Parking Aid Audible Alert
WARNING: This page is about a different car, the 2013 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
The 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.
When the PAM sounds the parking aid tone, it sends an audio volume cutback message to the IPC which sends a message to the ACM . When the ACM receives the message, it reduces the speaker output so the parking aid tone can be heard.