Parking Aid - System Operation and Component Description: Notes
System Operation
Parking Aid - Audible
System Diagram Without Active Park Assist
System Diagram With Active Park Assist
Network Message Chart
PAM Network Input Messages
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Outside air temperature | FCIM | Used to temperature compensate the parking aid sensors. |
| Gear lever position | TCM | Used to enable or disable the front or rear parking aid depending on the gear lever position. |
| Day/night status | BCM | Used to light compensate the parking aid sensors. |
| Ignition key type | BCM | Used to disable the parking aid switch when a MyKey® is in use. |
| Ignition status | BCM | Used to communicate the ignition switch state. |
| Illumination dimming level | BCM | Used to control the illumination brightness of the parking aid switch. |
| Rear parking aid enable/disable | IPC | Used to enable and disable to rear parking aid on vehicle with rear parking aid only. |
| Stability-traction control event in progress | ABS module | Disables the active park assist if a stability or traction control system activation occurs. |
| Stability-traction control indicator request | ABS module | Disables the active park assist if a stability or traction control system fault occurs. |
| Steering wheel angle | ABS module | Used to determine the current steering angle. |
| Trailer backup assist notification | IPMB | Deactivates the system if the PTBA system is active. |
| Trailer lamp connected | TRM | Deactivates the system if a trailer is connected |
| Vehicle configuration data | BCM | Used to determine the vehicle configuration. |
| Vehicle speed | PCM | Used to disable the parking aid if the vehicle speed exceeds a preset threshold. |
| Wheel speed data | ABS module | Used to confirm vehicle movement and calculate distance traveled during active park assist maneuvers. |
| Wheel rotation data | ABS module | Used to confirm wheel rotation during active park assist maneuvers. |
| Wheel rotation direction | ABS module | Used to confirm wheel rotation direction during active park assist maneuvers. |
IPC Network Input Messages
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Audio chime status | ACM | Used to provide audio chime status feedback to the IPC. |
| Parking aid chime request | PAM | Used to command parking aid warning tones through the IPC chime arbitrator. |
| Parking aid fault status | PAM | Use to indicate a parking aid fault. |
| Parking aid front status | PAM | Indicates the status of the front parking aid. |
| Parking aid text message | PAM | Used to provide parking aid information for the message center. |
| Parking aid rear status | PAM | Indicates the status of the rear parking aid. |
| Parking aid sensor blockage | PAM | Used to display a message that a parking aid sensor is blocked. |
| Parking aid sensor data | PAM | Provides data on the parking aid sensors. |
ACM Network Input Messages
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| IPC chime request | IPC | The request to turn on the parking aid chime comes in this message. |
DSP Network Input Messages
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| IPC chime request | IPC | The request to turn on the parking aid chime comes in this message. |
Audible Parking Aid System Operation
The rear parking aid system calculates the distance to an object around the rear of the vehicle using 4 ultrasonic sensors. The rear parking aid sensors detect objects approximately 180 cm (70 in) from the rear of the vehicle, 50 cm (20 in) from the rear side of the vehicle, and 30 cm (12 in) above the ground. To detect objects behind the vehicle, the PAM supplies voltage and ground to the rear ultrasonic sensors while monitoring a signal return circuit from each sensor. The 4 rear sensors share common voltage and ground circuits.
The front parking aid system calculates the distance to an object around the front of the vehicle using 4 ultrasonic sensors. The front parking aid sensors detect objects approximately 70 cm (27 in) from the front of the vehicle, 50 cm (20 in) from the front side of the vehicle, 30 cm (12 in) above the ground. To detect objects in front of the vehicle, the PAM supplies voltage and ground to the front ultrasonic sensors while monitoring a signal return circuit from each sensor.
Only objects that reflect a sufficient amount of sound waves are detected by the parking aid sensors. The surface properties, size and composition of an object can affect the ability of the parking aid system to detect the object.
Parking aid operation may also be affected by:
- Improper sensor installation or alignment
- Dirt or ice covered sensors
- Heavy rain or snow
The parking aid system detects objects under the following conditions:
- The vehicle is in REVERSE (rear parking aid).
- The vehicle is in motion in any gear except NEUTRAL (front parking aid and side sensing system, if equipped).
- The vehicle is moving toward the object.
- The vehicle is stationary and the object is moving toward the vehicle.
- The vehicle and object are both moving toward one another.