The car's ignition switch serves the purpose of connecting the starter to battery which allows the battery to send a powerful surge of electricity to the starter when the car is being started. It also allows you to control the power to many of the car's accessories.
The VW ignition switch allows you to distribute the electric current where it is needed. It generally has four positions: off, on start, and accessory. Some cars have two positions off and lock; where one turns off the car and the other allows the key to be removed from the ignition. The accessory position is where electricity is supplied to all but the ignition and starter circuit allowing you to play the radio, work the power windows and others even when the engine is not running. The on position turns on all of the car's systems including systems such as the fuel pump, and this is the position the ignition switch remains while the engine is running. When the key is inserted into the ignition switch lock cylinder and turned to the start position, the starter engages; when the key is released, it returns to the on position, cutting power to the starter.
The electrical wirings or the plastic housing may develop problems and one sure sign of this is when your car does not start. Another would be when the accessories like power windows slowing down and radio not playing. When you know that your battery is working fine but your vehicle shows no sign of life then ask your mechanic to go over your ignition switch. Make sure that you replace your VW ignition switch immediately when damaged.
