DTC P0703: Brake Switch B Input Circuit

WARNING: This page does not describe the selected car, but rather 25 other vehicles, including the 2012 Lincoln Navigator L, 2012 Lincoln Navigator, 2012 Lincoln MKZ, 2012 Lincoln MKX, and 2012 Lincoln MKT. However, it is still accessible from the selected car via links, so may be relevant.

P0703 - BRAKE SWITCH B INPUT CIRCUIT

Description: Indicates the PCM did not receive a brake pedal position (BPP) input.
Possible Causes: BPP circuit open or short Stoplamp circuits open or short Damage in module connected to the BPP circuit. Damaged brake switch Incorrectly adjusted brake switch
Diagnostic Aids: Check for correct function of the stoplamps. Using a scan tool, check the brake pedal position PID. The stoplamps and PID should turn ON and OFF with brake pedal activation.
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
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 appropriate Vehicle Dynamic Systems article.
All others	GO to PINPOINT TEST FD .