On our 2023 Avenir from new we had only felt the seat vibrate when rear parking assist is on, which I thought was okay but would rather have the beep sound, so with checking the manual, I went to the settings app, tapped collision / detection, then rear assist, then found the option to have either the seat vibrate or have the beep sound, so now the car will beep in reverse if an object is behind the car. However, it's only one or the other as to choice of alert, they will not work with each other at the same time as to Beep AND Vibrate........... from the Buick.com website....
WHAT IS REAR PARK ASSIST?
Rear Park Assist uses multiple ultrasonic sensors located on your rear bumper. The feature works when you’re in REVERSE.
- When you’re backing up at low speeds, the sensors may detect objects up to 8 feet behind your vehicle.
- When an object is first detected while you’re backing up, Rear Park Assist emits low-pitched beeps from your rear speakers or, if your vehicle is equipped with the Safety Alert Seat, the driver seat pulses twice on both sides of the seat.
- The closer your vehicle is to a detected object, the more beeps you’ll hear or Safety Alert Seat pulses you’ll feel.
- As your vehicle gets closer to the detected object, your infotainment system or DIC will show distance-to-object information.
- When an object is within 2 feet of your rear bumper, you’ll hear five repeating low-pitched beeps from your rear speaker, or, if your vehicle is equipped with the Safety Alert Seat, it pulses five times on both sides.
- When an object is within 1 foot of your rear bumper, you’ll hear a continuous low-pitched tone play from the rear speakers or, if your vehicle is equipped with the Safety Alert Seat, the seat will pulse five times on both sides.
- As your vehicle gets closer to a detected object behind you, you will also see caution triangles that change from yellow to amber to red on the Rear Vision Camera display.