GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics

Connector End View Reference: Lighting Systems Connector End Views , Computer/Integrating Systems Connector End Views in Computer/Integrating Systems, or Hydraulic Brake Connector End Views in Hydraulic Brakes

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

Verify that the daytime running lamps (DRL) headlamps are on with the parking brake applied.

Do the DRL headlamps operate normally with the parking brake applied?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

  1. Set the park brake.
  2. Turn the ignition ON with the engine OFF.
  3. With the scan tool, read the park brake switch status.

Does the scan tool display SET?

Go to Step 6

Go to Step 4

4

  1. Disconnect the park brake switch.
  2. Connect a fused jumper wire between the park brake switch signal circuit and the ground circuit.
  3. With the scan tool, read the park brake switch status.

Does the scan tool display SET?

Go to Step 7

Go to Step 5

5

Test for an open or high resistance in the park brake switch signal circuit or ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct a condition?

Go to Step 10

Go to Step 6

6

Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 8

7

Inspect for poor connections at the harness connector of the park brake switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 9

8

Replace the BCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 10

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9

Replace the park brake switch. Refer to Parking Brake Indicator Switch Replacement in Park Brake.

Did you complete the replacement?

Go to Step 10

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10

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3