GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the entire headlight leveling system check performed?

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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 headlamps on.
  4. Connect a test light between cavity 3 of the headlamp leveling actuator connector circuit 10 and ground.

Does the test light illuminate?

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Go to Step 4

Go to Step 3

3

Locate and repair the open in circuit 10.

Is the repair complete?

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Go to Step 9

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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

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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

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8

Locate and repair the open in circuit 869.

Is the repair complete?

--

Go to Step 9

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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

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