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 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
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 appropriate Exterior Lighting article, to diagnose all the stoplamps are inoperative.
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 .