Some consider the VW Passat B4 to be a facelifted version of the third generation rather than a standalone fourth generation, as both share a core platform despite updated exterior body panels and a refreshed interior. This model series was produced from 1993 through 1996.
This guide details the fuse and relay designations for the Volkswagen Passat B4 (chassis code 3A2, 3A5, 35I; B3/B4 - PL34 platform), complete with circuit diagrams and panel location photos.
Passenger Compartment Fuse Panel
The fuse box is located under the dashboard on the driver’s side, behind a removable storage tray.
Remove the storage tray to access the fuses and relays.
Fuse panel layout overview.
| Diagram | |
|---|---|
|
|
| No. | Fuse Designation |
| 1 | 10 A – Low beam (left) |
| 2 | 10 A – Low beam (right) |
| 3 | 10 A – Instrument cluster illumination, license plate lights |
| 4 | 15 A – Rear window wiper, power sunroof, self-leveling suspension control unit |
| 5 | 15 A – Windscreen wipers and washer fluid pump |
| 6 | 20 A – Fresh air blower motor, air conditioning system |
| 7 | 10 A – Right sidelight / parking light |
| 8 | 10 A – Left sidelight / parking light |
| 9 | 20 A – Heated rear window, heated power mirrors |
| 10 | 15 A – Front fog lights, rear fog light |
| 11 | 10 A – High beam (left), high beam indicator |
| 12 | 10 A – High beam (right) |
| 13 | 10 A – Horn, radiator fan after-run control unit |
| 14 | 10 A – Reversing lights, power mirrors, heated washer nozzles, heated seats, engine temperature sensor, automatic transmission selector lever illumination |
| 15 | 10 A – Carburetor / Engine Control Unit (ECU) |
| 16 | 15 A – Instrument cluster, glove box illumination |
| 17 | 10 A – Turn signal indicators |
| 18 | 20 A – Electric fuel pump, oxygen sensor (lambda sensor) heater |
| 19 | 30 A – Radiator cooling fan, air conditioning system |
| 20 | 20 A – Brake lights, cruise control system |
| 21 | 15 A – Interior lighting, luggage compartment light, clock, central locking, cigarette lighter, instrument cluster memory |
| 22 | 10 A – Head unit / Audio system |
| No. | Relay Designation |
| 1 | Air conditioning system relay |
| 2 | Rear window wiper/washer intermittent relay |
| 3 | Overrun cut-off valve, idle stabilization valve, Digifant engine management system |
| 4 | Reserved |
| 5 | Coolant level warning control unit |
| 6 | Hazard warning light / Turn signal flasher unit |
| 7 | Headlight washer system relay |
| 8 | Windscreen wiper intermittent delay relay |
| 9 | Seat belt warning system control module |
| 10 | Front fog light relay |
| 11 | Dual-tone horn relay |
| 12 | Fuel pump relay, intake manifold preheater relay |
| 13 | Heated rear window timer relay |
| 14 | Reserved |
| 15 | ABS hydraulic pump relay |
| 16 | ABS main relay |
| 17 | Reserved |
| 18 | Reserved |
| 19 | Air conditioning relay |
| 20 | Reserved |
| 21 | ABS hydraulic pump and power window fuse |
| 22 | ABS valve system fuse |
| 23 | Reserved |
| 24 | Reserved |
Fuse No. 21 (15 A) protects the cigarette lighter circuit.
Fusible Links (Diesel Models)
On diesel models, the glow plug power supply circuit is protected by a fusible link. This strip fuse is located in the engine compartment above the brake booster or mounted on the glow plug control unit behind the windscreen washer fluid reservoir.
A blown fusible link indicates a fault within the electrical system. Before installing a replacement link, diagnose the glow plug preheating circuit to identify and resolve the root cause of the overload.