Automatic Belt Retractor, Checking

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2018 Audi S8, 2018 Audi A8 Quattro, 2017 Audi S8, 2017 Audi A8 Quattro, and 2016 Audi S8. However, it is still accessible from the selected car via links, so may be relevant.

The automatic belt retractor has two 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

WARNING:

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 20 km/h (12 mph) 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.