First read and observe the introductory information
and safety warnings
Seat belts may become damaged during any work on the belt tensioners or while removing or refitting any vehicle parts in conjunction with any other repair work. This damage will not always be noticeable. The consequence may be that the belt tensioners could function incorrectly, or not function at all, in the event of an accident.
Regulations must be observed to ensure that the effectiveness of the belt tensioner is not reduced and that removed parts do not cause any injuries or environmental pollution. Qualified workshops are familiar with these requirements.

WARNING
The airbag modules and belt tensioners may contain perchlorate. Please comply with legislation regarding disposal.
Automatic belt
retractor, belt tensioner, belt tension limiter
Airbag systemBattery, Testing using Midtronics Battery Tester -MCR340VKT
Requirements
WARNING
Read and follow the Safety Precautions when working
with batteries. Refer to
→ Chapter „Warnings and Safety Precautions“.
...
Indicator lamp
First read and observe the introductory information
and safety warnings
Lit up
Possible cause
Cruise control system (CCS) is controlling the speed.
Several warning and indicator lamps will light up briefly as a functional check
whe ...
Checklist
Using seat belts :
Check the condition of all seat belts regularly.
Keep the seat belts clean.
Avoid allowing any foreign bodies or fluids
to get on to the seat belt or latch plate or into the slot for the seat belt
buckle.
Do not trap or damage the seat belt and
latch ...