Audi A4 B7 is the third generation of the Audi A4. Produced in 2004, 2005, 2006 and 2007. This is an updated version of B6. Our material presents diagrams of relay and fuse boxes Audi a4 b7 with a description of the purpose of the elements. The fuse responsible for the cigarette lighter is marked.
Fuse descriptions may vary depending on the year of manufacture, equipment and type of vehicle engine. The current assignment should be in your operating manual and also on the back of the fuse box cover on the back of the dashboard.
Contents
Passenger compartment
Main fuse box
This box is located on the left side of the dashboard behind a plastic cover.
Diagram
Designation
| No. | Appointment |
| 1 | 10A air conditioner |
| 2 | 5A legroom lights |
| 3 | 5A overwhelmed windshield washer jets |
| 4 | 5A cooling fan |
| 5 | 10A telephone, engine oil level sensor, multifunction switches, heated rear seats, rear window shade, automatic transmission (gear shift) |
| 6 | 5A air conditioner (air quality assessment sensor), pressure sensor |
| 7 | 10A Electronic Stability Program (ESP), Brake Light Switch, Clutch Pedal Sensor, Steering Angle Sensor |
| 8 | 5A phone |
| 9 | 15A brake booster (vacuum pump) |
| 10 | 5A automatic headlight range control. Adaptive light right |
| 11 | absent |
| 12 | 10A diagnostic socket |
| 13 | 10A steering column module |
| 14 | 10A brake lights |
| 15 | 10A instrument cluster, navigation system |
| 16 | 5A garage door opener |
| 17 | 10A parking assist, ride height control, tire pressure monitoring, rain / light sensor |
| 18 | 5A Adaptive light (cornering light) left |
| 19 | 15A fog light |
| 20 | absent |
| 21 | absent |
| 22 | 15A driver / front passenger door |
| 23 | 15A rear doors |
| 24 | 20A comfortable electrical equipment with central control |
| 25 | 30A heater fan |
| 26 | 30A rear window heating |
| 27 | 30A trailer socket (control unit) |
| 28 | 20A fuel pump, diesel auxiliary pump |
| 29 | absent |
| 30 | 20A lift-slide roof panel |
| 31 | 15A automatic transmission, diagnostic socket, auto-shielded interior mirror |
| 32 | 20A trailer socket |
| 33 | 15A cigarette lighter |
| 34 | 15A missing |
| 35 | 20A socket in the trunk |
| 36 | 30A wiper |
| 37 | 30A windscreen washer pump and headlight cleaning device |
| 38 | 15A comfort electrical equipment with central control, trunk release |
| 39 | 20A radio system |
| 40 | 25A beep |
| 41 | 30A autonomous heater |
| 42 | 25A Electronic Stability Program (ESP) |
| 43 | 15A motor control |
| 44 | 35A seat heating |
Fuse number 33 at 15A is responsible for the cigarette lighter.
Under-dash fuse and relay boxes
Box 1 diagram
Appointment
| 1 | |
| 2 | |
| 3 | |
| 4 | Taxi-hands-free alarm system control unit 3 |
| A | |
| B | Optional equipment |
| c | |
| D | |
| H | (50A) Anti-lock braking system (ABS) |
| G | (40A / 60A) Cooling fan motor control unit 1 |
| F | (10A) Service vehicles |
| E | Cooling Fan Motor Control Unit 2 – If Equipped |
Box 2 diagram
Assignment
| 1 | Fuel pump relay – petrol |
| 2 | Power steering control unit (Servotronic) (if fitted) |
| 3 | Horn relay (dual tone) |
| 4 | Brake Booster Vacuum Pump Relay (If Equipped) |
| 5 | |
| 6 | Relay for auxiliary ignition circuits |
| 7 | |
| 8 | |
| 9 | |
| F1 | |
| F2 | (10A) Thermal fuse for the electric rear window shade |
| F3 | |
| F4 | (30A) Thermal fuse, rear power windows |
| F5 | (10A) Power seats (lumbar support adjustment) |
| F6 | (30A) Thermal fuse, front power windows |
| F7 | (30A) Trailer socket |
Box 3 diagram
Appointment
| 1 | – |
| 2 | Coolant Heater Relay 2 – High Power |
| 3 | Coolant Heater Relay 1 – Low Power |
| F1 | (30A) Additional heater – 2003 |
| F2 | (40A) Coolant heater |
| F3 | (60A) Coolant heater |
Engine compartment
Fuse box
Diagram
This box is located under the ECM / TCM (battery section). Several decryption options are possible.
Description for gasoline engines
| 1 | Coolant heater relay (V6) |
| 2 | Transmission control relay (Multitronic) |
| 3 | Exhaust air pump relay |
| 4 | Coolant pump motor control unit (AMM / BDV) |
| 5 | Start inhibit switch relay (if equipped) |
| F1 | (15A) Engine management system, brake light switch (brake pedal position sensor) |
| F2 | (40A) Exhaust air pump motor |
| F3 | (15A) Automatic transmission control system (6-speed automatic / Multitronic) |
Description for diesel engines
| 1 | Fuel boost pump relay |
| 2 | Transmission control relay (Multitronic) |
| 3 | Glow plug relay |
| 4 | Engine control relay |
| 5 | Start inhibit switch relay / reversing lamp relay (Multitronic) |
| F1 | (15A) Engine management system, brake light switch (brake pedal position sensor) |
| F2 | (60A / 80A) Glow plugs |
| F3 | (15A) Automatic transmission control system (6-speed automatic / Multitronic) |
| F4 | (60A) Glow plugs |
Main fuse on battery
Additional Information
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