GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Isuzu 🢒 2001 🢒 Isuzu T-Series (Truck Line C) 🢒 Brakes 🢒 Park Brake 🢒 Apply Park Brake Indicator Always On

Circuit Description

The park brake control module illuminates the APPLY PARK BRAKE indicator when the ignition is OFF and the parking brake is released. The PBCM illuminates the indicator by supplying voltage to the lamp.

Diagnostic Aids

Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to the following:

    •  Testing for Electrical Intermittents
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs
    •  Connector Repairs

Step

Action

Yes

No

Schematic Reference: Park Brake System Schematics

1

Did you perform the Parking Brake Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Park Brake

2
  1. Turn OFF the ignition.
  2. Apply the park brake.

Does the APPLY PARK BRAKE indicator turn OFF?

Go to Diagnostic Aids

Go to Step 3

3

Disconnect from the PBCM, the harness connector containing the apply park brake indicator control circuit.

Does the Apply Park Brake indicator turn OFF?

Go to Step 6

Go to Step 4

4
  1. Disconnect from the instrument panel cluster, the harness connector containing the apply park brake indicator control circuit. Refer to Instrument Cluster Replacement in Instrument Panel, Gages, and Console.
  2. Test the apply park brake indicator control circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 7

Go to Step 5

5

Replace the instrument panel cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gages, and Console.

Did you complete the replacement?

Go to Step 7

--

6

Replace the PBCM. Refer to Park Brake Control Module Replacement .

Did you complete the replacement?

Go to Step 7

--

7

Apply the park brake.

Does the APPLY PARK BRAKE indicator turn OFF?

System OK

Go to Step 3