Test I: Parking Brake Applied (PBA) Switch
PINPOINT TEST I: PARKING BRAKE APPLIED (PBA) SWITCHFlow Chart:
This pinpoint test is intended to diagnose the following:
- PBA switch
- parking brake signal circuit short to ground
- parking brake signal circuit open
- powertrain control module (PCM) (12A650)
Parking Brake Applied (PBA) Switch Connector
Parking Brake Applied (PBA) Switch Connector:
PCM Connector
PCM Connector:
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I1 : DIAGNOSTIC TROUBLE CODE (DTC) P1536
NOTE: When performing the key on engine running (KOER) self-test, wait 5 seconds after beginning the test before operating the parking brake.
- Possible causes:
- parking brake not applied and released during KOER self-test
- PBA switch
- parking brake signal circuit short to ground
- parking brake signal circuit open
- Ignition ON, engine OFF.
- Access the PCM and monitor the PARK_BRK PID.
- Apply and release the parking brake.
- Does the PARK_BRK PID indicate OFF with the parking brake released and ON with the parking brake applied?
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I2 : CHECK THE PBA SWITCH
- Ignition OFF.
- PBA Switch connector disconnected.
- Ignition ON, engine OFF.
- Access the PCM and monitor the PARK_BRK PID.
- Does the PARK_BRK PID indicate OFF?
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I3 : CHECK THE PARKING BRAKE SIGNAL CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- PCM connector disconnected.
- Measure the resistance between:
- Is the resistance greater than 10 kOhm?
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I4 : CHECK THE PARKING BRAKE SIGNAL CIRCUIT VOLTAGE
- Ignition OFF.
- PBA Switch connector disconnected.
- Ignition ON, engine OFF.
- Measure the voltage between:
- Is the voltage greater than 10 V
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I5 : CHECK THE PARKING BRAKE CIRCUIT FOR AN OPEN
- Ignition OFF.
- PCM connector disconnected.
- Measure the resistance between:
- Is the resistance less than 5 Ohm?
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I6 : CHECK THE PARKING BRAKE GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Measure the resistance between:
- Is the resistance less than 5 Ohm?
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I7 : CHECK FOR CORRECT PCM OPERATION
- Disconnect all the PCM connectors.
- Visually inspect for:
- pushed out pins
- corrosion
- Connect all the PCM connectors and make sure they seat correctly.
- Carry out the PCM self-test and verify the concern is still present.
- Is the concern still present?
