Pinpoint Test A: The Courtesy Lamps Are Inoperative

Interior Lighting

Pinpoint Tests

Pinpoint Test A: The Courtesy Lamps Are Inoperative

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

Normal Operation

Power is supplied to the courtesy lamps through the Smart Junction Box (SJB) fuse 9 (15A). When any door or the liftgate is opened, the ajar switch opens, signaling the SJB. The SJB monitors the ajar switches, instrument panel dimmer switch and Integrated Keyhead Transmitter (IKT) input. Based on the input status, the SJB supplies voltage to the courtesy lamps on circuit VLN33 (GY/VT). Ground is supplied through circuit GD133 (BK) for the courtesy lamps.

- DTC B2A35 (Interior Lighting Output Circuit Open) - an on-demand DTC that sets when the SJB detects an open from the interior lighting circuit.
- DTC B2A36 (Interior Lighting Output Circuit Short To Ground) - a continuous and on-demand DTC that sets when the SJB detects a short to ground from the interior lighting circuit.

This pinpoint test is intended to diagnose the following:

- Fuse
- Wiring, terminals or connectors
- SJB



PINPOINT TEST A: THE COURTESY LAMPS ARE INOPERATIVE

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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A1 CHECK THE OPERATION OF THE DEMAND LIGHTING


- Operate the demand lighting function on any courtesy lamp.
- Does the courtesy lamp illuminate with the demand lighting function?

Yes
GO to A2.

No
REPAIR circuit GD133 (BK) for an open. TEST the system for normal operation.

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A2 CHECK CIRCUIT VLN33 (GY/VT) FOR AN OPEN


- Ignition OFF.
- Disconnect: SJB C2280a.
- NOTE: If the jumper wire fails, repair circuit VLN33 for a short to ground.
- Connect a fused jumper wire between the SJB C2280a-9, circuit VLN33 (GY/VT), harness side and battery positive.




- Do the courtesy lamps illuminate?

Yes
VERIFY the SJB fuse 9 (15A) is OK. If OK, GO to A3. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short.

No
REPAIR the circuit. RUN the on-demand self-test (required to clear certain DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.

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A3 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. CLEAR the DTCs. REPEAT the self-test.

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