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 are:

• TR sensor
• BPP switch assembly (contains the stoplamp switch and cruise control deactivator switch)
• APP sensor

Hardwired outputs of the PCM are:

• Electronic Throttle Body (ETB) command

The vehicle speed is controlled by the PCM through the Electronic Throttle Control (ETC) subsystem.

The cruise control system maintains a selected vehicle speed within a range between 32 km/h (20 mph) or 30 km/h (18 mph) 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 noticably when driving up and down steep hills.

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. Fault codes are logged by the PCM or SCCM.

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

Additionally, certain conditions cause the cruise control system to deactivate:

• Transmission gear selector is placed 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
• Vehicle speed decreases more than 16 km/h (10 mph) below the set speed
• ABS fault
• Traction or stability control event