Overview
The cruise control system is controlled by the PCM .
The cruise control mode is selected from the steering wheel mounted switches (ON/OFF, SET+, SET- and CAN/RES), which are integrated into the LH steering wheel switch.
The cruise control system maintains a selected vehicle speed between 29 kmh (18 mph) and the maximum limited vehicle speed. When a MyKey® restricted key is in use and max speed limiter is turned on, vehicle speed is limited to 129 kmh (80 mph).
During normal driving, the vehicle speed can vary slightly from the set speed due to road conditions. The vehicle speed can fluctuate when driving up and down a steep hill. If the vehicle speed decreases more than 16 kmh (10 mph) below the set speed, the cruise control disengages.
Cruise Control Operation
The cruise control functions include
- turning on the cruise control system.
- setting and maintaining the desired vehicle speed.
- accelerating the vehicle speed.
- coasting down to a lower speed.
- resuming the prior vehicle speed.
- turning off the cruise control system.
Hardwired inputs to the PCM are
- BPP switch assembly (contains the stoplamp switch and cruise control deactivator switch)
- APP sensor
- Digital TR sensor
Hardwired outputs of the PCM are
- Electronic Throttle Body (ETB) command
The vehicle speed is controlled by the PCM through the Electronic Throttle Control (ETC) subsystem.
The cruise control system provides self-diagnostics. Cruise control is disabled anytime an error is detected in the system. No IPC indicator or message center messages are displayed when faults occur. Fault codes are logged by the PCM or SASM .
An Electronic Throttle Control (ETC) system fault also causes the cruise control system to be disabled. In this case, an Electronic Throttle Control (ETC) system powertrain malfunction (wrench) warning indicator is displayed.
Additionally, certain conditions cause the cruise control system to deactivate
- Transmission gear selector is placed into a position other than D or OD
- Cruise control set speed is overridden with the accelerator pedal for a period longer than 5 minutes
- Cruise control switch is pressed or stuck longer than 2 minutes
- ABS fault
Normal Operation and Fault Conditions
Refer to
Refer to: STEERING WHEEL AND COLUMN ELECTRICAL COMPONENTS - SYSTEM OPERATION AND COMPONENT DESCRIPTION.
Refer to: CRUISE CONTROL - SYSTEM OPERATION AND COMPONENT DESCRIPTION (419-03 Cruise Control, Description and Operation).
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B112B:07 | Steering Wheel Module: Mechanical Failure | A DTC that sets when the BCM detects the steering wheel switch is not operating properly. |
| B112B:83 | Steering Wheel Module: Value of Signal Protection Calculation Incorrect | A DTC that sets when the BCM detects that all steering wheel switches are inoperative. |
DTC FAULT TRIGGER CONDITIONS
Refer to: CRUISE CONTROL - SYSTEM OPERATION AND COMPONENT DESCRIPTION (419-03 Cruise Control, Description and Operation).
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P0504 | Brake Switch A/B Correlation | A DTC that sets when the PCM does not sense the correct sequence of the brake pedal input signal from both the cruise control deactivator and brake pedal position switches when the brake pedal is applied and released. |
| P0572 | Brake Switch A Circuit Low | A DTC that sets when the PCM detects an open in the brake pedal position switch signal. The PCM monitors the vehicle speed, the engine speed, the engine torque and the stoplamp input during start and stop driving cycles. If the stoplamp switch input to the PCM is always off during start and stop driving cycles, this DTC sets in continuous memory. |
| P0573 | Brake Switch A Circuit High | A DTC that sets when the PCM detects a short to voltage on the brake pedal position switch signal. The PCM monitors the vehicle speed, the engine speed, the engine torque and the stoplamp switch input during start and stop driving cycles. If the stoplamp switch input to the PCM is always on during start and stop driving cycles, this DTC sets in continuous memory. |
| P1703 | Brake Switch Out Of Self - Test Range | A DTC that sets in the PCM during the self-test when the brake pedal position switch input signal is high or does not cycle high and low. |
DTC FAULT TRIGGER CONDITIONS
See also:
• CRUISE CONTROL
• DRIVER AIRBAG