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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 >> P0572-Brake Switch #1 Circuit Low >> 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.

    Remove the Brake Lamp Switch and disconnect the harness connector.

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

    Apply and release the brake pedal plunger 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 LAMP SWITCH SIGNAL CIRCUIT SHORT TO GROUND 
    Fig 1: MEASURING RESISTANCE BETWEEN GROUND AND BRAKE LAMP SWITCH SIGNAL CIRCUIT
    GC0041715Courtesy of DAIMLERCHRYSLER CORP.

    Disconnect the PCM harness connectors.

    Measure the resistance between ground and the (B15) Brake Lamp Switch Signal circuit in the Brake Lamp Switch harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (B15) Brake Lamp Switch Signal circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  4).
  4. 4)  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 with the 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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