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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 2007 Lincoln MKX and 2007 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. B1 CHECK THE OPERATION OF THE STOPLAMP 
    • Key in ON position.
    • Operate the stoplamp.
    • Do the stoplamp operate correctly? 
    1. YES  : Go to  B2.
    2. NO  : REFER to EXTERIOR LIGHTING .
  2. B2 CHECK CIRCUIT CCB08 (VT/WH) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: PCM C175b
    • Key in ON position.
      • Fig 1: Measuring Voltage Between PCM C175B-46, Circuit CCB08 (VT/WH), Harness Side & Ground
      GF0030199Courtesy of FORD MOTOR CO.
    • While applying the brake pedal, measure the voltage between the PCM C175b-46, circuit CCB08 (VT/WH), harness side and ground.
    • Is the voltage greater than 10 volts with the brake pedal applied? 
    1. YES  : Go to  B3.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  3. B3 CHECK THE SPEED CONTROL DEACTIVATOR SWITCH FOR CORRECT OPERATION 
      Fig 2: Measuring Voltage Between PCM C175B-47, Circuit CES09 (VT/OG), Harness Side & Ground
      GF0023008Courtesy of FORD MOTOR CO.
    • While firmly applying and releasing the brake pedal, measure the voltage between the PCM C175b-47, circuit CES09 (VT/OG), harness side and ground.
    • Is the voltage greater than 10 volts with the brake pedal released and 0 volts with the brake pedal firmly applied? 
    1. YES  : Go to  B7.
    2. NO  : Go to  B4.
  4. B4 CHECK CIRCUIT CBB32 (GN/VT) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Stoplamp Switch C2064
    • Key in ON position.
      • Fig 3: Measuring Voltage Between Stoplamp Switch C2064-2, Circuit CBB32 (GN/VT) & Ground
      GF0023009Courtesy of FORD MOTOR CO.
    • Measure the voltage between the stoplamp switch C2064-2, circuit CBB32 (GN/VT), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  B5.
    2. NO  : VERIFY the battery junction box (BJB) fuse 32 (10A) 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 
      Fig 4: Measuring Voltage Between Stoplamp Switch C2064-3, Circuit CES09 (VT/OG) & Ground
      GF0023010Courtesy of FORD MOTOR CO.
    • Measure the voltage between the stoplamp switch C2064-3, circuit CES09 (VT/OG), harness side and ground.
    • Is any voltage present? 
    1. YES  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : Go to  B6.
  6. B6 CHECK CIRCUIT CES09 (VT/OG) FOR AN OPEN 
    • Key in OFF position.
      • Fig 5: Measuring Resistance Between Stoplamp Switch C2064-3, Circuit CES09 (VT/OG) & PCM C175B-47
      GF0023011Courtesy of FORD MOTOR CO.
    • Measure the resistance between the stoplamp switch C2064-3, circuit CES09 (VT/OG), harness side and the PCM C175b-47, circuit CES09 (VT/OG), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new stoplamp switch. REFER to EXTERIOR LIGHTING . CLEAR the DTCs. REPEAT the self-test.
    2. NO  : Go to  B7.
  7. B7 CHECK FOR CORRECT PCM OPERATION 
    • Disconnect all the PCM connectors.
    • Check for:
      • corrosion
      • damaged pins
      • 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? 
    1. YES  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS . TEST the system for normal operation.
    2. 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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