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 vehicle speed.
• turning off the cruise control system.

Hardwired inputs to the Powertrain Control Module (PCM) are:

• Digital Transmission Range (TR) sensor
• Stoplamp switch
• Cruise control deactivator switch (integral to the stoplamp switch)
• Accelerator Pedal Position (APP) sensor

Hardwired outputs of the Powertrain Control Module (PCM) are:

• Electronic Throttle Body (ETB) command

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

The cruise control system provides self-diagnostics. Cruise control is disabled anytime an error is detected in the system. No Instrument Panel Cluster (IPC) indicator or message center messages are displayed when faults occur. Fault codes are logged by the Powertrain Control Module (PCM) or Steering Column Control Module (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 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
• Anti-Lock Brake System (ABS) fault