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Home >> Chrysler >> 2006 >> PT Cruiser Base, 2D Convertible, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> 2.4L Engine - DTCS PO509 To P0850 >> Diagnosis And Testing >> P0573-Brake Switch #1 Circuit High >> Diagnostic Test

Diagnostic Test

  1. 1)  ACTIVE DTC 

    Ignition on, engine not running.

    With a scan tool, read DTCs.

    Is the DTC active at this time? 

    Yes 

    1. Go To  2).

    No 

    1. Refer to the INTERMITTENT CONDITION diagnostic procedure.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  2. 2)  BRAKE LAMP SWITCH OPERATION 

    Turn the ignition off.

    Disconnect the Brake Lamp Switch harness connector.

    Measure the resistance between the (Z902) Ground circuit terminal and the (B15) Brake Switch Signal circuit terminal in the Brake Lamp Switch.

    Apply and release the brake pedal while monitoring the ohmmeter.

    Does the resistance change from below 5.0 ohms to an open circuit? 

    Yes 

    1. Go To  3).

    No 

    1. Replace the Brake Lamp Switch.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  3. 3)  (B15) BRAKE SWITCH SIGNAL CIRCUIT OPEN 
    Fig 1: MEASURING RESISTANCE OF THE BRAKE SWITCH SIGNAL CIRCUIT
    GC0041716Courtesy of DAIMLERCHRYSLER CORP.

    Disconnect the PCM harness connectors.

    CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.

    Measure the resistance of the (B15) Brake Switch Signal circuit from the Brake Lamp Switch harness connector to the appropriate terminal of special tool #8815.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go To  4).

    No 

    1. Repair the open in the (B15) Brake Switch Signal circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  4. 4)  GROUND CIRCUIT OPEN 
    Fig 2: MEASURING RESISTANCE BETWEEN GROUND CIRCUIT AND GROUND AT THE BRAKE LAMP SWITCH HARNESS CONNECTOR
    GC0041717Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between the (Z902) Ground circuit and ground at the Brake Lamp Switch harness connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go To  5).

    No 

    1. Repair the open in the (Z902) Ground circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  5. 5)  PCM 
    NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

    Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

    If there are no possible causes remaining, view repair. 

    Repair 

    1. Replace and program the Powertrain Control Module in accordance Service Information. Refer to MODULE-POWERTRAIN CONTROL and STANDARD PROCEDURE - PCM/ECM/SKREEM PROGRAMMING .
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
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