GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the interior lights dimming system check performed?

--

Go to Step 2

Go to Interior Lights Dimming System Check

2

Check the I/P lamp dimmer switch harness connector for a poor connection.

Is there a poor connection?

--

Go to Step 4

Go to Step 3

3

  1. Turn the ignition switch to the ON position.
  2. Turn the headlamp switch to the PARK position.
  3. Using the J-39200 backprobe the I/P dimmer switch connector terminal A to ground.

Is the voltage within the specified range?

Less Than 1.0 V

Go to Step 5

Go to Step 6

4

Repair poor connection at the I/P dimmer switch.

Is the repair complete?

--

Go to Interior Lights Dimming System Check

--

5

Replace the I/P dimmer switch. Refer to Instrument Panel Multifunction Switch Assembly Replacement in Instrument Panel, Gauges and Console for service procedure.

Is the repair complete?

--

Go to Interior Lights Dimming System Check

--

6

Repair the open or high resistance connection between the I/P dimmer switch connector terminal A and G201.

Is the repair complete?

--

Go to Interior Lights Dimming System Check

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