GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Isuzu 🢒 2002 🢒 Isuzu T-Series (Truck Line C) 🢒 Brakes 🢒 Park Brake 🢒 Service Park Brake Indicator Inoperative

Circuit Description

The PBCM illuminates the SERVICE PARK BRAKE indicator if a malfunction is detected in the park brake system. The PBCM illuminates the SERVICE PARK BRAKE 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

Test Description

The number below refers to the step number on the diagnostic table.

  1. The PBCM may be damaged if the park brake failure control circuit is shorted to ground.

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. Disconnect the linkage travel switch harness connector.
  3. Turn ON the ignition.

Does the SERVICE PARK BRAKE indicator turn ON?

Go to Step 3

Go to Step 4

3
  1. Turn OFF the ignition.
  2. Reconnect the linkage travel switch harness connector.
  3. Clear DTC 003 from PBCM memory. Refer to Diagnostic Trouble Code (DTC) Clearing .

Did you complete the action?

Go to Diagnostic Aids

--

4
  1. Turn OFF the ignition.
  2. Disconnect from the instrument panel cluster, the harness connector containing the park brake failure control circuit. Refer to Instrument Cluster Replacement in Instrument Panel, Gages, and Console.
  3. Turn ON the ignition.
  4. Connect a test lamp between the park brake failure control circuit and a good ground.

Does the test lamp illuminate?

Go to Step 5

Go to Step 6

5

Inspect the SERVICE PARK BRAKE indicator lamp for an open filament.

Did you find and correct the condition?

Go to Step 11

Go to Step 7

6

  1. Disconnect from the PBCM, the harness connector containing the park brake failure control circuit.
  2. Test the park brake failure control circuit for an open or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 9

7

Inspect for poor connections at the harness connector of the instrument panel cluster. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 8

8

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

Did you complete the replacement?

Go to Step 11

--

9

Inspect for poor connections at the harness connector of the PBCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 10

10

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

Did you complete the replacement?

Go to Step 11

--

11
  1. Turn OFF the ignition for 5 seconds.
  2. Turn ON the ignition.

Does the SERVICE PARK BRAKE indicator turn ON?

Go to Step 12

Go to Step 3

12
  1. Turn OFF the ignition.
  2. Reconnect the linkage travel switch harness connector.
  3. Clear DTC 003 from PBCM memory. Refer to Diagnostic Trouble Code (DTC) Clearing .

Did you complete the action?

System OK

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