GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Is the lamp that is inoperative the radio control switch?

--

Refer to Steering Wheel Controls Illumination Inoperative

Go to Step 2

2

  1. Turn the headlamp switch to the PARK position.
  2. Turn the dimmer switch to the HIGH position.
  3. Using a test light, backprobe between the inoperable lamp harness connector circuit 8 and ground.

Does the test light illuminate?

--

Go to Step 4

Go to Step 3

3

Repair a poor connection or an open in circuit 8 between S203 and the inoperable component.

Has the repair been made and the system rechecked?

--

Refer to Interior Lights Dimming System Check

--

4

Using a test light, backprobe the inoperable lamp harness connector between circuit 8 and the ground (circuit 750, 1450, 1550, or 1750).

Does the test light illuminate?

--

Go to Step 6

Go to Step 5

5

Repair a poor connection or an open in the ground circuit between the inoperable component (circuit 750, 1450, 1550, or 1750) and G200, G201, G203, or G301.

Has the repair been made and the system rechecked?

--

Refer to Interior Lights Dimming System Check

--

6

Replace the bulb/inoperable component.

Has the repair been made and the system rechecked?

--

Refer to Interior Lights Dimming System Check

--