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Overview
Cars Passat have the electrical system with an operating voltage of 12 V. The electrical equipment on a single scheme - the negative conclusions of sources and electricity consumers are connected to the car body, which acts as the second wire. Power of lighting products and electrical equipment is provided by the battery lead-acid type, rechargeable from the alternator. This section describes procedures for maintenance and repair of some of the elements of an onboard electric equipment. In addition, we will look troubleshooting electrical general. On the Passat installed device Controller Area Network (CAN). It combines individual control devices in the general scheme (data bus), which provides the following benefits: fast transmission of data from one device to another, saving space through the use of smaller motherboards and components, reducing the number of sensors due to their versatility.
The principle of CAN Instead of a separate wire for each signal uses only two common wires that can simultaneously receive information on most devices and sensors, without using a separate toggle switches and switches. Bus CAN, getting important information (eg fault), fix it in your memory.
Accident prevention At repair of electrical equipment and power supply system of the engine disconnect the wire from the plug ?�-?� the storage battery. When replacing fuses it is prohibited to use a screwdriver and a metal tool, as this could cause a short circuit in the electrical circuits. Do not disconnect the ignition switch and the battery with the engine running, as this will result in damage to the voltage regulator and the elements of the electronic devices in your car. When testing electrical circuits Never short on "weight" wire (check serviceability chains "to spark"), as this may cause damage to the electrical components. It is forbidden to even briefly connect the output "30" of the generator with "weight" (check the operation of the generator "to spark"), as it will lead to failure of the diode rectifier unit generator. Check the generator on the car can only voltmeters and ammeters. To avoid failure of the diode rectifier unit is prohibited or check their Megger test lamp supply voltage greater than 12 V, as well as to check such a chain of electrical appliances in a vehicle without disconnecting the wires from the generator. Check the insulation resistance of the stator winding of the generator voltage must be increased on the alternator removed from the car, when disconnected from the rectifier output unit of the stator winding. When carrying out electric welding on the vehicle is necessary to disconnect the wires from the battery terminals and the generator. Do not touch the ignition system components and high-voltage wires on the working engine. Do not run wires low and high voltage in one bundle. When recharging the battery on the vehicle with the charger disconnect the wires from the battery terminals.
Checking voltage supply Check for voltage produced in the event of malfunction of the circuit. Connect one of the wires in the electrical circuits of the tester or to the negative pole of the battery or to a well-grounded point of the car body. Another wire tester is connected to the terminal of an electric socket circuit under test, preferably next to the battery or fuse. If the warning light tester lights, the power supply in this segment of the chain is present, confirming serviceability of the connection between this point of the circuit and the battery. Continuing to do the same, explore the rest of the chain. Detection of lack of power supply indicates the presence of a fault between a given point of the circuit and the last of the previously tested (where the supply voltage present). In most cases, the cause of failure is a weakening of the electrical connectors and a violation of the quality of the contacts (oxidation).
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