System Operation

Active Park Assist

System Operation

System Diagram





Network Message Chart

PAM (Parking Aid Module) Network Input Messages





APIM (Accessory Protocol Interface Module) Network Input Messages





ACM (Audio Control Module) Network Input Messages





PSCM (Power Steering Control Module) Network Input Messages






Active Park Assist System

NOTE: Refer to the Owner's Literature for active park assist and graphical centerstack infotainment displays.

NOTE: Aftermarket or modified audio systems may disable necessary audible warnings.

The PAM (Parking Aid Module) communicates with several modules to control the functions of the active park assist system.

When the active park assist switch is pressed, the centerstack infotainment display displays the message "Searching for parking space on left/right side." The multifunction switch turn signal input is used to determine the side of vehicle in which the driver is searching for a parking space. If the turn signal is not selected, the active park assist system defaults to searching on the passenger side of the vehicle.

The system measures the available parking spaces and its surroundings as the operator drives by to determine if the vehicle can be maneuvered into the available parking space. The minimum parking space length that the active park assist system identifies is approximately 1.2 times the length of the vehicle and is determined by inputs from the active park assist sensors and the wheel rotation data.

Once a parking space is located, the centerstack infotainment display displays "Parking space found on left/right side. Pull forward to park." followed by an audible chime from the ACM (Audio Control Module). The operator pulls the vehicle forward and the centerstack infotainment display displays the message "Parking space found on left/right side. Stop vehicle to park." Once the operator has stopped the vehicle, the centerstack infotainment display displays the message "Remove hands from steering wheel. Shift to (R) to park on left/right side." then the message "Parking on left/right side. Back up slowly." The active park assist system takes control of the steering when the transmission is placed in REVERSE (R) and no steering wheel operator input torque is detected by the PSCM (Power Steering Control Module). The operator has full control of gear-shifting, the accelerator and the brake pedal.

When the vehicle has backed close to the vehicle behind, the message, "Pull forward slowly." is displayed and the active park assist system continues to control the steering as the operator moves the vehicle forward. The active park assist system may offer subsequent backward and forward maneuvers (and similar messages) before finalizing the parking sequence.

The PAM (Parking Aid Module) determines that the active park maneuvers are completed based on the final vehicle alignment. The vehicle should be located approximately 0 to 304.8 mm (12 in) from the street curb if a curb is detected, otherwise the system aligns the vehicle to the front vehicle. The centerstack infotainment display displays the message "Active Park Assist Finished" followed by an audible chime from the ACM (Audio Control Module).

Pressing and releasing the active park assist switch at anytime disables the active park assist system. If the system is disabled by the operator after the system starts to control the steering, the centerstack infotainment display displays the message "Active Park Assist Cancelled" or "Active Park Assist Deactivated" followed by a warning chime.

The active park assist system utilizes steering angle inputs, vehicle wheel roll count, wheel direction, active park assist sensor inputs, vehicle speed and transmission selection to calculate vehicle position and distance in relation to the parking space. The inputs are used by the PAM (Parking Aid Module) to command the steering system to assist with the steering wheel control to maneuver the vehicle into the parking space.

The rear parking aid sensors are used to detect a vehicle or object located behind the vehicle in the parking space. The rear parking aid system sounds a continuous tone when the rear bumper of vehicle is approximately 304.8 mm (12 in) from the vehicle to the rear and the message in the centerstack infotainment display displays "Stop vehicle. Pull forward slowly." followed by an audible chime from the ACM (Audio Control Module).

If an input module fault or other system malfunction is present, the active park assist system is disabled or prevents the system from activating. The message "Active Park Assist Fault" is displayed in the centerstack infotainment display and a DTC (Diagnostic Trouble Code) is set in the PAM (Parking Aid Module).

Certain conditions can cause the active park assist system to incorrectly align the vehicle in the selected parking space:

- A spare tire or one of the vehicles tires has significantly more or less tread wear than the other tires.

- The vehicle has been equipped with various accessories (cycle rack, trailer) which are not recognized by the active park assist system.

- The factory-installed tire sizes are not used on the vehicle.

- Poor weather conditions such as heavy rain or snow exist.

- The active park assist sensors are damaged or obstructed.

- The curb along the parking space is irregular.

- The vehicle or objects bordering the space are not be positioned correctly. The system aligns the vehicle to the front vehicle and the driving angle when the curb is not detected.

- The parking space length or parked objects position have changed after the vehicle has passed the parking space.

- The temperature around the vehicle changes quickly such as the vehicle driven from a heated garage into the cold or just leaving a car wash before the system was used.

- One of the parked vehicles has a high attachment, such as a salt spreader or moving truck bed, that the sensors cannot detect.

Electronic Power Assist Steering (EPAS) Control

The EPAS (Electronic Power Assist Steering) gear assembly is used to control the steering portion of the active park assist system. The gear assembly is comprised of an electrically controlled power rack assembly and a PSCM (Power Steering Control Module).

Active Park Assist Message Display

Active park assist messages are displayed in the centerstack infotainment display.

Conditions that cause the active park assist system to be cancelled (and the corresponding display/chime) are: