LaCrosse V6-3.8L (2009)
Cruise Control Disengaged
The ECM/PCM disengages the cruise control operation based on the signals from one of the following:
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The brake pedal position (BPP) sensor
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The on/off switch
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The CANCEL switch
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 brake pedal position sensor signal circuit. The ECM detects a high voltage
signal on stop lamp switch signal circuit from the BCM indicating that the brake pedal has been pressed. For further information on the BPP, refer to
Exterior Lighting Systems Description and Operation (See: Lighting and Horns/Description and Operation/Exterior Lighting Systems Description and
Operation).
The Cruise Control System will also disengage when the cruise control cancel switch is activated. 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 a high signal voltage on the cruise control
cancel switch signal circuit and sends a serial data message to the ECM/PCM to disengage the cruise control system.
When the cruise control on/off switch is turned OFF, the Cruise Control System will disengage.
The Cruise Control System will also disengage when the ECM/PCM detects that a driver override function has been active for approximately 60
seconds.
When Cruise Control System has been disengaged, the ECM/PCM sends a serial data message to the instrument panel cluster (IPC) in order to turn off
the Cruise indicator.
The vehicle speed stored in memory will be erased when the cruise control On/Off switch is turned OFF, or the ignition switch is turned OFF.
Cruise Control Inhibited
The ECM/PCM inhibits the cruise control operation when any of the following conditions exist:
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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 within 9-16 volts.
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The Traction Control System (TCS) is active for more than 2 seconds.