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501-25-8 Body Repairs - General Information 501-25-8 DESCRIPTION AND OPERATION In addition, take into account: ‡ Remove fuel supply components as necessary. ‡ Protect working areas which are in danger of catching fire with a fireproof blanket. ‡ The welding must not cause components of the air conditioning system to become heated. ‡ Removal of any attached components in the space adjoining the repair area. ‡ Use covering paper to protect the interior from grinding dust. ‡ Create a definite barrier between the work area and the interior by using a carbon fibre blanket. Protective equipment The following protective equipment must always be used: ‡ Protective helmet or welding mask. ‡ Ear defenders and breathing protection. ‡ Protective gloves and safety boots. ‡ Welding fume extraction. Electronic components Increased use of comfort and safety electronics in modern motor vehicles also requires the greatest attention to be paid during body work. Overvoltages produced during welding and in alignment work during bodyshell rectification may cause electronic systems to be damaged. In particular, the safety instructions for performing welding work on vehicles with airbag systems must be adhered to. NOTE: After disconnecting the power supply and before performing further work, a wait time of up to 15 minutes must be maintained, depending on the vehicle. Work on airbag systems may only be performed by persons who have a relevant certificate of competence. Pay attention to the following points: ‡ Disconnect the battery negative clamp and cover the battery terminal. ‡ Disconnect the electrical connector at the airbag control module. ‡ If welding is to be performed directly near a control module, it must be removed beforehand. ‡ Never connect the negative cable of the welder near an airbag or a control module. ‡ Connect the negative cable of the welder close to the location of the weld. For additional information, refer to: Side Air Curtain Module (501-20 Supplemental Restraint System, Removal and Installation), Side Air Bag Module (501-20 Supplemental Restraint System, Removal and Installation), Driver Air Bag Module (501-20 Supplemental Restraint System, Removal and Installation), Driver Lower Air Bag Module (501-20 Supplemental Restraint System, Removal and Installation), Passenger Air Bag Module (501-20 Supplemental Restraint System, Removal and Installation), Liquefied gas vehicles Alternative fuel vehicles often require special handling in the workshop area. Above all, assembly operations to some extent require particular knowledge when dealing with the special technology and the safety regulations. NOTE: Only fully trained personnel are permitted to work on alternative fuel vehicles. These special requirements must be understood and taken into account in the body shop as well. CAUTION: Danger of fire and explosion. The safety instructions must always be followed when performing service work on fuel/gas systems. Failure to observe this instruction can lead to injury. If the smell of liquefied petroleum gas (LPG) or compressed natural gas (CNG) is noticed in the workshop, instruct everyone present as follows: ‡ No smoking and extinguish all naked flames. ‡ Shut off all electrical and air powered equipment. ‡ Evacuate the area. ‡ Ventilate the area. ‡ Contact the fire control authorities. ‡ Move the vehicle to a dedicated, well ventilated area. Alternative fuels require special handling: ‡ Handle them in a specially dedicated, well ventilated area, which is only accessible to authorized persons. ‡ Identify the designated area with new warning notices. ‡ If possible close the main shut-off valve and run the vehicle on alternative fuel until it switches automatically to petrol operation. Only then is it