Driver/passenger-side NECK-PRO head restraints - GF91.60-P-4053GZ

MODEL 164, 251

Fig 1: Identifying Driver And Front Passenger NECK-PRO Head Restraint Solenoid

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

The solenoids are integrated in the head restraints.

Function diagram for NECK-PRO head restraint

Fig 2: Identifying NECK-PRO Head Restraint In Basic Position And NECK-PRO Head Restraint In Position After Rear End Collision

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Tasks

The solenoid of the driver NECK-PRO head restraint and of the front passenger NECK-PRO head restraint activates a mechanism in the head restraint in the event of a rear end collision. The head restraint impact cushion then moves forward by approx. 40 mm and upward by approx. 30 mm thus reducing the distance between the head and the head restraint during the accident.

Function

The sensor electronics of the restraint systems control unit (N2/7) senses the vehicle acceleration and, if required, switches the solenoid in the head restraints on after a delay period of approx. 20 ms.

This releases a mechanic locking mechanism which activates the NECK-PRO function in the head restraints through spring force.

The cable of the restraint systems control unit that is used to activate the head restraint is routed through the head restraint bracket. Therefore, the head restraint can no longer be removed by the customer.

Triggered head restraints can be recognized by the fact that they are moved forward and cannot be adjusted. They can be reset with the available vehicle tool kit.