Parking Aid - System Operation and Component Description: Notes
System Operation
Parking Aid - Audible
System Diagram
| Item | Description |
|---|---|
| 1 | PCM |
| 2 | SOBDMC |
| 3 | GWM |
| 4 | FCIM |
| 5 | IPC |
| 6 | LH front outer sensor |
| 7 | LH front inner sensor |
| 8 | LH front inner sensor |
| 9 | RH front inner sensor |
| 10 | RH rear outer sensor |
| 11 | RH front outer sensor |
| 12 | RH rear inner sensor |
| 13 | LH rear inner sensor |
| 14 | Right front active sensor |
| 15 | Left front active sensor |
| 16 | Right rear active sensor |
| 17 | With front park assist |
| 18 | With side sensing |
| 19 | Rear door speakers |
| 20 | Front door speakers |
| 21 | BCM |
| 22 | ABS Module |
| 23 | ACM |
| 24 | DSP |
| 25 | Parking aid disable switch |
| 26 | Left rear active sensor |
| 27 | PAM |
| 28 | With Harman Revel® audio |
| 29 | Without Harman Revel® audio |
| 30 | HEV and PHEV only |
Network Message Chart
PAM Network Input Messages
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Ignition key type | BCM | Used to disable the parking aid menus if a MyKey® is in use |
| Ambient air temperature | PCM | Used to temperature compensate the parking aid sensors |
| Decklid ajar status | BCM | Used to indicate that the hood is opened. |
| Electrical power status | SOBDMC | Used to indicate if the engine is on (for HEV/ PHEV). |
| Power mode | BCM | Used to communicate the ignition switch state. |
| Parking aid enable request | IPC | Used to enable or disable the front or rear parking aid. |
| Wheel rotation count | ABS module | Used to disable and enable the parking aid system based on vehicle speed. |
ACM Network Input Messages
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Chime source | IPC | Used to command parking aid warning tones through the audio system speakers. |
DSP Network Input Messages
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Chime source | IPC | Used to command parking aid warning tones through the audio system speakers. |
IPC Network Input Messages
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Parking aid chime request | PAM | Used to command parking aid warning tones through the audio system speakers. |
| Parking aid enable status | PAM | Used to indicate to the IPC that the front or rear parking aid is enabled or disabled. |
| Parking aid status | PAM | Used to command parking aid warning tones through the audio speakers. |
| Parking aid sensor status | PAM | Used for parking aid status. |
Audible Parking Aid System Operation
The PAM calculates the distance to an object within a 170 degree semicircular area (azimuth) around the front and/or rear of the vehicle. When an object is detected by the front or rear parking aid system, a variable rate warning tone is sounded through the corresponding audio system speakers (front or rear door speakers).
The front and rear parking aid system is active until the vehicle speed reaches 12 km/h (7.5 mph). Once the vehicle speed reaches 12 km/h (7.5 mph), the front and rear parking aid system is disabled until the vehicle speed falls below 8 km/h (5 mph).
The rear parking aid system calculates the distance to an object around the rear of the vehicle using 4 ultrasonic sensors. The rear outer parking aid sensors can detect objects approximately 60 cm (24 in) from the rear of the vehicle. The rear inner parking aid sensors can detect objects approximately 180 cm (71 in) from the rear of the vehicle. Objects can also be detected by these sensors that are approximately 35 cm (14 in) to the side of the rear bumper. Objects must be 30 cm (12 in) above the ground to be detected by the rear parking aid system. 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.
This vehicle may also be equipped with a front parking aid system. 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 can detect objects approximately 70 cm (28 in) from the front of the vehicle. If the vehicle is equipped with Active Park Assist, the 2 front side sensors detect objects approximately 35 cm (14 in) to the side of the front bumper. Objects must be 30 cm (12 in) above the ground to be detected by the front parking aid system. 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. The 4 front sensors share common voltage and ground circuits.
Only objects that reflect a sufficient amount of sound waves are detected by the front or rear parking aid sensors. The surface properties, size and composition an object can affect the ability of the parking aid system to detect the object. Incorrect sensor alignment or installation, dirt or ice covered sensors, heavy rain and snow can also cause objects not to be detected.
Side Sensing
The side sensing system calculates the distance to an object around the sides of the vehicle using the four active parking aid sensors used for the active park assist. The side sensors detect objects approximately 60 cm (24 in) from the side of the vehicle. To detect objects on the sides of the vehicle, the PAM supplies voltage and ground to the front ultrasonic sensors while monitoring a signal return circuit from each sensor. The 2 front side sensors share common voltage and ground circuits with the front parking aid sensors. The 2 rear side sensors share common voltage and ground circuits with the rear parking aid sensors.
Parking Aid Audible Alert
Audio system volume is automatically reduced when a parking aid alert tone is sounded. The alert tone frequency increases as the vehicle gets closer to an obstacle. When an object is detected within 30 cm (12 in) of the sensors, the warning tone becomes continuous. Objects detected outside the continuous tone area to the side of the vehicle generate a warning tone for 3 seconds. The warning tones are prioritized to the closest object. If the front and rear objects are located the same distance from the vehicle, the rear object is prioritized.