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

Instrument Cluster and Panel Illumination

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 Electrical Diagrams.

Normal Operation

When the parking lamps are on, the Body Control Module (BCM) provides voltage to the hard-wired dimmable illumination sources based on the hard-wired inputs from the instrument panel dimmer switch to the BCM (Body Control Module).

- DTC U2010:11 (Switch Illumination: Circuit Short To Ground)- A continuous and on-demand DTC that sets when the BCM (Body Control Module) has temporarily shut down the output driver. The module has temporarily disabled the backlighting output because an excessive current draw exists (such as a short to ground). The BCM (Body Control Module) cannot enable the backlighting output until the cause of the short is corrected, the DTCs have been cleared and an ignition cycle takes place.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- BCM (Body Control Module)

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.

B1 CHECK THE INSTRUMENT PANEL DIMMER SWITCH

- While observing the Instrument Panel Cluster (IPC), press the instrument panel dimmer switch up and down.

Does the backlighting in the IPC (Instrument Panel Cluster) increase and decrease intensity?

Yes
GO to B2.

No
GO to Pinpoint Test A Pinpoint Test A: All Dimmable Illumination Does Not Increase/Decrease Brightness.

B2 BYPASS THE BCM (Body Control Module)

- Ignition OFF.

- Disconnect: BCM (Body Control Module) C2280E.

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

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

If DTCs are present, clear the DTCs and repeat the self-test. Test the system for normal operation.
Connect a fused jumper wire between the BCM (Body Control Module) C2280E-20, circuit CLN04 (BU/BN) and battery positive.






Do the backlighting components illuminate?

Yes
REMOVE the jumper wire. GO to B3.

No
REMOVE the jumper wire. REPAIR circuit CLN04 (BU/BN) for an open. TEST the system for normal operation.

B3 CHECK FOR CORRECT BCM (Body Control Module) OPERATION

- Disconnect all the BCM (Body Control Module) connectors.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect all the BCM (Body Control Module) 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 (Body Control Module). 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.