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Diagnostic Test

WARNING: This page is about a different car, the 2016 Jeep Wrangler and 2015 Jeep Wrangler. However, it is still accessible from the selected car via links, so may be relevant.
  1. VERIFY THE DTC IS ACTIVE 
    NOTE:

    Diagnose and repair all PCM and any communication faults that are present before continuing with this test procedure.

    NOTE:

    If applicable make sure the Stop Lamp Switch is properly adjusted in accordance with Service Information before continuing.

    1. Ignition on, engine not running.
    2. With a scan tool, record and erase the DTCs.
    3. Cycle the ignition from off to on.
    4. Press the brake pedal.
    5. With a scan tool, read the DTCs.

      Is the DTC Active at this time?

      Yes 

      • Go To  2

      No 

      • Perform the ABS INTERMITTENT CONDITION diagnostic procedure. Refer to STANDARD PROCEDURE .
  2. (B15) BRAKE SIGNAL 1 CIRCUIT SHORTED TO VOLTAGE 
    1. Ignition on, engine not running.
    2. Using a 12-volt test light connected to ground, back probe the (B15) Brake Signal 1 circuit.

      Does the test light illuminate brightly?

      Yes 

      • Go To  3

      No 

  3. STOP LAMP BRAKE PEDAL SWITCH SHORTED 
    1. Turn the ignition off to the lock position.
    2. Disconnect the Stop Lamp Switch harness connector.
    3. Measure the resistance of the Stop Lamp Switch between (B15) Brake Signal 1 circuit and (A108) Fused B(+) circuit at the Stop Lamp Switch harness connector.

      Is there continuity?

      Yes 

      • Replace the Stop Lamp Switch in accordance with the Service Information
      • Go To  4

      No 

      • Go To  5
  4. CHECK (B15) BRAKE SIGNAL 1 CIRCUIT SHORTED TO VOLTAGE 
    1. Connect the Stop Lamp Switch harness connector.
    2. Ignition on, engine not running.
    3. Using a 12-volt test light connected to ground, back probe the (B15) Brake Signal 1 circuit at the Stop Lamp Switch harness connector.

      Does the test light illuminate?

      Yes 

      • Go To  5

      No 

      • Repair the short to voltage in the (B15) Brake Signal 1 circuit.
      • Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  5. CHECK ABS MODULE BACKFEEDING VOLTAGE TO (B15) BRAKE SIGNAL 1 CIRCUIT 
    1. Turn ignition off to the lock position.
    2. Disconnect the ABS Module harness connector.
    3. Ignition on, engine not running.
    4. Using a 12-volt test light connected to ground, test the (B15) Brake Signal 1 circuit at the Stop Lamp Switch harness connector.

      Does the test light illuminate?

      Yes 

      • Go To  6

      No 

      • Replace the Anti-lock Brake System (ABS) Module in accordance with Service Information
      • Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  6. CHECK TIPM MODULE BACKFEEDING VOLTAGE TO (B15) BRAKE SIGNAL 1 CIRCUIT 
    1. Turn the ignition off.
    2. Disconnect the TIPM harness connector.
    3. Ignition on, engine not running.
    4. Using a 12-volt test light connected to ground, test the (B15) Brake Signal 1 circuit.

      Does the test light illuminate?

      Yes 

      • Repair the short to voltage in the (B15) Brake Signal 1 circuit.
      • Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Replace and program the Totally Integrated Power Module (TIPM) in accordance with the Service Information.
      • Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
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