Automatic Belt Retractor Locking Function, Checking

Automatic Belt Retractor Locking Function, Checking

The automatic belt retractor has 2 locking functions.

• The first locking function is initiated by the belt being jerked out of the belt retractor (belt extraction acceleration).

Test 1

- Pull the belt webbing out of the belt retractor with a firm jerk.

• No locking effect - replace seat belt complete with belt buckle.

• If difficulties are experienced when pulling out or retracting belt, first check whether position of the belt retractor has been altered.

• The second locking function is initiated by change in vehicle velocity (vehicle-dependent locking function).

Test 2

For safety reasons, road test should be carried out on traffic-free stretch to ensure that other motorists/pedestrians etc. are not endangered.

- Fasten seat belt.

- Accelerate vehicle to 12 mph (20 km/h) and then perform a full braking maneuver with foot brake.

• Replace seat belt complete with seat belt latch if seat belt is not locked by locking mechanism during braking procedure.