GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

SCHEMATIC REFERENCE: Interior Lights Dimming Schematics

1

Did you perform the Lighting Systems Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

Test the feed circuit of the incandescent lamp(s) for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 5

Go to Step 3

3

Inspect for poor connections at the dash integration module (DIM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 5

Go to Step 4

4

Replace the DIM. Refer to Dash Integration Module Replacement in Body Control System.

Did you complete the replacement?

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Go to Step 5

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5

Operate the system in order to verify the repair.

Did you find and correct the condition?

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System OK

Go to Step 2