total of 16 km/h (10 mph) over the current set vehicle speed. Momentarily activating the resume/accel switch,
after the Cruise Control System has been disengaged by pressing the brake pedal, will recall the previous set
vehicle speed that is recorded in the TAC module.
Cruise Control Disengaged
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:
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The on/off switch
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The TCC/brake switch
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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.
Cruise Control Inhibited
The powertrain control module (PCM) inhibits the cruise control operation when any of the following
conditions exist:
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A Cruise Control System related DTC has been set.
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The vehicle speed is less than 40 km/h (25 mph).
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The vehicle is in PARK, REVERSE, NEUTRAL, or 1st gear.
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The engine RPM is too low.
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The engine RPM is too high.
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The vehicle speed is too high.
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The system voltage is not between 6 volts and 16 volts.
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The Anti-lock Brake System/Traction Control System is active for more than 2 seconds.
2004 Hummer H2
2004 ACCESSORIES & EQUIPMENT Cruise Control - Hummer H2