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 connector at the headlamp leveling switch.
  2. Place the ignition switch in the RUN position.
  3. Connect an unpowered test lamp between cavity 56B of the headlamp leveling switch connector on CKT 39 (PNK) and ground.

Does the test lamp light?

--

Go to Step 4

Go to Step 3

3

Repair the open in CKT 39 (PNK) between the headlamp leveling switch and the IP fuse block.

Is the repair complete?

--

Go to Headlight Leveling System Check

--

4

  1. Disconnect the connector at the headlamp leveling actuator.
  2. Connect an unpowered test lamp between cavity 3 of the headlamp leveling actuator connector on CKT 39 (PNK) and ground.

Does the test lamp light?

--

Go to Step 6

Go to Step 5

5

Repair the open in CKT 39 (PNK) between the headlamp levelling actuator and the IP fuse block.

Is the repair complete?

--

Go to Headlight Leveling System Check

--

6

Connect an unpowered test lamp between the headlamp leveling switch connector cavity 31A for CKT 150/350 (BLK) and connector cavity 56B for CKT 39 (PNK).

Does the test lamp light?

--

Go to Step 8

Go to Step 7

7

Locate and repair the open in CKT 350 (BLK) between cavity 31A of the headlamp leveling actuator connector and G201.

Is the repair complete?

--

Go to Headlight Leveling System Check

--

8

Connect an unpowered test lamp between cavity 1 of the headlamp leveling actuator connector on CKT 150/350 (BLK) and connector cavity 3 on CKT 39 (PNK).

Does the test lamp light?

--

Go to Step 10

Go to Step 9

9

Locate and repair the open in CKT 350 (BLK) between cavity 1 of the headlamp leveling actuator connector and splice S205.

Is the repair complete?

--

Go to Headlight Leveling System Check

--

10

Connect a J 39200 DMM to CKT 189 (DK GRN) between cavity G of the headlamp leveling switch connector and cavity 2 headlamp leveling actuator connector.

Is continuity present?

--

Go to Step 11

Go to Step 12

11

Replace the headlamp leveling switch.

Is the repair complete?

--

Go to Headlight Leveling System Check

--

12

Repair the open in CKT 189 (DK GRN) between the headlamp leveling switch and splice S151.

Is the repair complete?

--

Go to Headlight Leveling System Check

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