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6.15 - Interior Light door switch ( Dave Lockensgard, December 21, 2001 )

The interior lights and the door open warning light are triggered by a microswitch that is part of the door latch mechanism. Different from the normal push-button arrangement at the door hinge that is usually used. The switch provides a ground signal to the cpu that turns on the lights and the warning.

The problem could be in the switch or in the wiring. To test the switch, take off the door panel and find the connector going up to the door lock. Check the two wires for continuity in the door open and door closed position. If that work O.K., trace the wiring back to the car's interior, looking for a break. Sometimes the wires near the hinge will break due to flexing. It's helpful to have a wiring diagram.

If the switch is bad, you have to remove the latch mechanism to replace it. You might invest in the Haynes manual for the car if it comes to that.

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