F 150 2WD Pickup V8-4.6L (2002)
Brake Light Switch: Description and Operation
Brake Pedal Position Switch
Brake Pedal Position Switch
Typical Brake Pedal Position Switch
The Brake Pedal Position (BPP) switch (Figure 21) is used by the PCM to disengage the transmission torque converter clutch and on some
applications as an input to the idle speed control for idle quality and for vehicle speed control deactivation. On most applications the BPP switch is
hard wired to the PCM and supplies battery positive voltage (B+) when the vehicle brake pedal is applied. On other applications the BPP switch signal
is broadcast over the SCP link via another module to be received by the PCM.
On applications where the BPP switch is hard wired to the PCM and stoplamp circuit, if all stoplamp bulbs are burned out (open), high voltage is
present at the PCM due to a pull-up resistor in the PCM. This provides fail-safe operation in the event the circuit to the stoplamp bulbs has failed.
