Corner and back sensor locations
There are two corner sensors (A) at the corners of the rear bumper, and two back sensors (B) in the centre of the rear bumper.

See also:
How to make or receive hands-free calls
You can make or receive hands-free calls using a Bluetooth® compatible cellular
phone connected to the Bluetooth® 2.0 interface.
You can also use the phone books in the Bluetooth ® 2.0 interface ...
System preparation mode (approx. 20 seconds)
(The buzzer sounds intermittently and the security indicator (A) blinks.)
The system preparation time extends from the point at which all of the doors
and rear hatch are locked by pressing the LO ...
