Volkswagen Transporter T4 – represents the 4th generation of the legendary series “transporter”. This model was produced in 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002 and 2003 with diesel and a hundred roof. Also on the T4, Volkswagen continued the line of luxury models Caravelle, California and Multivan. In our material we will show the location of all electronic control sides and a detailed description of the purpose of fuses and relays Volkswagen T4 with diagrams of the blocks in which they are located and their photos. We will note the fuse responsible for the cigarette lighter.
The actual purpose of the fuses may differ from the one presented and depends on the year of manufacture and the level of electrical equipment
of the T4 .
Block arrangement
General scheme
Description
| 1 | Air conditioning control unit 1 – with automatic temperature control – in the heater control panel, front |
| 2 | Air conditioning control unit 2 – with automatic temperature control – in the heater control panel, rear – center pillar |
| 3 | Evaporator fan control unit (air conditioning) – with rear air conditioning – behind the right rear trim panel |
| 4 | Air conditioner/heater fan motor control unit 1 – with automatic temperature control – front – fan unit |
| 5 | Air conditioner/heater fan motor control unit 2- with automatic temperature control – rear-bottom of body, in the center |
| 6 | Antenna signal amplifier – behind the dashboard, on the passenger side |
| 7 | Generator resistor – near additional relays – CV / AUF, with 150A generator / automatic transmission / automatic temperature control – behind the central part of the instrument panel |
| 8 | Additional battery – under the driver’s seat |
| 9 | Rechargeable battery |
| 10 | Central locking signal control unit – behind the instrument panel |
| 11 | Cruise control unit (with throttle actuator motor) – the cruise control functions are performed by the electronic engine control unit |
| 12 | Electronic cruise control unit (without throttle actuator motor) – behind the instrument panel, on the passenger side |
| 13 | Diagnostic Link Connector (DLC) – instrument panel, driver’s side |
| 14 | Diagnostic unit – 05/99 (except AAC/ABL/AET/AES/AJA) – in the instrument cluster |
| 15 | Cooling system fan motor relay – behind the left headlight |
| 16 | Cooling system fan motor resistor 1/2 – behind the left headlight |
| 17 | Coolant heater control unit (with additional coolant heater – D3W/B4W/D4W) – in the heating section – underbody, in the center |
| 18 | Coolant heater control unit (with additional coolant heater – B7W/D7W) – behind the dashboard on the passenger side |
| 19 | Engine oil pressure warning buzzer – in the instrument cluster control unit |
| 21 | Fuse/relay block, instrument panel 1 |
| 22 | Fuse/Relay Block 2, Instrument Panel – Under Fuse/Relay Block 1 of the Instrument Panel |
| 23 | Fuse/Relay Block, Instrument Panel 3 – Above Instrument Panel Fuse/Relay Block 1 |
| 24 | Fuse/relay block, instrument panel 4 – behind the instrument panel, in the center |
| 25 | Fuse/Relay Block, Driver Seat – Under Seat |
| 26 | Fuse/relay block, engine compartment – on battery |
| 27 | Additional fuse (5A/7.5A/10A) – at the back of the audio system unit |
| 28 | Additional fuse (10A) – at the rear of the navigation system control unit |
| 29 | Headlight warning buzzer – in the instrument cluster control unit |
| 30 | Heater fan motor resistor – manual temperature control – fan assembly, front |
| 31 | Horn 1/2 – behind the front bumper |
| 32 | Immobilizer control unit – by instrument cluster |
| 33 | Immobilizer ring antenna near the ignition switch |
| 34 | Turn signal relay, hazard warning relay – in the hazard warning switch |
| 35 | Instrument cluster control unit/digital multifunction display – in the instrument cluster |
| 36 | Outside air temperature sensor – behind the front bumper |
| 37 | Driver’s seat heating control unit – in the seat heating switch |
| 38 | Passenger seat heating control unit – in the seat heating switch |
| 39 | SRS system control unit – under the dashboard, in the center |
| 40 | Electric sunroof control unit |
| 41 | Thematic control unit – in the navigation system display |
| 42 | Telephone interface control unit – by instrument cluster |
| 43 | Electronic gearbox control unit – near the engine control unit |
| 44 | Vehicle speed sensor – gearbox |
Cabin block
The main unit with fuses and relays is located under the instrument panel, on the driver’s side, behind the glove compartment.
