DTC P0703: Brake Switch Circuit Input Malfunction

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2005 Mercury Sable, 2005 Mercury Mountaineer, 2005 Mercury Monterey, 2005 Mercury Montego, and 2005 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.

P0703 - BRAKE SWITCH CIRCUIT INPUT MALFUNCTION

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 (rear electronic module [REM] for Freestar/Monterey, LS, and Thunderbird or lighting control module [LCM] for Town Car). Damaged brake switch Misadjusted brake switch
Diagnostic Aids:	Check for proper function of the stoplamps. Using a diagnostic 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
Freestar/Monterey, Town Car	Verify the brake pedal was applied and released during the key on engine running (KOER) self-test. For additional concerns, Refer to 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 ANTI-LOCK CONTROL .
All others	GO to FD: Brake Pedal Inputs STEP FD2.	GO to FD: Brake Pedal Inputs STEP FD1.	GO to FD: Brake Pedal Inputs STEP FD2.