GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the Interior Lights Dimming System Check performed?

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Go to Step 2

Go to Interior Lights Dimming System Check

2

  1. Release the parking brake.
  2. Shine a bright light at the ambient light sensor.
  3. Turn the ignition switch on.
  4. Turn the headlamp switch to the PARK position.
  5. Turn the I/P lamp dimmer switch past the MAX position (first detent).
  6. Disconnect the I/P lamp dimmer switch electrical connector.

Did the VF displays (radio, PRNDL, odometer and heater-A/C control-CJ2 only) get brighter?

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Go to Step 3

Go to Step 4

3

Replace the I/P lamp dimmer switch. Refer to Instrument Panel Multifunction Switch Assembly Replacement for service procedure.

Is the repair complete?

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Go to Interior Lights Dimming System Check

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4

Repair short to B+ in circuit 308.

Is the repair complete?

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Go to Interior Lights Dimming System Check

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