Parking Aid - Audible
Network Message Chart
Parking Aid Module (PAM) Network Input Messages
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Power mode | BCM | Used to communicate the ignition switch position. |
| Parking aid enable status | IPC | Used to enable and disable the audible parking aid based on driver input through the message center. |
| Selector lever (PRNDL) position | PCM | Used to enable the rear parking aid when the selector lever is placed in reverse. Also used to disable the front parking aid when the selector lever is placed in park or neutral. |
| Vehicle speed | ABS module | Used to disable the front and/or rear audible parking aid if the vehicle speed exceeds preset thresholds. |
Audio Control Module (ACM) Network Input Messages
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Tone request | Parking Aid Module (PAM) | Used to command the parking aid sounder tones through the front and/or rear speakers. |
Audible Parking Aid Operation
The rear parking aid system uses 3 ultrasonic sensors to calculate the distance to an object around the rear of the vehicle. The rear parking aid sensors detect objects approximately 1, 524 mm (60 in) from the rear of the vehicle, 508 mm (20 in) from the rear side of the vehicle, and 304.8 mm (12 in) above the ground. To detect objects behind the vehicle, the Parking Aid Module (PAM) supplies voltage and ground to the rear ultrasonic sensors while monitoring a signal return circuit from each sensor. The 3 rear sensors share common voltage and ground circuits.
The front parking aid system uses 4 ultrasonic sensors to calculate the distance to an object around the front of the vehicle. The front parking aid sensors detect objects approximately 685.8 mm (27 in) from the front of the vehicle, 457.2 mm (18 in) from the front side of the vehicle, 304.8 mm (12 in) above the ground. To detect objects in front of the vehicle, the Parking Aid Module (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 of 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.
Parking Aid Audible Alert
The audio speaker volume is reduced when the parking aid warning tone sounds. The audio speaker increases its warning tone rate as the vehicle gets closer to an obstacle. When an object is detected within 304.8 mm (12 in) of the sensors, the warning tone becomes continuous. Objects to the rear side will generate continuous tone only for 3 seconds if the object is stationary or receding from the vehicle. The tone is prioritized to the system (front or rear) which has detected an object closest to the bumper. The tone alternates between the front and rear audio speakers if an object is closer than 254 mm (10 in) front and rear.