Pinpoint Test C: The Courtesy Lamps Are Inoperative - Using The Instrument Panel Dimmer Switch

Interior Lighting

Pinpoint Tests

Pinpoint Test C: The Courtesy Lamps Are Inoperative - Using The Instrument Panel Dimmer Switch

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 2085 (VT/YE) to determine if the courtesy lamps are requested. Based on the instrument panel dimmer switch status, the SJB supplies voltage and ground to the courtesy lamps.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Instrument panel dimmer switch
- SJB



PINPOINT TEST C: THE COURTESY LAMPS ARE INOPERATIVE - USING THE INSTRUMENT PANEL DIMMER SWITCH

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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C1 CHECK THE INSTRUMENT PANEL DIMMER SWITCH


- Ignition OFF.
- Disconnect: Instrument Panel Dimmer Switch C2298.
- Carry out the instrument panel dimmer switch component test.

- Is the instrument panel dimmer switch OK?

Yes
GO to C2.

No
INSTALL a new instrument panel dimmer switch. TEST the system for normal operation.

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C2 CHECK CIRCUIT 2085 (VT/YE) FOR AN OPEN


- Disconnect: SJB C2280b.
- Measure the resistance between the SJB C2280b-14, circuit 2085 (VT/YE), harness side and the instrument panel dimmer switch C2298-5, circuit 2085 (VT/YE), harness side.




- Is the resistance less than 5 ohms?

Yes
GO to C3.

No
REPAIR the circuit. TEST the system for normal operation.

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C3 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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