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. Diagrams By Number
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.
- DTC U2010:11 (Switch Illumination: Circuit Short To Ground) - A continuous and on-demand DTC that sets when the BCM 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 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
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 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 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
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B2 BYPASS THE BCM
- Ignition OFF.
- Disconnect: BCM C2280E .
- NOTE: If the jumper wire fails, refer to the 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 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 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.
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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 Body Control Module (BCM). 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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