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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Powertrain DTC Charts & Descriptions (Except Diesel & Hybrid) >> DTC Diagnosis >> DTC P0703: - Brake Switch B Input Circuit

DTC P0703: - Brake Switch B Input Circuit

DTC 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 correct function of the stoplamps. Using a scan 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 
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 .
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) service information.
All others GO to Pinpoint Test FD .
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