2. To access the fuse box behind the left end cover of the instrument panel, pry this cover up and remove it. The purpose of the fuses is also indicated on the back of the cover. There are also several spare fuses and pliers for removing them.
Fuses
3. Each individual fuse is used to protect a specific electrical circuit or several circuits at once. Fuses of compact design, equipped with bayonet contacts, and, if necessary, easily removed from their sockets with fingers or pliers are mostly used in mounting blocks (see paragraph 2). If any of the power consumers fails, the first thing to check is always the condition of the corresponding fuse. Turn on the ignition and use a test lamp to probe the open terminals of each fuse. If the lamp lights up when connected to each terminal, the fuse is OK. If voltage is present only on the power supply side, the fuse is blown. Note also that the fuse body is usually made of transparent plastic, through which it is easy to determine the condition of the working jumper.
4. When replacing a blown fuse, make sure that the replacement element you prepare matches the type of the one that failed. Fuses designed for different nominal current strengths may not physically differ from each other in any way, but they are not interchangeable. Each electrical circuit has different operating parameters and requires a different degree of protection, so replacing a fuse designed for a certain current strength with a fuse with parameters that do not match is fraught with the most serious consequences (until a fire breaks out). The operating parameters of the fuse are usually indicated on its plastic housing, and color identification is also used.
5. If the new fuse also fails immediately after installation, there is no point in replacing it further - first you should identify and eliminate the cause of the overload in the circuit. In most cases, this is a short circuit in the connecting wiring caused by damage to its insulation. Spare fuses are usually placed in free terminal blocks of the mounting block.
Relay
6. To supply power or control signal to some of the electrical consumers in the vehicle(such as fuel injection system components, horn, starter, cooling fan, fog lights and others) relays are used. In fact, a relay is an electric key that ensures the closure of the working circuit by a control signal. If the relay fails, the corresponding consumer will fail to function. A description of how to check the proper functioning of the relay is given below. Failed relays must be replaced.
7. If it is not possible to find out how to connect the relay to the corresponding electrical circuit using the electrical connection diagrams (diagrams are provided at the end of the Manual), it should be remembered that the approach to testing any relay is, in principle, the same in all cases (see below).
8. In most cases, the control circuit is always connected to two of the relay contact terminals. When control voltage is applied to these terminals, the current begins to circulate through the relay control winding, resulting in the closing of the contacts of the working circuit of the consumer of electrical energy. The remaining terminals are the terminals of the working circuit.
9. In order to facilitate the identification of the relay terminals, explanatory markings with an image of the key connection diagram are usually applied to its body.
10. Before removing the relay, make sure that the corresponding circuit is de-energized.
11 Connect a fused jumper wire between one of the relay control terminals and the positive battery terminal. Use a second jumper wire to ground the other control terminal - the relay should click. Some relays require polarity - if there is no click, try reversing the polarity of the control terminals.
12. With the jumper wires connected, check for conductivity between the terminals of the working circuit.
13. If the test result is negative, replace the relay.
[The full version is posted on the resource: audimanual.ru]