DTC P0703: Brake Switch B Input Circuit

WARNING: This page does not describe the selected car, but rather 33 other vehicles, including the 2010 Mercury Mountaineer, 2010 Mercury Milan, 2010 Mercury Mariner, 2010 Mercury Grand Marquis, and 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

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 Incorrectly adjusted 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 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 ANTI-LOCK CONTROL/VEHICLE DYNAMIC SYSTEMS article .
All others	GO to PINPOINT TEST FD .