Cruise Control Operation: Notes

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 speed.
• turning off the cruise control system.

The cruise control system maintains a selected vehicle speed within a range between 32 kph (20 mph) or 30 kph (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:

• application of the EPB.
• transmission gear selector is placed into a position other than Drive.
• 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.
• vehicle speed decreases more than 16 kph (10 mph) below the set speed.
• ABS fault.

Electronic Throttle Body (ETB) command is an output of the PCM.

Vehicle speed is controlled by the PCM through the ETB subsystem.

The cruise control system provides self-diagnostics. Cruise control is disabled when an error is detected in the system. No IPC indicator or message center messages are displayed when faults occur. Fault codes are logged by the PCM or SCCM.

An ETB system fault also causes the cruise control system to be disabled. In this case, an ETB system powertrain malfunction (wrench) warning indicator is displayed.