Pinpoint Test D: The Courtesy Lamps Do Not Turn On With One Door Open
Interior Lighting
Pinpoint Tests
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. The door ajar switches provide a path for ground supplied through the ajar switches, 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, Mounting and Cables Battery Disconnect.
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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 FOR VOLTAGE TO THE DOOR AJAR SWITCH USING THE CONNECTOR GROUND
- Measure the voltage between the suspect door ajar switch connector pins, harness side as follows:
- Is the voltage greater than 10 volts?
Yes
INSTALL a new door ajar switch for the switch in question. REFER to Handles, Locks, Latches and Entry Systems Door Ajar Switch - Front Door Ajar Switch - Rear Door. TEST the system for normal operation.
No
REPAIR the ground circuit in question for an open. 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 input circuit in question for an open. 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. REFER to Multifunction Electronic Modules Service and Repair. 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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