Pinpoint Test B: The Courtesy Lamps Do Not Turn On With One Door Open
Interior Lighting
Pinpoint Tests
Pinpoint Test B: 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
When a door is open, the ajar switch opens the circuit to the Smart Junction Box (SJB). The SJB monitors the ajar circuits, and based on the ajar status, the SJB supplies voltage and ground to the courtesy lamps.
The SJB sends a voltage reference signal to the LH door ajar switch through circuit 1312 (LG/BK) and the RH door ajar switch through circuit 1314 (YE/LG). The door ajar switch routes the signal to ground through circuit 1205 (BK). When the door is opened, the door ajar switch opens the circuit, signaling the SJB a request for the courtesy lamps.
The power window motors also use this input for the short drop feature.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Door ajar switch
- Power window motor
- SJB
PINPOINT TEST B: THE COURTESY LAMPS DO NOT TURN ON WITH ONE DOOR OPEN
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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B1 CHECK THE DOOR AJAR SWITCH
- Ignition OFF.
- Disconnect: Suspect Door Ajar Switch.
- Do the courtesy lamps turn on?
Yes
INSTALL a new door ajar switch for the switch in question. TEST the system for normal operation.
No
GO to B2.
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B2 CHECK THE POWER WINDOW MOTOR FOR SHORT TO GROUND
- Disconnect: Corresponding Power Window Motor C518 (LH) or C623 (RH).
- Do the courtesy lamps turn on?
Yes
INSTALL a new power window motor. TEST the system for normal operation.
No
GO to B3.
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B3 CHECK THE DOOR AJAR SWITCH SIGNAL CIRCUIT FOR A SHORT TO GROUND
- Disconnect: SJB C2280e.
- Measure the resistance between the LH door ajar switch C526-2, circuit 1312 (LG/BK), harness side and ground; or between the RH door ajar switch C602-2, circuit 1314 (YE/LG), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to B4.
No
REPAIR the circuit in question. TEST the system for normal operation.
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B4 CHECK FOR CORRECT SJB OPERATION
- Disconnect all the SJB connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the SJB 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 SJB. 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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