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Checking automatic belt device (locking effect)

The automatic belt device has two locking functions

The first locking function is triggered by pulling the seat belt out quickly (belt extension acceleration).

Test

Pull the seat belt out of the automatic belt device with a strong pull.

If no locking effect occurs, the entire seat belt and belt buckle must be replaced.
In the case of faults in the extension or retraction of the seat belt, check whether the locking tab of the automatic belt device is engaged correctly in the sheetmetal bracket on the body.
The second locking function is triggered by a change in the sequence of vehicle movement (vehicle-dependent locking function).

Test

CAUTION: For safety reasons, this driving test must be carried out on a traffic-free road, so that there is absolutely no danger to other road users.

Fasten the seat belt.
Accelerate the vehicle to 20 km/h (12 mph) and then perform an emergency stop with the foot brake.

If the belt is not locked by the blocking mechanism during the braking phase, the entire seat belt and belt buckle must be replaced.