GM Service Manual Online
For 1990-2009 cars only
Cruise Control Active : Displays Yes / No. Indicates that the PCM has seen a transtion in the engaged circuit.

Cruise Inhibit Signal Command: Displays On / Off. Indicates if the PCM is commanding the cruise control module to inhibit cruise control operation because of a non cruise control event or the vehicle parameters are out of the cruise control enable criteria.

TCC Brake Pedal Switch: Displays Released/Applied. Indicates the current state of the TCC Brake pedal switch circuit. A closed switch (brake pedal released) indicates B+ voltage on the signal circuit. When you apply the vehicle brakes, the scan tool displays Applied. The tourque converter clutch and cruise control disengage. When you release the brake pedal the scan tool displays Released. This allows the cruise control to be resumed and the tourque converter clutch to engage