If C and D are incorrect, replace isolation relay.