Principles of Operation
The brake pedal position (BPP) switch is normally closed to ground. When the brake pedal is applied with the speed control system engaged, the BPP switch closes (to battery voltage), putting the speed control in stand-by mode.
NOTE:
A redundant brake deactivator (BPA) switch is provided as an additional safety feature.
NOTE:
The speed control module is integral to the powertrain control module (PCM).
The clockspring provides the electrical interface between the steering column wiring and the speed control switches in the steering wheel.
The inputs to the powertrain control module (PCM) required to operate the speed control system are the:
- anti-lock brake (ABS) module
- digital transmission range (TR) sensor
- speed control deactivator switch
- speed control switches
- vehicle speed signal (VSS)
The inputs to the speed control actuator come from the powertrain control module (PCM).
The outputs of the speed control actuator go to the speed control cable controlled throttle position sensor.