Mariner 4WD L4-2.5L Hybrid (2009)
Brake Signal: Description and Operation
Brake Pedal Position (BPP) Switch
The BPP switch is a normally open switch that, when closed, sends a signal to the PCM when the brake pedal is applied. The PCM strategy uses this
signal input to aid the PCM in determining the correct function and operation of the vehicle speed control, the electronic throttle control (ETC), and the
transaxle and regenerative braking systems. The BPP switch is hard wired to the PCM and supplies positive battery voltage (+12 volts) when the brake
pedal is applied. When the brake pedal is released, the BPP switch opens and no battery voltage input is sent to the PCM.The PID name for this switch is
BOO1
Brake Pedal Switch (BPS)
The BPS used for vehicle speed control deactivation is a normally closed switch, which supplies positive battery voltage (+12 volts) to the PCM when
the brake pedal is released. When the brake pedal is applied, the normally closed switch opens and power is removed from the BPS circuit to the PCM.
The normally closed BPS, along with the normally open BPP switch, is used by the PCM strategy for a brake pedal rationality test. The PCM strategy
looks for each switch to change states when the brake pedal is applied and released. If a failure occurs in one or both of the brake pedal inputs a
diagnostic trouble code is set and the PCM misfire on board diagnostic (OBD) monitor is disabled.The PID name for this switch is BOO2
