Principles of Operation

Cruise Control

Principles of Operation

NOTE: The Smart Junction Box (SJB) is also known as the Generic Electronic Module (GEM).

The cruise control system is designed to maintain a selected vehicle speed between 48 km/h (30 mph) and the maximum limited vehicle speed. The cruise control module is integral to the cruise control actuator.

Whenever the system is engaged and active, a message from the SJB is sent over the High Speed Controller Area Network (HS-CAN) to the Instrument Cluster (IC) to illuminate a cruise control set indicator in the IC.

The stoplamp switch is a double pole, double throw switch. It is normally closed to ground. When the brake pedal is applied with the cruise control system engaged, the stoplamp switch opens to ground and sends voltage to the cruise control actuator, putting the cruise control in stand-by mode.

The cruise control deactivator switch is used as a redundant signal to the cruise control actuator to disable the cruise control when the brake pedal is firmly pressed. The switch is normally closed, and opens when the brake pedal is firmly pressed.

On vehicles equipped with a manual transmission, the Clutch Pedal Position (CPP) switch is used to indicate to the cruise control actuator when the clutch pedal is engaged. The switch is normally closed, and opens when the clutch pedal is engaged.

The clockspring provides the electrical interface between the steering column wiring and the cruise control switches in the steering wheel.

The inputs to the cruise control actuator are the:

- Vehicle speed signal
- Cruise control switches
- Stoplamp switch
- CPP switch
- Cruise control deactivator switch

The outputs of the cruise control actuator are the:

- Cruise control indicator
- Cruise control cable controlled throttle position