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Diagnostic Test

  1. 1)  GOOD TRIP INDICATED 
    NOTE: Verify battery voltage is greater than 9 volts.

    Turn the ignition on.

    Record Freeze Frame Data that was set by the related DTC before continuing.

    With the scan tool, read DTCs.

    Does the Good Trip Indicator display NO? 

    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)  TEST FOR VOLTAGE AT STOP LAMP SWITCH CONNECTOR 
    Fig 1: CHECKING FOR VOLTAGE AT STOP LAMP SWITCH CONNECTOR
    GC0041929Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition on.

    With a 12-volt test light connected to ground, back probe the (B15) circuit at the Stop Lamp Switch harness connector.

    Does the test light illuminate brightly? 

    Yes 

    1. Replace the Stop Lamp Switch.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  3).
  3. 3)  (B15) SECONDARY BRAKE SWITCH/BRAKE LAMP SWITCH CIRCUIT SHORT TO GROUND 
    Fig 2: CHECKING SECONDARY BRAKE SWITCH/BRAKE LAMP SWITCH CIRCUIT
    GC0041933Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the PCM harness connector.

    Disconnect the Stop Lamp Switch Harness connector.

    Test for continuity between (B15) Secondary Brake Switch harness connector and ground.

    Is there continuity? 

    Yes 

    Repair the short to ground in the (B15) Secondary Brake Switch/Brake Lamp Signal circuit.

    No 

    1. Go To  4).
  4. 4)  (B15) SECONDARY BRAKE SWITCH/BRAKE LAMP SWITCH SIGNAL CIRCUIT CONTINUITY 
    Fig 3: CHECKING SECONDARY BRAKE SWITCH/BRAKE LAMP SWITCH SIGNAL CIRCUIT
    GC0041930Courtesy of DAIMLERCHRYSLER CORP.

    Test for continuity on circuit B15 between the Stop Lamp Switch harness connector and the PCM harness connector.

    Is there continuity? 

    Yes 

      NOTE: Before Continuing: Check the PCM harness connector and the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary.
    1. Replace and program the Powertrain Control Module in accordance with the Service Information. (Refer to STANDARD PROCEDURE - PCM/ECM/SKREEM PROGRAMMING) .
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

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