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:

• Digital TR  sensor
• Brake pedal position switch
• Cruise control deactivator switch (integral to the brake pedal position switch)
• APP  sensor

Hardwired outputs from the PCM are:

• ETB  command

The vehicle speed is controlled by the PCM through the ETC  subsystem.

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

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

• Application of the parking brake
• 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 fault