GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Turn the headlamp switch to the HEAD position.
  2. Turn the headlamp switch to the HIGH position.
  3. Using a test light, probe between the instrument cluster harness connector terminal A12 and ground.

Does the test light illuminate?

--

Go to Step 3

Go to Step 2

2

Repair the poor connection or open in circuit 640 between the fuse block connector terminal E2 and the instrument cluster harness connector terminal A12.

Has the repair been made?

--

Go to Headlight System Check

--

3

  1. Leave the headlamp switch in the HEAD position and on HIGH
  2. Using a test light, backprobe between the instrument cluster harness connector terminal B2 and ground.

Does the test light illuminate?

--

Go to Step 4

Go to Step 5

4

Repair the poor connection or open in circuit 1200 between the instrument cluster connector harness terminal B2 and C201 terminal K.

Has the repair been made?

--

Go to Headlight System Check

--

5

Service the instrument cluster. Refer to Diagnostic System Check - Instrument Cluster in Instrument Panel, Gauges and Console .

Has the repair been made?

--

Go to Headlight System Check

--