US national version

In US national version, 2 additional pins on the DSC control unit are assigned on vehicles without navigation system. 

The following signals are then transmitted to the telephone control unit:

• processed wheel speed, front right
• processed wheel speed, front left

DSC tells the control unit the wheel speeds, front left and right.

Advantage: 

Assume the vehicle is involved in a crash in a tunnel. The stored wheel speeds can be used to calculate the vehicle position (including cornering by left/right comparison).

The telephone control unit transmits the computed vehicle position in an emergency call.

Subject to alteration due to misprints, errors and technical modifications.