Technician Safety Information

General Instructions/Safety Instructions

CAUTION:
Danger of damage due to improper handling of batteries and control module plug connections.
- Disconnect the battery connection terminals only when the engine is switched off.
- Start the engine only when the battery connection terminals are properly connected.
- Pull off or push on plug connections for the control units or other electronic components only when the ignition is switched off.
- Disconnect the negative terminal of the battery before welding work on the vehicle.

WARNING:
Danger of injury as a result of contact with liquid or gaseous refrigerants.
- Wear suitable protective gloves to protect your hands.
- Treat affected skin in the same way as in the case of freezing. Rinse immediately with cold water and then consult a physician.
- Wear safety goggles to protect your eyes.
- If refrigerant still gets in your eyes, consult a physician immediately.
- When working on the refrigerant circuit, always read the related introductions and warnings - Safety regulations for working on air-conditioned vehicles and dealing with refrigerant R 134a, Safety regulations for working with extraction and filling systems.

WARNING:
- Risk of injury.
- Do not smoke. Refrigerants could decompose in the burning ash. The resulting substances are toxic and should not be breathed in.
- The leaking refrigerant is not only colourless and odorless, but is also heavier than air and therefore displaces oxygen. If refrigerant gas escapes despite all safety measures having been taken, there is an undetectable risk of suffocation in poorly ventilated rooms and erection pits
- The gas/air mixture formed when refrigerant escapes should not be breathed in but rather extracted via suitable extraction systems (workshop extraction system).
- No welding, soldering or hard-soldering should be carried out on any part of the filled air-conditioning system. This also applies to welding and soldering work on the vehicle when there is a danger of parts of the air-conditioning system heating up. The warming causes very strong overpressure in the system, which can destroy components of the air-conditioning system.

NOTE:
- Communication with the air-conditioning system regulator control module can only be established once the ignition is switched on.
- The fault memory of the air-conditioning system regulator control module must be read out before troubleshooting.