Did you perform Diagnostic System Check ?

Go to Step 2

Go to Diagnostic System Check

When performing the Diagnostic System Check, was DTC B2646 displayed for the Instrument Panel Module?

Go to Diagnostic Trouble Code (DTC) List/Type in Lighting Systems

Go to Step 3

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. With a scan tool, perform the WOW Instrument Cluster command in Instrument Panel Cluster special functions.

Do all HVAC control head segments illuminate?

Go to Step 4

Go to Step 7

When performing the WOW Instrument Cluster command, do all other VF displays illuminate?

Go to Step 5

Go to Symptoms - Lighting Systems in Lighting Systems

1. Cover the sun load sensor.
2. Turn ON the lights.

Is there backlighting?

Go to Step 6

Go to Symptoms - Lighting Systems in Lighting Systems

Adjust the dimming control from minimum to maximum intensity.

Does the VF display increase and decrease in intensity?

System OK

Go to Step 7

Inspect for poor connections at the harness connector of the instrument panel module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 9

Go to Step 8

Replace the instrument panel module. Refer to Instrument Panel Module Replacement in Body Control System.

Did you complete the repair?

Go to Step 9

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2