Refrigerant Circuit, General PrecautionsStarting the engine
First read and observe the introductory information
and safety warnings 
The steps should only be carried out in the specified order.
Step
Vehicles with a manual gearbox
Vehicles with an automatic gearbox
1.
...
Working on Airbag System
WARNING
When working on the airbag system (pyrotechnic
components, Airbag Control Module -J234-, wiring), the
ground cable must be disconnected with the ignition
switched on.
...
Severely Discharged Batteries
WARNING
Risk of injury. Follow all Warnings and Safety
Precautions. Refer to
→ Chapter „Warnings and Safety Precautions“.
For a battery to be indicated as †...