GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the Headlamp 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. Connect an unpowered test lamp between cavity 3 of the headlamp leveling actuator connector CKT 39 (PNK) and ground.

Does the test lamp light?

--

Go to Step 4

Go to Step 3

3

Locate and repair the open in CKT 39 (PNK) between the headlamp leveling actuator and splice S149.

Is the repair complete?

--

Go to Headlight Leveling System Check

--

4

Connect an unpowered test lamp between cavity 1 of the headlamp leveling acutator connector of CKT 350 (BLK) and cavity 3 of CKT 39 (PNK).

Does the test lamp light?

--

Go to Step 6

Go to Step 5

5

Locate and repair the open in CKT 350 (BLK) between cavity 1 of the headlamp leveling actuator connector and splice S150.

Is the repair complete?

--

Go to Headlight Leveling System Check

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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.

Is the repair complete?

--

Go to Headlight Leveling System Check

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8

Locate and repair the open in CKT 189 (DK GRN) between cavity 2 of the headlamp leveling actuator connector and splice S151.

Is the repair complete?

--

Go to Headlight Leveling System Check

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