Cruise Control Disengaged

WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.

The powertrain control module (PCM) disengages the cruise control operation based on the information received from the throttle actuator control (TAC) module. The TAC module and the PCM monitor the signal circuits of the following switches:

The on/off switch
The TCC/brake switch
The stop lamp switch

The torque converter clutch (TCC) brake switch and the stop lamp switch are incorporated into an assembly and are mounted to the brake pedal bracket. Pressing the brake pedal while the cruise control is engaged will disengaged the Cruise Control System. The TAC module monitors the stop lamp switch signal circuit and the PCM monitors the TCC brake switch/cruise control release signal circuit. When the brake pedal is pressed, the normally closed TCC brake switch opens and the normally open stoplamp switch closes. The TAC module detects a high signal voltage on the stop lamp switch signal circuit and the PCM detects a low signal voltage on the TCC brake switch/cruise control release signal circuit. The TAC module sends a UART message to the PCM indicating the status of the stop lamp switch. The Cruise Control System will disengage when the cruise control on/off switch is turned OFF. The vehicle speed stored in the memory of the TAC module will be erased when the cruise control on/off switch is turned OFF, or the ignition switch is turned OFF.

The Cruise Control System will disengage when the PCM detects that the driver has the accelerator pedal override active for approximately 60 seconds.

When the Cruise Control System is disengaged, the PCM sends a class 2 message to the IPC in order to deactivate the cruise control indicator.