The electrical equipment diagram of the VAZ-2105 car is shown in Fig. 222, and the features of the VAZ-2104 diagram are given in Fig. 223. During the production of cars, changes were made to the diagrams aimed at increasing the reliability of individual units or associated with simplification of the diagrams. Since 1988, a contactless ignition system and a more powerful generator of the 37.3701 type began to be installed on some cars. Fig. 222 shows the electrical equipment diagram without the battery charge indicator relay, but with additional starter and ignition relays, i.e., the diagrams available on most cars produced.
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Fig. 222. Electrical equipment diagram of the VAZ-2105 car:
1 - side direction indicators; 2 - headlights; 3 - headlight cleaners; 4 - sound signals; 5 - the electric motor flew off the headlights; 6 - carburetor pneumatic valve control unit; 7 - Windshield wiper motor; 8 - Windshield washer motor; 9 - brake fluid level sensor; 10 - ignition coil; 11 - underhood lamp; 12 - ignition distributor; 13 - Oil pressure warning light sensor; 14 - spark plugs; 15 - coolant temperature gauge sensor; 16 - generator; 17 - carburetor microswitch; 18 - battery; 19 - carburetor pneumatic valve; 20 - starter relay; 21 - starter; 22 - Windscreen wiper relay; 23 - ignition relay; 24 - emergency signal and direction indicator relay; 25 - brake light switch; 26 - socket for portable lamp; 27 - Reverse light switch; 28 - Parking brake indicator lamp switch; 29 - mounting block; 30 - Instrument lighting switch; 31 - ignition switch; 32 - Outdoor lighting switch; 33 - Windscreen wiper switch; 34 - Windscreen washer switch; 35 - Sound signal switch; 36 - headlight switch; 37 - direction indicator switch; 38 - Hazard warning switch; 39 - Rear window heating switch; 40 - heater fan electric motor; 41 - cigarette lighter; 42 - Glove compartment lamp; 43 - ceiling light switches located in the door pillars; 44 - Rear fog light switch; 45 - Oil pressure indicator lamp; 46 - Fuel reserve indicator lamp; 47 - instrument cluster; 48 - Parking brake indicator lamp relay-interrupter; 49 - brake fluid level indicator lamp; 50 - control lamp block; 51 - Rear fog light indicator lamp; 52 - Parking brake indicator lamp; 53 - voltmeter; 54 - Side light indicator lamp; 55 - speedometer; 56 - direction indicator lamp; 57 - High beam indicator lamp; 58 - Heater motor switch; 59 - lampshade; 60 - additional resistor of the heater electric motor; 61 - rear lights; 62 - license plate lights; 63 - Fuel level indicator sensor; 64 - rear window heating element; A - the order of conventional numbering of plugs in the three-lever switch sockets.
1 - side direction indicators; 2 - headlights; 3 - headlight cleaners; 4 - sound signals; 5 - the electric motor flew off the headlights; 6 - carburetor pneumatic valve control unit; 7 - Windshield wiper motor; 8 - Windshield washer motor; 9 - brake fluid level sensor; 10 - ignition coil; 11 - underhood lamp; 12 - ignition distributor; 13 - Oil pressure warning light sensor; 14 - spark plugs; 15 - coolant temperature gauge sensor; 16 - generator; 17 - carburetor microswitch; 18 - battery; 19 - carburetor pneumatic valve; 20 - starter relay; 21 - starter; 22 - Windscreen wiper relay; 23 - ignition relay; 24 - emergency signal and direction indicator relay; 25 - brake light switch; 26 - socket for portable lamp; 27 - Reverse light switch; 28 - Parking brake indicator lamp switch; 29 - mounting block; 30 - Instrument lighting switch; 31 - ignition switch; 32 - Outdoor lighting switch; 33 - Windscreen wiper switch; 34 - Windscreen washer switch; 35 - Sound signal switch; 36 - headlight switch; 37 - direction indicator switch; 38 - Hazard warning switch; 39 - Rear window heating switch; 40 - heater fan electric motor; 41 - cigarette lighter; 42 - Glove compartment lamp; 43 - ceiling light switches located in the door pillars; 44 - Rear fog light switch; 45 - Oil pressure indicator lamp; 46 - Fuel reserve indicator lamp; 47 - instrument cluster; 48 - Parking brake indicator lamp relay-interrupter; 49 - brake fluid level indicator lamp; 50 - control lamp block; 51 - Rear fog light indicator lamp; 52 - Parking brake indicator lamp; 53 - voltmeter; 54 - Side light indicator lamp; 55 - speedometer; 56 - direction indicator lamp; 57 - High beam indicator lamp; 58 - Heater motor switch; 59 - lampshade; 60 - additional resistor of the heater electric motor; 61 - rear lights; 62 - license plate lights; 63 - Fuel level indicator sensor; 64 - rear window heating element; A - the order of conventional numbering of plugs in the three-lever switch sockets.
Electrical diagram of the VAZ-2104 car (see fig. 223) differs from the VAZ-2105 by the rear wiring harness and the installation of an additional lamp for illuminating the luggage area of the body. On some cars, a rear window cleaner with a rear window washer pump can be installed. In this case, a corresponding switch is added to the instrument panel.
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Fig. 223. Electrical diagram of the rear part of the VAZ-2104:
1 - mounting block: 2 - switches for ceiling lights located in the front door pillars; 3 - switches for the ceiling lights located in the rear door pillars; 4 - lampshades; 5 - Rear window wiper and washer switch; 6 - fuel level and reserve indicator sensor; 7 - rear body lighting lamp; 8 - rear window heating element; 9 - rear window washer motor; 10 - rear lights; 11 - License plate lights; 12 - rear window wiper motor.
