Pinpoint Test D: The Demand Lighting Is Inoperative

Interior Lighting

Pinpoint Tests

Pinpoint Test D: The Demand Lighting Is Inoperative

Refer to Wiring Diagram Set 89, Interior Lamps for schematic and connector information. Diagrams By Number

Normal Operation

The Generic Electronic Module (GEM) supplies voltage to the interior lamps through the battery saver output circuit. When the front interior lamp control switch is in the ON position, the switch closes to ground illuminating the demand lamps.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Front interior lamp


PINPOINT TEST D: THE DEMAND LIGHTING IS INOPERATIVE

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery, Mounting and Cables Battery Disconnect.

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D1 CHECK THE FRONT INTERIOR LAMP OPERATION


- Check the operation of the front interior lamp in both the ON and DOOR positions.
- Is the front interior lamp inoperative in both positions?

Yes
GO to Pinpoint Test B. Pinpoint Test B: The Courtesy Lamp(s) Are Inoperative

No
GO to D2.

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D2 CHECK THE DEMAND LAMPS GROUND CIRCUITS FOR AN OPEN


- Disconnect: Negative Battery Cable.
- Disconnect: Front Interior Lamp C931b.
- Measure the resistance between the front interior lamp C931b-2, circuit 31-LC7 (BK), harness side and ground.




- Is the resistances less than 5 ohms?

Yes
INSTALL a new front interior lamp. REFER to Interior Lamp Service and Repair. TEST the system for normal operation.

No
REPAIR circuit 31-LC7 (BK) for an open. TEST the system for normal operation.

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