00 00... Seat belts: checking condition of belt strap, function of inertia reel mechanism, locking reel, belt buckle

Belt strap, retractor mechanism, belt interlock 

Pull out strap and make sure it emerges without jerking.

Check belt strap for

• folding
• unraveling
• pinches
• cracks and tears
• traces of melting

Retract belt strap; here the inertia reel mechanism must retract the strap automatically and without squeaking noises, the last section of the strap may have to be fed in.

Pull out belt strap in short tugs - locking reel must lock.

Belt buckle 

The tongue on the belt strap must easily snap into place with an audible click.

When the "Press" button is pressed, the tongue must be ejected from the buckle under spring pressure.