System Operation
Non-Adaptive Cruise Control
Item | Description |
---|---|
1 | Brake switch assembly |
2 | IPC |
3 | Accelerator pedal |
4 | Deactivator switch |
5 | Stoplamp switch |
6 | SCCM |
7 | PCM |
8 | Cruise control switches |
9 | GWM |
10 | ABS module |
11 | RCM |
12 | Steering Effort Control Module (SECM) (adaptive steering) |
13 | SASM (adaptive steering) |
14 | SIMA |
Network Message Chart
Network Input Messages - IPC
Broadcast Message | Originating Module | Message Purpose |
---|---|---|
Cruise control override | PCM | Driver overriding cruise control with accelerator pedal. |
Cruise control status | PCM | Data used for speed control indicator status. |
Cruise control set speed | PCM | Data used to display the driver selected vehicle speed |
Network Input Messages - PCM
Broadcast Message | Originating Module | Message Purpose |
---|---|---|
Cruise control switch commands | SIMA | Used for cruise control enable/disable and operating mode request. |
Stability control event in progress | ABS module | Deactivates speed control when requested. |
Traction control event in progress | ||
Vehicle lateral acceleration | RCM | Deactivates speed control when requested. |
Vehicle longitudinal acceleration | ||
Vehicle yaw rate |
Network Input Messages - SIMA
Broadcast Message | Originating Module | Message Purpose |
---|---|---|
Cruise control switch commands | SIMA | Used for cruise control switch enable/disable and operating mode commands. |
Cruise Control Operation
The cruise control functions include:
The cruise control system maintains a selected vehicle speed within a range between 32 km/h (20 mph) or 30 km/h (18 mph) if equipped with a metric cluster and the maximum limited vehicle speed. When a MyKey® restricted key is in use, the vehicle speed will not exceed the MyKey® maximum limited speed. During normal driving conditions, the vehicle speed can fluctuate slightly from the selected set speed due to road conditions. The vehicle speed can fluctuate more noticeably when driving up and down steep hills.
Certain conditions cause the cruise control system to deactivate:
The stoplamp switch assembly contains the stoplamp switch along with the cruise control deactivator switch. The APP sensor and stoplamp switch are hardwired inputs to the PCM.
The vehicle speed is controlled by the PCM.
The cruise control system provides self-diagnostics. Cruise control is disabled anytime an error is detected in the system. No IPC indicator or message center messages are displayed when faults occur. Cruise control switch fault codes are logged by the SIMA.
Cruise Control Indicator
The cruise control indicator, located in the IPC message center, illuminates to indicate the cruise control system is active.
Steering Wheel Switch Function
Cruise control switch inputs are received by the SIMA and sent through the SASM (vehicles with adaptive front steering) or the SCCM (vehicles without adaptive front steering) on the HS-CAN2 and then to the PCM on the HS-CAN2.
The cruise control switches are located at the lower left and lower right of the steering wheel. Cruise ON/OFF along with SET+/SET- are located on the lower left. CANCEL and RESUME are located on the lower right. All cruise control switch inputs are hardwired to the SIMA. The SIMA is located at the upper left steering wheel switch.
Pressing and releasing the steering wheel cruise control ON switch turns the cruise control system on and the cruise control icon illuminates in the message center. Pressing and releasing the steering wheel cruise control OFF switch turns the cruise control system off. Pressing SET+ or SET- on the SET switch while the vehicle is traveling at the desired speed activates the cruise control system.
Pressing up or down on the SET switch while in the active mode increases or decreases the maintained vehicle speed by 1 km/h per press when displayed units are km/h and 1 mph per press when displayed units are mph. If the respective switch is pressed and held, the vehicle speed continues to accelerate or decelerate until the switch is released.
Pressing and releasing the ON/OFF switch or turning the ignition switch to the off position, turns the cruise control system off. While the cruise control system is active, applying the brake pedal or pressing the CANCEL switch puts the cruise control system into standby mode. Pressing the RESUME switch when the cruise control system is in standby mode causes the vehicle to accelerate to the last speed. Resume does not function if the off switch is pressed, the ignition switch is cycled off or if the current vehicle speed is below the minimum operational speed.
Steering Wheel Switches
The cruise control steering wheel mounted switches are momentary contact switches that toggle up and down for the switch state. On vehicles without adaptive steering, the switches are an input to the SIMA then to the SCCM. On vehicles with adaptive steering, the switches are an input to the SIMA then to the SASM. The SECM acts as a pass through that sends switch data to the SASM (part of the clockspring assembly).
Brake Switch
When the brake pedal is applied, the cruise control deactivator switch, integrated in the stoplamp switch, opens and removes the ground signal from the PCM input circuit releasing the throttle, immediately deactivating the cruise control system.
The intelligent access key must be within 3 ft (1 m) of the door or luggage compartment you intend to lock or unlock.
At a Door
Electronic door handles are on each door. Gently depress the switch inside the exterior door handle to unlock and open the door. An unlock symbol illuminates on the door window trim indicating your vehicle is unlocked.