Audi A8 D3 (4E) – fuse and relay

At the end of 2002, the first Audi A8 was replaced by an updated model –  D3 / 4E . Produced in 2003, 2004, 2005, 2006, 2007, 2008, 2009 and 2010. During all this time, she received 2 restyling: the front grill and taillights have changed noticeably. In our article you will find a description of relay and fuse boxes for the Audi A8 D3 with box diagrams and the purpose of their elements.

 Audi A8 photo

Locations

General block diagram

  1. Fuse box on the left dashboard;
  2. Relay and fuse box in the engine compartment;
  3. Relay and fuse box behind the dashboard;
  4. Fuse box on the dashboard on the right;
  5. Fuses on the rack on the right;
  6. Fuse box at the passenger’s feet;
  7. 8. 9. 10. – Blocks with relays and fuses in the luggage compartment on the left and right, respectively.

Fuse box on the left in the passenger compartment

Located on the left side of the dashboard behind a plastic cover.

fuses in the passenger compartment of the Audi A3 8l

Diagram

fuse box diagram

Designation

No.ConsumerA
1garage door opener (HomeLink)5
2parking assistance (acoustic parking system)5
3parking assistance (acoustic parking system)5
4automatic headlight range control10
5instrument cluster5
6steering column electronics control unit10
7diagnostic plug5
8diagnostic plug5
9Electronic Stability Program (ESP)5
10instrument cluster5
11absent
12brake light switch5
13telephone10
14absent
15driver identification system control unit5
16absent
17maintaining distance (adaptive cruise control)5
18heated washer jets5
19absent
20tire pressure monitoring system5
21absent
22brake signal switch5
23TV passport5
24sound signal15
25wiper40
26absent
27Electronic Stability Program (ESP)25
28absent
29lighting switches
30absent
31Onboard power supply control unit, front right lighting30
32absent
33additional space heater for hoi rear left25
34absent
35absent
36absent
37absent
38Onboard power supply control unit, front left lighting30
39front left door control unit7.5
40steering column adjustment25
41rear left door control unit7.5
42identification / start enable control unit25
43absent
44absent

Fuse box on the right in the passenger compartment

real photo of the fuse box

Assignment

No.AppointmentAmpere
1electromechanical parking brake5
2air conditioning10
3shifter, PN-blocking5
4automatic transmission (multitronic)15
5engine control15
6lambda probes15
7lambda probes / high pressure valve15/10
8engine management, additional water pump10
9air conditioning, instrument panel keys5
10air suspension (adaptive air suspension)10
11light and rain sensor5
12display / control unit in front5
13electronics in the ceiling10
14media player in front (CD player, DVD player, etc.)5
15battery-energy management system5
16heating crankcase ventilation system5
17valve electronics jura5
18absent
19diesel air mass meter sensor5
20air-conditioned seat5
21engine management (petrol / diesel)5/15
22fuel cooling10
23electromechanical parking brake5
24onboard supply control unit 210
25automatic transmission15
26A / C water pump / valves, rear A / C controls10
27lift-slide roof panel20
28the engine control unit5
29Valve nozzles15
30ignition coils30
31fuel pump right / fuel pump electronics (petrol)20/40
32automatic transmission / multitronic5/10
33additional heating gel legroom rear right25
34heated / ventilated rear seats20
35Heated / ventilated front seats20
36Front cigarette lighter20
37rear cigarette lighter socket20/30
38additional radiator fan20
39front right door control unit7.5
40brake booster15
41rear right door control unit7.5
42auxiliary heater / additional heater20
43headlight cleaner30
44heater fan

For the front cigarette lighter, there is a fuse number 36A at 20A.

Fuses located in the luggage compartment

on the left side

diagram on the left

Protected components

No.A
1
2
3
4
5DSP amplifier30
6navigation5
7TV tuner10
8absent
9communication unit5
10phone loudspeaker in hat shelf15
11socket20
12radio receiver for auxiliary heater5

on the right side

scheme on the right

Designation

No.A
1fuel pump on the right (diesel)20
2fuel pump on the left (petrol / diesel)20
3trailer socket15
4absent
5intelligent power module at the back (light on the left)20
6intelligent power module at the back (light on the right)10
7Intelligent power module at the rear (tailgate assist)20
8electromechanical parking brake, left motor30
9electromechanical parking brake, motor right30
10trailer control unit (light on the left)15
11trailer control unit (light on the right)15
12trailer control unit10

These diagrams and descriptions are for informational purposes only, check the current location of the fuses with your car manual.

Additional Information

Video example about replacing fuses and repairing the instrument panel backlight.

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