Main unit
Photo example
Relay purpose
- (105) Heater fan motor relay – rear (ventilation)
- (174) Rear window wiper/washer relay
- (30/109) Engine control system relay
- (18) Relay 1 of auxiliary ignition circuits
- Reserve
- (22/21) Emergency ventilation relay (with turn signal repeaters on the roof)
- (95) Headlight washer pump relay
- (99) Windshield wiper/washer intermittent relay
- (36) Headlight warning buzzer
- (53) Fog light relay
- (53) Horn relay
- (167) Fuel pump relay
Decoding fuses
| 1 | 10A Left headlight – low beam, headlight range control |
| 2 | 10A Right headlight – low beam, headlight range control |
| 3 | 10A License plate lights |
| 4 | 15A Rear window wiper/washer, 2 auxiliary ignition circuit relay, additional equipment |
| 5 | 15A/20A Windshield wiper/washer, windshield washer nozzle heaters (05/01) |
| 6 | 30A Air conditioning system, heater fan motor |
| 7 | 10A Front right side marker / rear right side marker lamps |
| 8 | 10A Front left side marker / rear left side marker lamps |
| 9 | 20A Heated rear window, heated exterior mirror |
| 10 | 15A Fog lights, fog lamps |
| 11 | 10A left headlight-high beam |
| 12 | 10A Right headlight-high beam |
| 13 | 10A Audible signal |
| 14 | 10A ABS system (with ESP), automatic transmission control system, additional equipment, central locking, cruise control system, electric windows, electric door mirrors, reversing light |
| 15 | 10A Engine management system, crankcase ventilation heater, cruise control system, vehicle speed sensor |
| 16 | 15A ABS indicator, glove box light, turn signals, immobilizer, instrument cluster |
| 17 | 10A Additional heater |
| 18 | 20A Engine management system, fuel pump |
| 19 | 10A Cooling system fan motor control unit, coolant pump motor |
| 20 | 10A Stop signals |
| 21 | 15A Audio system, diagnostic connector (DLC), interior lights, navigation system |
| 22 | 10A Cigarette lighter fuse, radio |
Fuse number 22 at 10A is responsible for the cigarette lighter.
Additional fuse block
It is located under the main unit.
Marking
| 1 | 15A Accessory power connector |
| 2 | 15A Trailer electrical connector |
| 3 | 10A Roof identification light |
| 4 | 20A Auxiliary heater (AC V/AH Y/AJT/AU F) |
| 5 | 10A Anti-lock braking system (ABS) |
| 6 | FOR Phone |
| 7 | 15A Taxi |
| 8 | 10A Roof fan |
| 9 | 15A Audio system, instrument cluster |
| 10 | 15A Central lock |
| 11 | 15A Seat heater |
| 12 | 30A Heated door mirrors, heated rear window |
| 13 | FOR Phone (ACV/AH Y/AJT/AU F) |
| 14 | 30A Air conditioning system – manual automatic temperature control |
| 15 | 20A Additional heater |
Additional relay unit 1
Located in the correct part of the main unit.
Scheme
Description
| 1 | (53) Coolant pump relay |
| 2 | (125) Idle speed control relay (AM) |
| 3 | (137) Glow plug control unit (ABL) |
| 4 | (53) Relay 2 auxiliary ignition circuits (some models) |
| 5 | (53) Relay 2 auxiliary ignition circuits (AES, with air conditioning) |
| F1 | (30) Window circuit fuse |
| F2 | (15) Engine control unit |
| F3 | (15) Actuator |
Additional relay unit 2
It is located behind the dashboard in the center.
Scheme
Marking
| 1 | (106) Auxiliary heater relay |
| 2 | Relay that switches the audio system/telephone speaker |
| 3 | (53) Heater fan motor relay – rear (warm air) |
| 4 | (114) Heater fan motor relay – automatic temperature control |
| 5 | (152) Heater radiator coolant valve relay (rear heater) |
| 6 | (38) Air intake switching actuator relay (air conditioner/heater) |
| 7 | (53) Generator relay (AES, with 150A generator) |
| 8 | (53) Alternator relay (ACV/AUF, with 150A alternator/automatic transmission/automatic temperature control) |
| 9 | (175) Immobilizer switch relay/reverse light relay |
| 10 | (87) Wheel hub connection control unit |
There may be another block under the driver’s seat. There may be the following elements: (214/426) Auxiliary battery relay, (403) Auxiliary heater relay, (30A) Auxiliary liquid heating system, (5A) Sockets , etc.
Block under the hood
This unit is located on the cover in front of the battery.
Scheme
Transcript
| 1 | 60A Glow plug relay |
| 2 | 50A Cooling system fan motor |
| 3 | 50A Cooling system fan motor |
| 4 | 50A Anti-lock braking system (ABS) |
| 5 | generator 110A/150A/175A |
| 6 | 30A Stability control system |
| 7 | 30A Anti-lock braking system (with ESP) |
| 8 | 5A Exchange rate stability support system |
Volkswagen T4 fuses and relays. Volkswagen T4 fuse diagram.