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DTC P0703: Brake Switch B Input Circuit

P0703 - BRAKE SWITCH B INPUT CIRCUIT

Description:  Indicates the powertrain control module (PCM) did not receive a brake pedal position (BPP) input.
Possible Causes: 
  • Open or short in the BPP circuit
  • Open or short in the stoplamp circuits
  • Damage in module(s) connected to the BPP circuit.
  • Damaged brake switch
  • Misadjusted brake switch
Diagnostic Aids:  Check for proper function of the stoplamps. Using a diagnostic tool, check the BPP PID. The stoplamps and PID should toggle on and off with brake pedal activation.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
Freestar/Monterey, Town Car Verify the brake pedal was applied and released during the key on engine running (KOER) selftest. For additional concerns, refer to the appropriate EXTERIOR LIGHTING article .
Expedition, Navigator Verify the brake pedal was applied and released during the key on engine running (KOER) selftest. For additional concerns, refer to the appropriate VEHICLE DYNAMIC SYSTEMS article .
All others GO to Pinpoint Test FD .
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