Pinpoint Test B: The Instrument Cluster (IC) Illumination Is Inoperative

Instrument Cluster and Panel Illumination

Pinpoint Test B: The Instrument Cluster (IC) Illumination Is Inoperative

Normal Operation

The Lighting Control Module (LCM) communicates the requested level of backlighting intensity to the Instrument Cluster (IC) through the Standard Corporate Protocol (SCP) network.

This pinpoint test is intended to diagnose the following:

- IC
- LCM



PINPOINT TEST B: THE IC ILLUMINATION IS INOPERATIVE

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B1 CHECK THE IC FOR CORRECT ILLUMINATION


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Network Test.
- Carry out the network test.
- Does the scan tool respond with no communication with the IC?

Yes
REFER to Information Bus.

No
INSTALL a new IC. TEST the system for normal operation.

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