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:

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

Hardwired output of the PCM is:

• 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 SASM.

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:

• 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
• ABS fault