Lucerne V6-3.8L (2007)
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The cruise control cancel switch
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The cruise control on/off switch
The body control module (BCM) determines when the cruise control cancel switch is activated. When the normally open cancel switch is closed, the
BCM detects the predetermined voltage signal on the cruise control function switch circuit. The BCM sends a GMLAN serial data message to the PCM
in order to disengage the cruise control system.
The BPP sensor is mounted on the brake pedal bracket. Pressing the brake pedal while the cruise control is engaged will disengage the Cruise Control
System. The body control module (BCM) monitors the BPP sensor via the BPP sensor signal circuit as the voltage signal increases while the pedal
reaches the fully applied position. The BCM sends a GMLAN serial data message to the PCM indicating the position of the brake pedal. For further
information on the BPP sensor, refer to Exterior Lighting Systems Description and Operation and Brake Pedal Position Sensor Calibration.
The Cruise Control System will disengage when the cruise control on/off switch is switched OFF.
The Cruise Control System will disengage when the PCM detects that a driver override function has been active for approximately 60 seconds.
When the Cruise Control System has been disengaged, the PCM sends a GMLAN serial message to the instrument panel cluster (IPC) in order to turn
OFF the Cruise Engaged indicator.
The vehicle speed stored in the memory of the PCM will be erased when the cruise control on/off button is turned OFF, or the ignition switch is turned
OFF.
Cruise Control Inhibited
The powertrain control module (PCM) inhibits the cruise control operation when any of the following conditions exist:
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The PCM has not detected a brake pedal activation from the body control module (BCM).
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A Cruise Control System DTC has been set.
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The vehicle speed is less than 40.2 km/h (25 mph).
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The vehicle speed is too high.
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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 system voltage is not between 9-16 volts.
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The Antilock Brake System (ABS)/Traction Control System (TCS) is active for more than 2 seconds.