Brake Pressure Applied (BPA) Switch
NOTE:
The BPA switch is present on vehicles equipped with speed control.
All vehicles have a single BPA switch. A BPA switch provides a backup for the brake pedal position (BPP) switch. Normally, a brakes-applied signal from the BPP switch disengages the speed control. If the BPP switch signal is lost, the BPA switch then supplies the brakes-applied signal to the speed control system. The BPA switch signal is also used in the transmission strategy and the key on engine running (KOER) self-test.