GM Service Manual Online
For 1990-2009 cars only

Step

Action

Values

Yes

No

1

Did you perform the Interior Lights System Check?

--

Go to Step 2

Go to Interior Lamps System Check

2

  1. Turn the combination switch to the PARK position.
  2. Using a test lamp, backprobe the illumination controller from cavity 2 to ground.

Does the test lamp light?

--

Go to Step 3

Go to Step 5

3

Inspect for a short to ground in the RED/GRN wire between the illumination controller and the illumination lamps.

Is the connection OK?

--

Go to Step 4

Go to Step 6

4

Replace the illumination controller. Refer to Instrument Panel Lamp Dimmer Switch Replacement in Instrument Panel,Gauges and Console.

Is the repair complete?

--

Go to Interior Lamps System Check

--

5

Repair the open in the RED/YEL wire between S218 and the illumination controller. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Interior Lamps System Check

--

6

Repair the short to ground in the RED/GRN wire between the illumination controller and the illumination lamps. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Interior Lamps System Check

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