GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the entire Headlamp Leveling System Check performed?

--

Go to Step 2

Go to Headlight Leveling System Check

2

  1. Disconnect the inoperative headlamp leveling actuator connector at the back of the motor.
  2. Place the ignition switch in the RUN position.
  3. Turn the headlamp switch to the HEAD position.
  4. Connect a test light between cavity 3 of the headlamp leveling actuator connector circuit 10 and ground.

Does the test light illuminate?

--

Go to Step 4

Go to Step 3

3

Locate and repair the open in circuit 10.

Is the repair complete?

--

Go to Step 9

--

4

Connect a test light between cavity 1 of the headlamp leveling acutator connector of circuit 150 (LH) or 250 (RH) and cavity 3 of circuit 10.

Does the test light illuminate?

--

Go to Step 6

Go to Step 5

5

Locate and repair the open in circuit 150 (LH) or 250 (RH).

Is the repair complete?

--

Go to Step 9

--

6

  1. Place the headlamp leveling switch in the 0 position.
  2. Connect a voltmeter between the following components:
  3. • The cavity 2 of the headlamp leveling actuator connector
    • Ground

Does the voltmeter read less than the specified value?

4.5 Volts

Go to Step 8

Go to Step 7

7

Replace the headlamp leveling actuator. Refer to Headlamp Leveling Actuator Replacement .

Is the repair complete?

--

Go to Step 9

--

8

Locate and repair the open in circuit 869.

Is the repair complete?

--

Go to Step 9

--

9

  1. Turn the ignition switch to the OFF position.
  2. Reconnect all connectors/components removed.

Have all repairs been made?

--

Go to Headlight Leveling System Check

--