1 - mounting block: 2 - switches for ceiling lights located in the front door pillars; 3 - switches for the ceiling lights located in the rear door pillars; 4 - lampshades; 5 - Rear window wiper and washer switch; 6 - fuel level and reserve indicator sensor; 7 - rear body lighting lamp; 8 - rear window heating element; 9 - rear window washer motor; 10 - rear lights; 11 - License plate lights; 12 - rear window wiper motor.
In all the diagrams provided in the "Electrical Equipment" section, the color of the wires is indicated by letters, with the first letter indicating the color of the wire, and the second (if there is one) — color of the stripe on the wire: B — white, G — blue, Zh — yellow, 3 — green, K — brown, P — red, O — orange, R — pink, S — gray, F — purple.
Voltage in the power supply circuit of the units is supplied mainly by the ignition switch. Always on (regardless of the position of the key in the ignition switch) power supply circuits for the sound signals, cigarette lighter, brake light, lampshades, portable lamp socket, power supply circuit for the hazard warning signal, clock and front door alarm lights.
Most of the vehicle's electrical power circuits are protected by fuses installed in the fuse box. The ignition and engine starting circuits, the battery charging circuit, and the windings of the low and high beam headlight relays are not protected by fuses.
Before replacing a blown fuse, find out the reason for its burning and eliminate it. Do not use fuses that are not provided for by the vehicle design. When searching for a malfunction, it is recommended to look at the circuits specified in Table 11 that this fuse protects. The fuse number is indicated on the cover of the mounting block.
Table 11
| fuse No | Protected elements (circuits) of electrical equipment |
| 1 | Rear lights (reversing light). Heater motor. Control lamp and relay (winding) for rear window heating. Rear window wiper and washer (on VAZ-2104) |
| 2 | Windscreen wiper and washer motors. Headlight wiper and washer motors. Windscreen wiper relay. Headlight wiper and washer relays (contacts) |
| 3 | Spare |
| 4 | Spare |
| 5 | Rear window heating element and heating relay (contacts) |
| 6 | Cigarette lighter. Socket for portable lamp. |
| 7 | Sound signals |
| 8 | Direction indicators in hazard warning mode. Switch and relay-interrupter of direction indicators and hazard warning lights in hazard warning mode |
| 9 | Generator excitation winding |
| 10 | Direction indicators in direction indicator mode and the corresponding indicator lamp. Control devices. Indicator lamps for fuel reserve, oil pressure, parking brake, brake fluid level. Relay-interrupter of the parking brake indicator lamp. Carburetor pneumatic valve control system |
| 11 | Rear lights (brake light bulbs). Ceiling lamp (for VAZ-2104 ceiling lights) interior body lighting |
| 12 | Right headlight (high beam). Winding of the headlight wiper relay (with high beams on) |
| 13 | Left headlight (high beam). High beam indicator lamp |
| 14 | Left headlight (side light). Right rear light (side light). License plate lights. Underhood light. Side light indicator light |
| 15 | Right headlight (side light). Left rear light (side light). Cigarette lighter lamp. Instrument lighting lamps. Glove compartment lighting lamp |
| 16 | Right headlight (low beam). Winding of the headlight wiper relay (with low beam on) |
| 17 | Left headlight (low beam). Rear lights (fog light) and the fog light indicator lamp |
All the wires on the cars are combined into four main wiring harnesses. The right and left mudguard wiring harnesses are located in the engine compartment, and the instrument panel and rear wiring harnesses are located in the passenger compartment. The engine compartment wiring harnesses are connected to the passenger compartment harnesses via a mounting block located in the right rear part of the engine compartment. The conditional numbers of the plugs in the junction blocks of the mounting block and the colors of the wires connected to them are shown in Fig. 224. The diagram of the internal connections of the mounting block is shown in Fig. 225.
The mounting block contains all the fuses and auxiliary relays. There are 17 fuses in total (15 for 8 A and two for 16 A - the 5th and 7th). On the cover of the mounting block opposite each fuse and relay there are symbols showing which circuits the fuse protects or which relay is switched on.
The cars may be equipped with mounting blocks of domestic production or manufactured in Yugoslavia (Serbia). Mounting blocks manufactured in Yugoslavia (Serbia) are non-disassemblable and cannot be repaired. In case of damage to internal connections, replace with new ones. Domestic mounting blocks can be disassembled and their printed circuit boards can be replaced. It is allowed to solder wires to replace burnt-out current-carrying tracks on printed circuit boards, but only if this does not require disconnecting the printed circuit boards.
To disassemble the mounting block, remove the cover and remove the relays, jumpers and fuses from the mounting block sockets. Then slide the case with the printed circuit boards out of the guide grooves of the mounting block frame. Unscrew the screws, remove the false panel and remove the printed circuit board block from the case.
When checking the serviceability of the vehicle's electrical circuit, it is not allowed to short-circuit the wires to the body, as this may lead to burnout of the current-carrying tracks of the mounting block.
It is better to check the circuit and units of electrical equipment using testers. For example, you can use the 43102 combination device. This device allows you to measure DC voltage in the ranges of 0-2, 0-20 and 0-40 V, AC voltage up to 400 V, DC resistance in the ranges of 0-0.01 and 0-100 kOhm, crankshaft speed up to 6000 min⁻¹, the angle of the closed state of the breaker contacts up to 90°.
When repairing a vehicle and its electrical system, it is essential to disconnect the wire from the "-" terminal of the battery.