Pinpoint Test B: All Dimmable Non-Networked Illumination Is Inoperative

Instrument Cluster and Panel Illumination

Pinpoint Tests

Pinpoint Test B: All Dimmable Non-Networked 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 Body Control Module (BCM) provides voltage to the hardwired dimmable illumination sources based on the Steering Column Control Module (SCCM) illumination messages that are sent over the network to the BCM.





This pinpoint test is intended to diagnose the following:

- Fuse
- Wiring, terminals or connectors
- BCM

PINPOINT TEST B: ALL DIMMABLE NON-NETWORKED 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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B1 CHECK FOR RECORDED BCM DTCs FROM THE ON-DEMAND SELF-TEST

- Use the recorded results from the BCM self-test.
- Is DTC B1315:15 present?

Yes
GO to B2.

No
VERIFY the SJB fuse 12 (15A) is OK. If OK, GO to B2.

If not OK, Refer to Wiring Diagrams to identify the possible causes of the circuit short. After the repair: Diagrams By Number

If no DTCs are present, TEST the system for normal operation.

If DTC U1000:00 is present, CLEAR the DTCs and REPEAT the self-test (required to enable the backlighting output driver if DTC U1000:00 is present). TEST the system for normal operation.

If DTC U3000:49 is present, INSTALL a new BCM. REFER to Multifunction Electronic Modules Service and Repair. TEST the system for normal operation.

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B2 BYPASS THE BCM

- Ignition OFF.
- Disconnect: BCM C2280b .

- NOTE: If the jumper wire fails, Refer to Wiring Diagrams to identify the possible causes of the circuit short. After the repair: Diagrams By Number

If no DTCs are present, test the system for normal operation.

If DTC U1000:00 is present, clear the DTCs and repeat the self-test (required to enable the courtesy lamp output driver if DTC U1000:00 is present). Test the system for normal operation.

If DTC U3000:49 is present, install a new BCM. Refer to Multifunction Electronic Modules Service and Repair. Test the system for normal operation.

- Connect a fused jumper wire between the BCM C2280b-40, circuit VLN04 (VT/GY) and battery positive.




- Do the backlighting components illuminate?

Yes
REMOVE the jumper wire. GO to B3.

No
REMOVE the jumper wire. REPAIR circuit VLN04 (VT/GY) for an open. TEST the system for normal operation.

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B3 CHECK FOR CORRECT BCM OPERATION

- Disconnect all the BCM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the BCM 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 BCM. REFER to Multifunction Electronic Modules Service and Repair. 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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