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
The Smart Junction Box (SJB) monitors the instrument panel dimmer switch status on circuit CLN28 (GN/BU) to determine if the courtesy lamps are requested. When the instrument panel dimmer switch is rotated to the dome detent position, ground is supplied to circuit CLN28 (GN/BU). Power is supplied to the courtesy lamps through the SJB fuse 9 (15A). When any door is opened, the ajar switch opens, signaling the SJB or the Remote Function Actuator (RFA) module (if equipped with Intelligent Access (IA)). The SJB or the RFA module (if equipped) monitors the ajar circuits and Remote Keyless Entry (RKE) transmitter input. Based on the input status, the SJB supplies voltage to the courtesy lamps on circuit VLN33 (GY/VT). Ground is supplied through circuits GD133 (BK) and GD116 (BK/VT) 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 CIRCUIT VLN33 (GY/VT) FOR AN OPEN
- Ignition OFF.
- Disconnect: SJB C2280a.
- NOTE: If the jumper wire fails, refer to the Wiring Diagrams to identify the possible causes of the circuit short.
- 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 A2.
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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A2 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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