GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

Connector End View Reference: Master Electrical Component List

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

  1. Turn OFF the ignition.
  2. Turn the headlamp switch to the OFF position.

Do the park lamps operate properly?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Disconnect the lamp switch assembly.

Are the park lamps illuminated?

Go to Step 4

Go to Step 11

4

Test for a short to ground in the park lamp ON signal circuit. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 13

Go to Step 5

5

Test for the following in the exterior lamps OFF input circuit:

    • An open
    • A short to battery positive voltage
    • A short to ground

Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 13

Go to Step 6

6

The PK LP relay is located on the reverse side of the I/P fuse block.

Remove the PK LP relay.

Do the park lamps turn OFF?

Go to Step 7

Go to Step 10

7

  1. Reconnect the lamp switch assembly.
  2. Turn the headlamp switch to the OFF position.
  3. Using a test lamp connected to battery positive voltage, probe the park lamp relay control circuit at the I/P fuse block.

Does the test lamp illuminate?

Go to Step 8

Go to Step 9

8

Test for a short to ground in the park lamp relay control circuit. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 13

Go to Step 12

9

Replace the PK LP relay. Refer to Relay Replacement .

Did you complete the replacement?

Go to Step 13

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10

Repair a short to battery positive voltage in the park lamp voltage supply circuit. Refer to Circuit Testing and Wiring Repairs .

Did you complete the repair?

Go to Step 13

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11

Replace the lamp switch assembly. Refer to Headlamp Switch Replacement .

Did you complete the repair?

Go to Step 13

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12

Replace the body control module (BCM). Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 13

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13

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3