GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

DEFINITION: The headlamp leveling system operates properly, but the switch is not illuminated when the park lamps are turned on.

1

Review the switch illumination operation and perform the necessary inspections.

Did you complete the system review and inspection?

--

Go to Step 2

Go to Symptoms

2

Attempt to operate the IP illumination lamps.

Does the DRL switch illumination operate normally?

--

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

Attempt to operate the headlamp leveling system.

Does the headlamp leveling system operate normally?

--

Go to Step 4

Go to Headlight Leveling Inoperative

4

  1. Place the headlamp switch in the PARK LAMPS position.
  2. Disconnect the connector at the headlamp leveling switch.
  3. At the headlamp leveling switch connector, measure the voltage of CKT 8 (GRY) from the PARK LPS fuse.

Is the measurement equal to battery voltage?

B+

Go to Step 6

Go to Step 5

5

Locate and repair the open in CKT 8 (GRY).

Did you complete the repair?

--

Go to Step 7

--

6

Replace the headlamp leveling switch.

Did you complete the repair?

--

Go to Step 7

--

7

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3