Rear Park Assist: Notes
DESCRIPTION
The Rear Park Assist (RPA) system is comprised of the following components:
| 1. | Refer to: INSTRUMENT PANEL CLUSTER (IPC) . |
| 2. | Refer to: RADIO . |
| 3. | Refer to: BODY CONTROL MODULE (BCM) . |
| 4. | Refer to: INTEGRATED CENTER STACK (ICS)1 . |
| 5. | Refer to: PARK ASSIST MODULE (PAM) . |
| 6. | Refer to: PARK ASSIST SENSORS (PAS) . |
The RPA System detects objects located behind the vehicle within defined coverage zones. When an object is detected, the RPA System provides an alert to the customer based on the selected customer configuration and the object's location and distance relative to the vehicle. The system assists the driver during parking by sensing obstacles situated outside the driver's field of view.
The information regarding the presence and distance of an obstacle is transmitted to the driver in the form of an audible alert through the radio and a and graphic display on the IPC. The audible alert is pulsed at a rate dependent on distance to the obstacle.
OPERATION
Each time the park assist OFF switch is depressed the switch bank pod circuitry sends an electronic switch status message input to the BCM over the Controller Area Network - Interior High Speed (CAN-IHS) data bus. The BCM then relays an electronic switch request message to the PAM. The PAM responds to each switch request message by toggling the status of the appropriate Park Assist System (PAS) feature from enabled to disabled, or from disabled to enabled, then sends an electronic system status message back to the BCM over the CAN-IHS data bus as confirmation.
The BCM responds to the system status message by sending a message to the ICS over the CAN data bus to control the park assist Light Emitting Diode (LED) units so that they are illuminated only when appropriate while the status of the ignition is ON, and are extinguished when the status of the ignition is anything except ON. If the PAS is disabled due to a monitored fault or failure, a press of the park assist OFF push button will result in the LED flashing on and off for about 5 seconds, then lighting solid.
OPERATING CONDITIONS
- The PAS is active only when the ignition switch is in the ON or START positions and the transmission (manual or automatic) is in one of the following:
- REVERSE gear position and the vehicle speed is less than 11 km/h (7 mph).
- DRIVE or a forward gear position and the vehicle speed is less than 9 km/h (6 mph) on deceleration.
- DRIVE or a forward gear position and the vehicle speed is less than 11 km/h (7 mph) on acceleration.
The PAS is enabled from the factory as a default but can be disabled or enabled by pressing the defeat switch in the Integrated Center Stack (ICS).
DISABLE FEATURE - When the system is disabled, a PARK ASSIST OFF textual message will appear within the IPC display of the instrument cluster whenever the gear selector lever is in the REVERSE position.
When the PAM monitors a problem in any of the PAS circuits or components, it stores a fault code or Diagnostic Trouble Code (DTC) in its memory circuit, sends an electronic message to the IPC, and a SERVICE PARK ASSIST SYSTEM textual message is displayed in the IPC display.
When the PAS button is pressed to ON, the ICS sends an output signal to the BCM. The BCM then relays an electronic switch request message to the PAM over the CAN data bus. The PAM responds to each switch request message by toggling the status of the appropriate PAS feature from enabled to disabled, or from disabled to enabled, then sends an electronic system status message back to the BCM over the CAN data bus as confirmation.