GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Turn the headlamp switch to the PARK position and the dimmer switch to the OFF position on the headlamp and instrument panel (IP) lamp dimmer switch.
  2. Use a test lamp in order to backprobe between the inoperable vacuum fluorescent (VF) display harness connector CKT 308 to ground.

Does the test lamp light?

--

Go to Step 2

Go to Step 3

2

Use a test lamp in order to backprobe the inoperable VF display between CKT 308 and the following ground circuits:

    • CKT 1450
    • CKT 1550
    • CKT 351

Does the test lamp light?

--

Go to Step 5

Go to Step 4

3

  1. Repair the following conditions in CKT 308 between S223 and the inoperable component.
  2. • A poor connection
    • An open
  3. Inspect the system.

Is the symptom still present?

--

Go to Step 4

Go to Interior Lights Dimming System Check

4

  1. Repair the following conditions in ground CKT 1450, CKT 1550 or CKT 351 between the inoperable VF display and G200, G201, G302 or G401.
  2. • A poor connection
    • An open
  3. Inspect the system.

Is the symptom still present?

--

Go to Step 5

Go to Interior Lights Dimming System Check

5

  1. Replace the bulbs in the component, as needed.
  2. Replace the affected component, as needed.
  3. Inspect the system.

Is the symptom still present?

--

--

Go to Interior Lights Dimming System Check