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P0703 - Brake Switch B Input Circuit

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2008 Mercury Sable, 2008 Mercury Mountaineer, 2008 Mercury Milan, 2008 Mercury Mariner, and 2008 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
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 stoplamp. Using a scan tool, check the BPP PID. The stoplamp and PID should toggle on and off with brake pedal activation.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
Town Car   Verify the brake pedal was applied and released during the key on engine running (KOER) self-test. For additional concerns, refer to the EXTERIOR LIGHTING -- E-SERIES .
Expedition,
Navigator		   Verify the brake pedal was applied and released during the key on engine running (KOER) self-test. For additional concerns, refer to the ANTI-THEFT - PASSIVE ANTI-THEFT SYSTEM (PATS) -- E-SERIES .
All others   refer to PINPOINT TEST FD .
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