Pinpoint Test D: The Courtesy Lamps Do Not Turn On With One Door Open

Interior Lighting

Pinpoint Test D: The Courtesy Lamps Do Not Turn On With One Door Open

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

Normal Operation

The Driver Door Module (DDM) monitors the LH front door ajar switch on circuit 867 (DB), and the remaining door ajar switches on circuit 627 (BK/OG). The door ajar switches provide a path for ground supplied through the ajar switches by circuit 676 (PK/OG), indicating an open door. The DDM then signals the Lighting Control Module (LCM) to supply power to the courtesy lamps.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Door ajar switch
- DDM



PINPOINT TEST D: THE COURTESY LAMPS DO NOT TURN ON WITH ONE DOOR OPEN

NOTE: The LCM may be configured for a police vehicle. In the police configuration, the LCM ignores the door ajar switch inputs for interior lighting. Check the LCM for correct configuration before continuing diagnostics.

NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.

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D1 CHECK THE SUSPECT DOOR AJAR SWITCH


- Ignition OFF.
- Disconnect: Suspect Door Ajar Switch.
- Measure the voltage between the suspect door ajar switch connector, harness side and ground as follows:





- Is the voltage greater than 10 volts?

Yes
GO to D2.

No
GO to D3.

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D2 CHECK CIRCUIT 57 (BK) FOR AN OPEN


- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the suspect door ajar switch connector, harness side and ground as follows:





- Is the resistance less than 5 ohms at the suspect door ajar switch?

Yes
INSTALL a new door ajar switch for the switch in question. TEST the system for normal operation.

No
REPAIR the circuit in question. TEST the system for normal operation.

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D3 CHECK THE DOOR AJAR REFERENCE CIRCUIT FOR AN OPEN


- Disconnect: DDM C501a and C501b.
- Measure the resistance between the suspect door ajar switch, harness side and the DDM, harness side as follows:





- Is the resistance less than 5 ohms?

Yes
GO to D4.

No
REPAIR the circuit in question. TEST the system for normal operation.

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D4 CHECK FOR CORRECT DDM OPERATION


- Disconnect all the DDM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the DDM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?

Yes
INSTALL a new DDM. TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

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