GM Service Manual Online
For 1990-2009 cars only
Cruise Control Active: Displays Yes or No. The status of the cruise engaged signal. The cruise control module grounds the circuit when cruise control is on.

Cruise Inhibit Reason: The scan tool displays the last cruise control disengage. There are 20 possible causes for cruise control disengagement.

Cruise Inhibit Signal Command: Displays ON or OFF. Indicates if the PCM is commanding the cruise control module to inhibit cruise control operation.