Pinpoint Test C: All Dimmable Switch Illumination Is Inoperative

Instrument Cluster and Panel Illumination

Pinpoint Tests

Pinpoint Test C: All Dimmable Switch Illumination Is Inoperative

Refer to Wiring Diagram Set 71, Cluster and Panel Illumination for schematic and connector information. Diagrams By Number

Normal Operation

When the parking lamps are on, the Smart Junction Box (SJB) sends a pulse-width modulated voltage to the dimmable illumination sources on 2 separate circuits, based on input received from the instrument panel dimmer switch.

This pinpoint test is intended to diagnose the following:

- Fuse
- SJB



PINPOINT TEST C: ALL DIMMABLE SWITCH ILLUMINATION IS 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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C1 CHECK THE EXTERIOR LAMP OPERATION


- Place the headlamp switch in the PARKING LAMPS ON position.
- Are the parking lamps illuminated?

Yes
VERIFY the SJB fuse 23 (15A) is OK. If OK, GO to C2. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. Diagrams By Number

No
REFER to Lighting and Horns.

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C2 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. REFER to Body Control Systems. 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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