Pinpoint Test D: The Courtesy Lamps Are Always On
Interior Lighting
Pinpoint Test D: The Courtesy Lamps Are Always On
Refer to Wiring Diagram Set 89, Interior Lamps for schematic and connector information. Diagrams By Number
Refer to Wiring Diagram Set 117, Remote Keyless Entry and Alarm for schematic and connector information. Diagrams By Number
Normal Operation
The Body Control Module (BCM) sends a voltage signal to each door ajar switch (integrated into the door latch), which is routed to ground when the door is closed (the door ajar switch is closed when the door is closed). When the door is opened, the signal to ground is interrupted, indicating an open door to the BCM. When the BCM determines a door is open, the battery saver relay energizes (if not already energized) to supply voltage to the interior lamps and then the BCM provides ground to the courtesy lamps.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Door latch
- BCM
PINPOINT TEST D: THE COURTESY LAMPS ARE ALWAYS ON
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
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D1 CHECK THE DOOR AJAR PIDs
- Ignition ON.
- Close all the doors.
- Enter the following diagnostic mode on the scan tool: BCM DataLogger.
- Monitor the BCM door ajar switch PIDs while opening and closing all the doors.
- Do all the door ajar switch PID values agree with the door positions?
Yes
GO to D5.
No
GO to D2.
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D2 BYPASS THE SUSPECT DOOR LATCH
- Ignition OFF.
- Disconnect: Suspect Door Latch .
- Ignition ON.
- Connect a fused jumper wire between the suspect door latch pins, harness side as follows:
- Monitor the suspect BCM door ajar switch PID.
- Does the PID indicate the suspect door is closed?
Yes
REMOVE the jumper wire. INSTALL a new door latch for the one in question. REFER to Handles, Locks, Latches and Entry Systems Front Door Latch or Rear Door Latch. TEST the system for normal operation.
No
REMOVE the jumper wire. GO to D3.
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D3 BYPASS THE DOOR LATCH GROUND CIRCUIT
- Connect a fused jumper wire between the suspect door latch, harness side and ground as follows:
- Monitor the suspect BCM door ajar switch PID.
- Does the PID indicate the suspect door is closed?
Yes
REMOVE the jumper wire. REPAIR the door latch ground circuit in question for an open. TEST the system for normal operation.
No
REMOVE the jumper wire. GO to D4.
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D4 CHECK THE DOOR AJAR SWITCH INPUT CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: BCM C2280G.
- Measure the resistance between the suspect door ajar switch, harness side and the BCM, harness side as follows:
- Is the resistance less than 5 ohms?
Yes
GO to D6.
No
REPAIR the door ajar input circuit in question for an open. TEST the system for normal operation.
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D5 CHECK THE COURTESY LAMP GROUND CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: BCM C2280C.
- Measure the resistance between the BCM C2280C-5, circuit CLN03 (YE/GY), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to D6.
No
REPAIR circuit CLN03 (YE/GY) for an open. TEST the system for normal operation.
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D6 CHECK FOR CORRECT BCM OPERATION
- Disconnect all the BCM connectors.
- Check for:
- corrosion
- pushed-out pins
- Connect all the BCM connectors and make sure they seat correctly.
- Operate the system and determine if the concern is still present.
- Is the concern still present?
Yes
INSTALL a new BCM. REFER to Multifunction Electronic Modules Body Control Module (BCM). 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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