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Pinpoint Test A: DTC B1483 - Brake Pedal Input Open Circuit

CAUTION: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.
  1. A1 CHECK THE STOPLAMPS 
    • Apply the brake pedal while observing the stoplamps.
    • Do the stoplamps illuminate? 
    1. YES  : Go to  A2.
    2. NO  : REFER to EXTERIOR LIGHTING article to continue diagnosis of the stoplamps.
  2. A2 CHECK THE VOLTAGE TO THE ABS MODULE 
    • Key in OFF position.
    • Disconnect: ABS Module C135
    • Key in ON position.
      • Fig 1: Checking Voltage To ABS Module
      GF0041425Courtesy of FORD MOTOR CO.
    • Measure the voltage between ABS module C135-6, circuit CES09 (VT/OG), harness side and ground with the brake pedal not pressed.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  A6.
    2. NO  : Go to  A3.
  3. A3 CHECK CIRCUIT CES09 (VT/OG) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: BPP Switch C278
      • Fig 2: Checking Circuit CES09 (VT/OG) For An Open
      GF0041426Courtesy of FORD MOTOR CO.
    • Measure the resistance between ABS module C135-6, circuit CES09 (VT/OG), harness side and BPP switch C278-3, circuit CES09 (VT/OG), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A4.
    2. NO  : REPAIR circuit CES09 (VT/OG). CLEAR the DTC. REPEAT the self-test.
  4. A4 ISOLATE THE BPP SWITCH 
    • Measure the resistance between BPP switch C278 pin-2 and pin-3, component side, while pressing and releasing the brake pedal.
    • Is the resistance greater than 10,000 ohms with the pedal pressed and less than 5 ohms with the pedal released? 
    1. YES  : Go to  A5.
    2. NO  : INSTALL a new BPP switch. REFER to Stoplamp Switch in EXTERIOR LIGHTING article. CLEAR the DTC. REPEAT the self-test.
  5. A5 CHECK THE VOLTAGE TO THE BPP SWITCH 
    • Key in ON position.
      • Fig 3: Checking Voltage To BPP Switch
      GF0041427Courtesy of FORD MOTOR CO.
    • Measure the voltage between BPP C278-2, circuit CBP49 (VT/GY), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  A6.
    2. NO  : VERIFY BJB fuse 49 (15A) is OK. If OK, REPAIR circuit CES09 (VT/OG). CLEAR the DTCs. REPEAT the self-test.
  6. A6 CHECK FOR CORRECT ABS MODULE OPERATION 
    • Check ABS module C135 for:
      • corrosion.
      • pushed-out pins.
      • spread terminals.
    • Connect: ABS Module C135
    • Make sure the connector seats correctly, then operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module . CLEAR the DTCs. REPEAT the self-test.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
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