Electrical equipment faults (VAZ-21099)

Contents: Types and arrangement of lamps ↓ Mounting blocks ↓ Circuits protected by fuses ↓ Specialized relays ↓ Electrical diagrams ↓

Most often, electrical equipment malfunctions occur during everyday use of a car. For objective reasons, electrical equipment repairs should be carried out qualified car service specialists.

Warning! Electrical equipment malfunction (short circuit) may cause electrical wiring to ignite and cause a fire.

If the fuse has blown, replace it. If the same fuse blows again, it will be a signal for immediate contact with a car service.

Attention! It is strictly forbidden to replace a blown fuse with another one with a higher "nominal value" or a "bug".

To make troubleshooting easier, purchase a wiring diagram for your vehicle.

If an electrical equipment malfunction occurs before you have time to buy an electrical circuit, you can fix minor faults yourself, which this section will help you with.

Types and arrangement of lamps

Mounting blocks

On VAZ-21099 family cars, two mounting blocks are used - the old 17.3722 and, since 1998, the new 2114-3722010-60. The main difference is the use of a new type of fuses: blade fuses instead of cylindrical fuses and new compact relays.

Mounting block type 17.3722:

1. Headlight wiper relay (K6). 2. Rear window washer timer relay (K1). 3. Direction indicator and hazard warning flasher relay (K2). 4. Windscreen wiper relay (K3). 5. Contact jumpers in place of the lamp health monitoring relay. 6. Rear window heating relay (K10). 7. Spare fuse. 8. High beam headlight relay (K5). 9. Low beam headlight relay (K11). 10. Fuse. 11. Engine cooling system fan motor relay (K9). 12. Horn relay (K8).

Mounting block type 2114–3722010–60:

K1. Switch-on relay for headlight cleaners. K2. Relay-interrupter for turn signals and emergency alarms. K3. Windscreen cleaner relay. K4. Lamp health monitoring relay. K5. Window lifter switch-on relay. K6. Audio signal switch-on relay. K7.Rear window heating switch. K8. Relay for switching on the high beam of headlights. K9. Relay for switching on the passing beam of headlights. F1–F16. Fuses. F17–F20. Spare fuses.

Circuits protected by fuses

fuse number in the fuse box		Protected circuits
17.3722	2114–3722010–60	Protected circuits
1 (8 A)	F9 (7.5 A)	Right fog light
2 (8 A)	F8 (7.5 A)	Left fog light
3 (8 A)	F1 (10 A)	Headlight cleaners (at the moment of switching on). Headlight washer relay (contacts). Headlight washer valve
4 (16 A)	F7 (30 A)	Headlight cleaners (in working mode). Headlight wiper relay (winding). Heater fan motor. Windscreen washer motor. Rear window wiper gear motor. Rear window washer timer relay. Windscreen and rear window washer valves. Engine cooling fan motor relay (winding). Rear window defroster relay (winding). Rear window defroster control lamp. Glove compartment light lamp
5 (8 A)	F16 (15 A)	Direction indicators and relay-interrupter of direction indicators and hazard warning lights (in turn indication mode). Indicator lamp for direction indicators. Rear lights (reversing light bulbs). Gearmotor and windshield wiper relay. Generator excitation winding (when starting the engine). Brake fluid level drop indicator light. Oil pressure drop indicator light. Carburetor air damper indicator light. Parking brake indicator light. "STOR" light indicator light. Coolant temperature gauge. Fuel gauge with reserve indicator light. Voltmeter
6 (8 A)	F3 (10 A)	Rear lights (brake light bulbs). Interior light
6 (8 A)	F6 (30 A)	Front door electric windows. Electric window switch relay
7 (8 A)	F10 (7.5 A)	License plate lights. Underhood light. Instrument lighting lights. External lighting indicator light. Heater lever illumination panel. Cigarette lighter light
8 (16 A)	F5 (20 A)	Electric motor of the engine cooling system fan and its switching relay (contacts). Sound signal and its switching relay
9 (8 A)	F10 (7.5 A)	Left headlight (side light). Left rear light (side light)
10 (8 A)	F11 (7.5 A)	Right headlight (side light). Right rear light (side light)
11 (8 A)	F2 (10 A)	Direction indicators and hazard warning flasher relay (in emergency mode). Hazard warning light indicator
12 (16 A)	F4 (20 A)	Rear window heating element. Rear window heating relay (contacts). Portable lamp socket. Cigarette lighter
13 (8 A)	F15 (7.5 A)	Right headlight (high beam)
14 (8 A)	F14 (7,5)	Left headlight (high beam). High beam indicator lamp
15 (8 A)	F13 (7.5 A)	Left headlight (low beam)
16 (8 A)	F12 (7.5 A)	Right headlight (low beam)

Specialized relays

Designation	Purpose	Marking
Designation	Purpose	Block 17.3722	Block 2114–3722010–60
K1	Rear Window Washer Timer Relay	452.3747	—
K2	Direction indicator and hazard warning relay	493.3747	495.3747
K3	Windshield wiper relay	522.3747	526.3747
K4	Lamp health control relay	—	4412.3747

Electrical diagrams

To carry out repair work in the previous sections, you can use the explanatory electrical diagrams provided below.

Contactless ignition system diagram:

1. Contactless sensor. 2. Ignition distributor. 3. Spark plugs. 4. Switch. 5. Ignition coil. 6. Mounting block. 7. Ignition relay. 8. Ignition switch.

Carburetor electromagnetic valve control system:

1. Carburetor limit switch. 2. Carburetor electromagnetic valve. 3. Mounting block. 4. Ignition switch. 5. Ignition relay. 6. Control unit. 7. Ignition coil. A. To terminal "30" of the generator. B. Numbering of plugs in the control unit.

Generator connection diagram:

1. Generator. 2. Negative valve. 3. Additional diode. 4. Positive valve. 5. Low battery indicator lamp. 6. Instrument cluster. 7. Voltmeter. 8. Mounting block. 9. Additional 100 ohm, 2 watt resistors. 10. Ignition relay. 11. Ignition switch. 12. Battery. 13. Capacitor. 14. Rotor winding. 15. Voltage regulator.

Wiring diagram for the electric motor of the engine cooling system fan on vehicles with a mounting block of type 17.3722:

1. Fan electric motor. 2. Electric motor switch. 3. Mounting block. 4. Ignition switch. K9. Fan electric motor switch relay. A. To terminal "30" of the generator.