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 dimmer switch to the HIGH position.
  3. Using test light, backprobe between the instrument cluster harness connector terminal D6 and ground.

Does the test light illuminate?

--

Go to Step 3

Go to Step 2

2

Check for a poor connection an open in circuit 629.

Is there a poor connection or an open in circuit 629?

--

Go to Step  7

Go to Step 6

3

Using a test light, backprobe between the instrument cluster harness connector terminal D6 and D3.

Does the test light illuminate?

--

Go to Step 5

Go to Step 4

4

Repair the poor connection or an open in circuit 150 between the instrument cluster connector harness terminal D3 and G205.

Has the repair been made?

--

Go to Headlight System Check

--

5

For further diagnostics and repair refer to Instrument Cluster System Check .

Has the repair been made?

--

Go to Headlight System Check

--

6

Replace the DRL control module. Refer to Daytime Running Lights (DRL) Control Module Replacement .

Has the repair been made?

--

Go to Headlight System Check

--

7

Repair the poor connection or an open in circuit 629.

Has the repair been made?

--

Go to Headlight System Check

--