GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Apply the parking brake.
  2. Place the ignition switch in RUN.

Is the brake indicator illuminated?

--

Go to Step  5

Go to Step  2

2

  1. Disconnect the connector at the park brake warning switch.
  2. Connect a fused jumper between the park brake warning switch cavity A CKT 1134 (LT BLU) and ground.

Is the brake indicator illuminated?

--

Go to Step  6

Go to Step  3

3

  1. Disconnect the instrument cluster connector.
  2. Connect a test lamp between the instrument cluster connector cavity A6 and ground.

Does the test lamp light?

--

Go to Step  4

Go to Step  7

4

  1. Disconnect the body control module.
  2. Connect a self-powered test lamp at the instrument cluster connector cavity A6 CKT 1807 (PPL) and the body control module connector C1 cavity  A12.

Does the test lamp light?

--

Go to Step  5

Go to Step  8

5

  1. Reconnect all components.
  2. Position the vehicle safely for the release of the park brake.
  3. Release the parking brake.
  4. Start the engine while observing the instrument cluster.

Is the brake indicator illuminated while the ingnition switch is in START?

--

Go to Step  9

Go to Step  10

6

Adjust the park brake warning switch.

Is the repair complete?

--

Go to Brake Warning System Check

--

7

Locate and repair open in CKT 340 (ORN) between the IP fuse block and the instrument cluster.

Is the repair complete?

--

Go to Brake Warning System Check

--

8

Locate and repair open in CKT 1807 (PPL) between the instrument cluster and the body control module.

Is the repair complete?

--

Go to Brake Warning System Check

--

9

  1. Connect a self-powered test lamp between the body control module connector C1cavity B10, CKT 1134 (LT BLU) and ground.
  2. Test for continuity.

Does the test lamp light?

--

Go to Step  10

Go to Step  11

10

Replace park brake warning switch.

Is the repair complete?

--

Go to Brake Warning System Check

--

11

Locate and repair open in CKT 1134 (LT BLU) between the body control module and the park brake warning switch.

Is the repair complete?

--

Go to Brake Warning System Check

--