GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the Lighting Systems Diagnostic System Check performed?

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Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

  1. Disconnect the headlamp switch connector C2.
  2. Connect a fused jumper from the headlamp switch connector C2 cavity A (PPL) to ground.

Does all of the incandescent lighting for INC DIM 2 light?

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Go to Step 3

Go to Step 5

3

Inspect CKT 150 (BLK) for an open. Refer to Testing for Continuity in Wiring Systems.

Is CKT 150 OK?

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Go to Step 4

Go to Step 7

4

Replace the headlamp switch. Refer to Headlamp Switch Replacement in Lighting Systems.

Is the headlamp switch replacement complete?

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Go to Step 8

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5

Inspect CKT 328 (PPL) for an open. Refer to Testing for Continuity in Wiring Systems.

Is CKT 328 OK?

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Go to Step 6

Go to Step 7

6

Replace the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console.

Is the instrument cluster replacement complete?

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Go to Step 8

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7

Repair the suspect wiring. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Step 8

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8

Operate the system in order to verify the repair. Did you correct the condition?

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System OK.

Go to Step 2