Location of components

Fig 1: Identifying Carphone Module Components

Courtesy of VOLVO CARS OF NORTH AMERICA.

Overview 

1. Telephone antenna mounted in front windshield
2. Telephone keypad in the steering wheel
3. Combined instrument panel display
4. Keypad beside audio system head unit
5. Handsfree microphone mounted in rear-view mirror
6. Handsfree loudspeaker mounted in drivers head rest
7. The handset in the front seat armrest.