The review covers Volkswagen Passat b3 b4 cars produced in 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995 and 1996 with station wagon and sedan bodies with both petrol and diesel engines.
Where is the relay and fuse box for the Passat B3 B4
The main fuse and relay box is located in the passenger compartment on the driver’s side at the bottom of the instrument panel under the shelf. To access the mounting block, you need to remove the shelf.
On the back of the tray there is a decoding of the relays and fuses.
Volkswagen Passat B3 B4 Fuse and Relay Diagram
Designation of fuses
| Fuse number | Fuse color | Protected circuit |
| F1 (10 A) | Red | Low beam (left headlight) |
| F2 (10 A) | Red | Low beam (right headlight) |
| F3 (10 A) | Red | Instrument cluster and number plate lighting |
| F4 (15 A) | Blue | Tailgate glass wiper, sunroof, self-leveling rear suspension control unit |
| F5 (15 A) | Blue | Windscreen wiper, windscreen and rear window washer |
| F6 (20 A) | Yellow | Heater fan, air conditioner |
| F7 (10A) | Red | Side light (right) |
| FB (10 A) | Red | Side light (left) |
| F9 (20 A) | Yellow | Heated rear window and rear view mirrors |
| F10 (15 A) | Blue | Fog lights and rear fog light |
| F11 (10 A) | Red | High beam (left headlight), high beam indicator lamp |
| F12 (10 A) | Red | High beam (right headlight) |
| F13 (10 A) | Red | Horn, radiator fan (after engine off) |
| F14 (10 A) | Red | Reversing lights, electric outside mirrors, heated washer nozzles, heated seats, engine temperature gauge, automatic transmission selector dial illumination |
| F15 (10 A) | Red | Carburetor or electronic engine management system |
| F16 (15 A) | Blue | Instrument cluster, glove compartment lighting |
| F17 (10 A) | Red | Direction indicators |
| F18 (20 A) | Yellow | Electric fuel pump, oxygen concentration sensor (lambda probe) |
| F19 (30 A) | Green | Cooling system fan, air conditioner |
| F20 (20 A) | Yellow | Brake lights, speed control system |
| F21 (15 A) | Blue | Interior lights, luggage compartment lights, clock, central locking, cigarette lighter and instrument cluster |
| F22 (10 A) | Red | Car radio |
Relay designation
| Relay number | Purpose of the relay |
| 1 | Air conditioning system |
| 2 | Rear wiper with intermittent function |
| 3 | Idle Speed Control Switch, Idle Speed Increase Valve, Engine Management System (Digifant) |
| 4 | Reserve |
| 5 | Coolant level indicator |
| 6 | Emergency alarm system |
| 7 | Headlight cleaning system |
| 8 | Intermittent windscreen wiper and washer system |
| 9 | Seat belt warning system |
| 10 | Fog lights |
| 11 | Sound signal |
| 12 | Fuel pump, intake manifold heater (where provided) |
| 13 | Rear window heating timer |
| 14 | Reserve |
| 15 | ABS hydraulic pump |
| 16 | ABS |
| 17 | Reserve |
| 18 | Reserve |
| 19 | Air conditioning system |
| 20 | Reserve |
| 21 | ABS hydraulic pump and electric window drive fuse |
| 22 | ABS valve system fuse |
| 23 | Reserve |
| 24 | Reserve |
Volkswagen Passat B3 B4 fuses and relays. Volkswagen Passat B3 B4 fuse diagram.