GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Check the PANEL DIMMING fuse.

Is the PANEL DIMMING fuse open?

--

Go to Step 2

Go to Step 3

2

Repair short to ground in circuit 32.

Has the repair been made and the system rechecked?

--

Go to Interior Lights Dimming System Check

--

3

  1. Turn the headlamp switch to the PARK position.
  2. Turn the I/P lamp dimmer switch to the HIGH position.
  3. Using a test lamp, backprobe between the I/P dimmer switch connector terminal D and ground.

Does the test light illuminate?

--

Go to Step 5

Go to Step 4

4

Repair poor connection or an open in circuit 32.

Has the repair been made and the system rechecked?

--

Go to Interior Lights Dimming System Check

--

5

Using a test lamp, backprobe between the I/P dimmer switch harness connector terminal C and ground.

Does the test light illuminate?

--

Go to Step 7

Go to Step 6

6

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

Has the repair been made and the system rechecked?

--

Go to Interior Lights Dimming System Check

--

7

Repair poor connection or open in circuit 8 between the I/P lamp dimmer switch terminal C and S203.

Has the repair been made and the system rechecked?

--

Go to Interior Lights Dimming System Check

--