There is a high-pitched alarm in my WAV

A high-pithced tone in your vehicle indicates an alarm is sounding.

There are two things to check.

1: Is it the seatbelt warning sound.?
Check – Do all passengers have their seatbelts correctly fastened?
In modern cars a seatbelt warning may sound if a heavy item/bag is placed on a seat.

2: Is there a wheelchair docking station fitted to the vehicle?
If one is fitted – s this is the likely cause.
Docking stations make an alert-noise to indicate the wheelchair is not fully locked into place.
If no wheelchair is present the alarm still sounds but can be turned off by pressing the mute button. Highlighted in yellow on the image below.