Pinpoint Test C: The Instrument Cluster (IC) Illumination Is Inoperative/Does Not Dim

Instrument Cluster and Panel Illumination

Pinpoint Test C: The Instrument Cluster (IC) Illumination Is Inoperative/Does Not Dim

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 C: THE IC ILLUMINATION IS INOPERATIVE/DOES NOT DIM

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C1 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 Module Communications Network Testing and Inspection.

No
INSTALL a new IC. REFER to Instrumentation, Message Center, and Warning Chimes Instrument Cluster (IC). TEST the system for normal operation.

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