Cruise Control - Non Adaptive
Cruise Control - Non Adaptive
Overview
The cruise control system is controlled by the PCM (Powertrain Control Module).
The cruise control mode is selected from the steering wheel mounted switches (ON/OFF, SET, CNCL and RES) which are integrated into the LH (Left Hand) steering wheel switch.
The cruise control system maintains a selected vehicle speed between 29 kmh (18 mph) and the maximum limited vehicle speed. When a MyKey(R) restricted key is in use and max speed limiter is turned on, vehicle speed is limited to 128.7 kmh (80 mph).
During normal driving, the vehicle speed can vary slightly from the set speed due to road conditions. The vehicle speed can fluctuate when driving up and down a steep hill. If the vehicle speed decreases more than 16.1 kmh (10 mph) below the set speed, the cruise control disengages.
System Operation
System Diagram
Network Message Chart
Network Input Messages - IPC (Instrument Panel Cluster)
Network Input Messages - PCM (Powertrain Control Module)
Cruise Control Operation
The cruise control functions include:
- turning on the cruise control system.
- setting and maintaining the desired vehicle speed.
- accelerating the vehicle speed.
- coasting down to a lower speed.
- resuming the prior vehicle speed.
- turning off the cruise control system.
Hardwired inputs to the PCM (Powertrain Control Module) are:
- Digital TR (Transmission Range) sensor
- Stoplamp switch
- Cruise control deactivator switch (integral to the stoplamp switch)
- APP (Accelerator Pedal Position) sensor
Hardwired outputs of the PCM (Powertrain Control Module) are:
- ETB (Electronic Throttle Body) command
The vehicle speed is controlled by the PCM (Powertrain Control Module) through the ETC (Electronic Throttle Control) subsystem.
The cruise control system provides self-diagnostics. Cruise control is disabled anytime an error is detected in the system. No IPC (Instrument Panel Cluster) indicator or message center messages are displayed when faults occur. Fault codes are logged by the PCM (Powertrain Control Module) or SCCM (Steering Column Control Module).
An ETC (Electronic Throttle Control) system fault also causes the cruise control system to be disabled. In this case, an ETC (Electronic Throttle Control) system powertrain malfunction (wrench) warning indicator is displayed.
Additionally, certain conditions cause the cruise control system to deactivate:
- Transmission gear selector is put into a position other than D or OD
- Cruise control set speed is overridden with the accelerator pedal for a period longer than 5 minutes
- Cruise control switch is pressed or stuck longer than 2 minutes
- ABS (Anti-Lock Brake System) fault
Cruise Control Deactivation Event PIDs (Parameter Identifications)
NOTE: When recording deactivation event PIDs (Parameter Identifications), turn the cruise control OFF immediately after the deactivation event occurs to prevent recording additional deactivation events which do not apply to the fault present.
The PCM (Powertrain Control Module) has PIDs (Parameter Identifications) available, through the powertrain DataLogger, that indicate the event that caused the last cruise control deactivation. When the cruise control is turned ON, all current deactivation (or non-activation) conditions are recorded. When the cruise control is turned OFF, event recording stops. The recorded events are stored until the ignition is turned OFF.
The PCM (Powertrain Control Module) has 24 cruise control deactivation event PIDs (Parameter Identifications), identified as CRUISEOFF_00 through 24. The event PIDs (Parameter Identifications) should be read when deactivation or non-activation exists.
Cruise Control Indicator
The cruise control indicator, located in the IPC (Instrument Panel Cluster), illuminates gray to indicate the cruise control system is in standby mode. The cruise control indicator illuminates green to indicate the cruise control system is active.
Steering Wheel Switch Function
Pressing up (ON) and releasing the ON/OFF switch turns the cruise control system on. Pressing up (SET+) or down (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 1.6 kmh (1 mph) per press. If the respective switch is pressed and held, the vehicle speed continues to accelerate or decelerate until the switch is released.
Pressing down (OFF) 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 CNCL (CANCEL) switch puts the cruise control system into standby mode. Pressing the RES (RESUME) switch when the cruise control system is in standby mode causes the vehicle to accelerate to the last set 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.
To ensure the most accurate service information, portions of this procedure are under development and may not be immediately available at vehicle introduction.
Component Description
Steering Wheel Switches
The cruise control steering wheel mounted switches are momentary contact switches that toggle up and down for the switch state. The switches are an input to the SCCM (Steering Column Control Module).
Brake Switch
When the brake pedal is applied, an electrical signal from the stoplamp circuit to the PCM (Powertrain Control Module) deactivates the system. Under increased brake pedal effort, the cruise control deactivator switch opens and removes the ground signal from the PCM (Powertrain Control Module) input circuit, releasing the throttle immediately deactivating the system.