Pinpoint Test B: An Individual Courtesy Lamp Is Inoperative

Interior Lighting

Pinpoint Tests

Pinpoint Test B: An Individual Courtesy Lamp Is Inoperative

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

Normal Operation

The Lighting Control Module (LCM) supplies voltage to the courtesy lamps.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Interior lamp

PINPOINT TEST B: AN INDIVIDUAL COURTESY LAMP IS INOPERATIVE

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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B1 CHECK THE COURTESY LAMP INPUT CIRCUIT FOR AN OPEN


- Disconnect: Inoperative Courtesy Lamp.
- Open any door.
- Measure the voltage between the inoperative courtesy lamp, harness side and ground as follows:









- Is the voltage greater than 10 volts?

Yes
GO to B2.

No
REPAIR circuit 53 (BK/LB) for an open. TEST the system for normal operation.

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B2 CHECK FOR VOLTAGE TO THE COURTESY LAMP USING THE CONNECTOR GROUND


- Measure the voltage between the inoperative courtesy lamp pins, harness side as follows:









- Is the voltage greater than 10 volts?

Yes
INSTALL a new interior lamp. TEST the system for normal operation.

No
REPAIR circuit 57 (BK) for an open. TEST the system for normal operation.

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