Audi A8 (D3 / 4E, 2002 - 2010) fuses and relays

The A8 is a luxury car manufactured by Audi AG in Neckarsulm, Germany, the successor to the V8. In this material, we will analyze in detail the fuse circuits of the Audi A8 (D3 / 4E) of the 2nd generation of  2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009  of release.

General view of the car
Here you will find the locations and photos of the mounting blocks. Separately, we note the fuse responsible for the fuel pump and cigarette lighter.

In the engine compartment

Location of the fuse box in the engine compartment
It is located in the center of the engine compartment behind the lining.

Diagram
No. Description A
1 not used
2 secondary air pump 50/60/80
Or
glow plug
3 secondary air pump 50/60/80
Or
glow plug
4 not used
5
6
7
R1 Glow plug relay
Secondary air pump relay
R2
  • Glow plug relay
  • Main relay
  • Secondary air pump relay
R3
  • Glow plug relay
  • Secondary air pump relay
  • Main relay
R4 not used

In the cabin

There are two fuse mounting blocks and two relay boards here.

Location of the first fuse box in the passenger compartment on the driver's side
The first fuse box No. 1 is located on the driver's side at the end of the dashboard behind a plastic cover.


General form.

Diagram of the fuse box No. 1 on the driver's side
No. A Purpose
1 5 garage door opener (HomeLink)
2 5 parking assistance (acoustic parking system)
3 5
4 10 automatic headlight beam throw adjustment
5 5 instrument cluster
6 10 steering column electronics control unit
7 5 diagnostic plug
8 5
9 5 electronic stability program (ESP)
10 5 instrument cluster
11 - is absent
12 5 brake light switch
13 10 telephone
14 - is absent
15 5 driver identification system control unit
16 - is absent
17 5 distance maintenance (adaptive cruise control)
18 5 heated windshield washer jets
19 - is absent
20 5 tire pressure monitoring system
21 - is absent
22 5 brake light switch
23 5 telepassport
24 15 sound signal
25 40 wiper
26 - is absent
27 25 electronic stability program (ESP)
28 - is absent
29 10 lighting switches
30 - is absent
31 30 onboard power supply control unit, front right lighting
32 - is absent
33 25 additional space heater for hoi rear left
34 - is absent
35 - is absent
36 - is absent
37 - is absent
38 30 onboard power supply control unit, lighting front left
39 7.5 front left door control unit
40 25 steering column adjustment
41 7.5 rear left door control unit
42 25 start identification/permission control unit
43 - is absent
44 - is absent

Location of the second fuse box in the passenger compartment (passenger side)
Fuse box #2 is located on the passenger side behind a plastic cover.

Assigment of fuses in the passenger side
No. A Description
1 5 electromechanical parking brake
2 10 air conditioning
3 5 shift gate, PN-lock
4 15 automatic transmission (multitronic)
5 15 engine management
6 15 lambda probes
7 15/10 lambda probes/high pressure valve
8 10 engine management, auxiliary water pump
9 5 air conditioning, instrument panel keys
10 10 air suspension (adaptive air suspension)
11 5 light and rain sensor
12 5 display/control unit front
13 10 electronics in the ceiling
14 5 media player in front (CD player, DVD player, etc.)
15 5 battery-energy management system
16 5 heating crankcase ventilation system
17 5 jura valve electronics
18 - is absent
19 5 diesel air mass sensor
20 5 air-conditioned seat
21 5/15 engine management (gasoline/diesel)
22 10 fuel cooling
23 5 electromechanical parking brake
24 10 onboard power supply control unit 2
25 15 automatic transmission
26 10 water pump/A/C valves, rear A/C controls
27 20 sliding roof panel
28 5 the engine control unit
29 15 Valve injectors
30 30 ignition coils
31 20/40 fuel pump right/fuel pump electronics (petrol)
32 5/10) automatic transmission/multitronic
33 25 additional heating gel legroom rear right
34 20 heated/ventilated rear seats
35 20 Heated/ventilated front seats
36 20 Front cigarette lighter audi a8 d4
37 20/30 rear cigarette lighter and sockets
38 20 additional radiator fan
39 7.5 front right door control unit
40 15 brake booster
41 7.5 rear right door control unit
42 20 auxiliary heater/auxiliary heater
43 30 headlight cleaner
44 30 heater fan


Relay board #1 is located behind the trim at the passenger's feet.

Cabin relay blocks
Relay Diagram #1 Passenger Side
No. Purpose A
R1
  • Cooling Fan Relay
  • Cooling Fuel Pump Relay
  • Brake servomotor
  • additional coolant pump
  • Coolant circulation relay
R2 Starter relay
R3
R4 Fuel pump relay
Or
Power relay
R5 Headlight washer relay
1 Front right window lifter 30
Or
empty
2 Seat adjustment 30
3 blower 30
Or
Front right window lifter
Or
empty
4 Seat adjustment 30
5 not used
6


Relay board #2 is located behind the trim on the driver's side.

Relay diagram #2 on the driver's side of the Audi A8 (D3)
No. Purpose A
1 ABS control unit 60
2 Leveling system 40
3 Power window 30/40
4 Seat adjustment 30
5 30
6 not used
7 not used
8 not used
R1 Adaptive Suspension Compressor Relay
R2 signal relay
R3 Terminal 15 supply voltage relay
R4 Washer heating relay
R5 Security system control unit (taxi)
R6 Terminal 75 supply voltage relay
R7 empty
R8 empty
R9 empty
R10 empty

In the luggage compartment

There are two blocks here.
Location of the first fuse box in the luggage compartment
Block number 1 is on the right side behind the skin.


Access example.


General form.

Assigment of fuses in block No. 1 (right)
No. A Description
1 20 fuel pump right (diesel)
2 20 fuel pump on the left (gasoline / diesel)
3 15 trailer socket
4 - is absent
5 20 intelligent power module at the rear (light on the left)
6 10 intelligent power module at the rear (light on the right)
7 20 intelligent rear power module (trunk closing assist)
8 30 electromechanical parking brake, left motor
9 30 electromechanical parking brake, right motor
10 15 trailer control unit (light left)
11 15 trailer control unit (light on the right)
12 10 trailer control unit
A 40 Rear window heating
B 30/40 Rear seat adjustment
Or
Gasoline pump
C 30 Rear seat adjustment
D 15 Communication system
Or
Not used
R1 Heated rear window relay
R2 Power relay
R3 Fuel pump relay
1 150 Source of power
2 60 Radio
Navigation system
TV tuner
3 110 Rear window heating


The second block located on the left side.

Block #2 (left)

General form.

Diagram.
No. A Purpose
1 - No
2 - No
3 - No
4 - No
5 30 DSP amplifier
6 5 navigation
7 10 TV tuner
8 - is absent
9 communication block
10 15 phone loudspeaker in hat rack
11 20 socket
12 5 auxiliary heater radio receiver
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