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Pinpoint Test B: DTC P1572 Or DTC P1703 - Brake On/Off Circuit Failure

WARNING: This page is about a different car, the 2006 Mercury Milan, 2006 Lincoln Zephyr, and 2006 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
  1. B1 CHECK THE OPERATION OF THE STOPLAMPS 
    • Key in ON position.
    • Operate the stoplamps.
    • Do the stoplamps operate correctly? 

    Yes  : GO to B2.

    No  : REFER to EXTERIOR LIGHTING to continue diagnosis of the stoplamps.

  2. B2 CHECK CIRCUIT CCB08 (VT/WH) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: PCM C175b.
    • Key in ON position.
    • While applying the brake pedal, measure the voltage between the PCM C175b-46, circuit CCB08 (VT/WH), harness side and ground.
      Fig 1: Checking Circuit CCB08 (VT/WH) For Voltage
      G04684234Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts with the brake pedal applied? 

    Yes  : GO to B3.

    No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

  3. B3 CHECK THE SPEED CONTROL DEACTIVATOR SWITCH FOR CORRECT OPERATION 
    • While firmly applying and releasing the brake pedal, measure the voltage between the PCM C175b-47, circuit CES09 (VT/OG), harness side and ground.
      Fig 2: Checking Speed Control Deactivator Switch For Correct Operation
      G04684235Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts with the brake pedal released and 0 volts with the brake pedal firmly applied? 

    Yes  : GO to  B9.

    No  : GO to B4.

  4. B4 CHECK CIRCUIT CBP44 (VT) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Stoplamp Switch C278.
    • Key in ON position.
    • Measure the voltage between the stoplamp switch C278-2, circuit CBP44 (VT), harness side and ground.
      Fig 3: Checking Circuit CBP44 (VT) For Open
      G04684236Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Yes  : GO to B5.

    No  : VERIFY the battery junction box (BJB) fuse 44 (15A) is OK. If OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

  5. B5 CHECK CIRCUIT CES09 (VT/OG) FOR A SHORT TO VOLTAGE 
    • Measure the voltage between the stoplamp switch C278-3, circuit CES09 (VT/OG), harness side and ground.
      Fig 4: Checking Circuit CES09 (VT/OG) For Short To Voltage
      G04684237Courtesy of FORD MOTOR CO.
    • Is any voltage present? 

    Yes  : GO to B6.

    No  : GO to  B7.

  6. B6 CHECK THE ABS MODULE FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: ABS Module C135.
    • Key in ON position.
    • Measure the voltage between the stoplamp switch C278-3, circuit CES09 (VT/OG), harness side and ground.
      Fig 5: Checking ABS Module For Short To Voltage
      G04684238Courtesy of FORD MOTOR CO.
    • Is any voltage present? 

    Yes  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

    No  : GO to  B8.

  7. B7 CHECK CIRCUIT CES09 (VT/OG) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between the stoplamp switch C278-3, circuit CES09 (VT/OG), harness side and the PCM C175b-47, circuit CES09 (VT/OG), harness side.
      Fig 6: Checking Circuit CES09 (VT/OG) For Open
      G04684239Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes  : INSTALL a new stoplamp switch. REFER to EXTERIOR LIGHTING . CLEAR the DTCs. REPEAT the self-test.

    No  : GO to  B9.

  8. B8 CHECK FOR CORRECT ABS MODULE OPERATION 
    • Disconnect all the ABS module connectors.
    • Check for:
      • Corrosion
      • Pushed-out pins
    • Connect all the ABS module connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 

    Yes  : INSTALL a new ABS module. REFER to VEHICLE DYNAMIC SYSTEMS . CLEAR the DTCs. REPEAT the self-test.

    No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

  9. B9 CHECK FOR CORRECT PCM OPERATION 
    • Disconnect all the PCM connectors.
    • Check for:
      • Corrosion
      • Pushed-out pins
    • Connect all the PCM connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 

    Yes  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS - 2.3L or ELECTRONIC ENGINE CONTROLS - 3.0L (4V) . TEST the system for normal operation.

    No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

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