Electrical Equipment Specifications (Audi A4 B6)

Table of contents: 12V incandescent lamps ↓ Electrical fuses ↓ Coloured markings of fuses ↓ Purpose of fuses ↓ Relay ↓ Location of the main electrical… ↓

Cars of this brand are equipped with a 12 V electrical system with grounding on the negative pole. Power for all lighting devices and electrical units is provided by a lead-acid battery, recharged by an alternator.

This Chapter describes the maintenance and repair procedures for certain components of the on-board electrical system, which include, in addition to the specific ones discussed below, all lighting fixtures and electrical accessories not directly related to the engine. In addition, diagnostic procedures for general electrical faults are discussed. Information on the battery, alternator, and starter is provided in Chapter Engine electrical systems.

Caution: When performing any repair or maintenance work on electrical components, it is imperative to first disconnect the battery ground cable to avoid electrical shock and/or fire.

Warning: Individual characteristics are also given in the text of the Chapter and, if their implementation is mandatory, are highlighted in bold.

12V incandescent lamps

Purpose	Base, Type	Power, W
High beam	H7	55
Low beam, halogen/xenon	H7/D2S	55/35
Fog lights	H11	55
Parking light	W	5
Front direction indicators	PY	21
Side turn signal repeaters	WY	5
Rear direction indicators	PY	21
Side lights	R	5
Brake lights	R	21
Fog lights	R	21
Reversing lights	R	21
License plate lights	WITH	6
Reading light	R	6
Ceiling lamp front	WITH	10
Interior/ trunk lighting shades	WITH	6
Storage box/trunk	W	5
Footwell/entrance area lighting	W	5

Characteristic	Meaning
H7/H11	Halogen lamp
D2S	High voltage xenon lamp
R	Bayonet socket
W	Glass base
WITH	Soffit
Y	Color orange

Electrical fuses

Fuse box cover. Left end side of instrument panel

Fuse board in the instrument panel

Coloured markings of fuses

Color	Maximum current, A
Light brown	5
Red	10
Blue	15
Yellow	20
Natural (white)	25
Green	30

Purpose of fuses

Some of the consumers listed are specific to certain models or are included in the custom package. In case of discrepancies, the data provided on the sticker on the inside of the fuse cover shall prevail.

№	Consumer	Current strength, A
1	Air conditioner	10
2	Footwell Lights	5
3	Heated windshield washer jets	5
4	Cooling system fan	5
5	Telephone, Engine Oil Level Sensor, Multi-Function Switches, Rear Seat Heating, Rear Window Sunshade, Automatic Transmission (gear shift linkage)	10
6	Air conditioner (air quality sensor), pressure sensor	5
7	Electronic skid control system (ESP), brake light switch, clutch pedal sensor, steering wheel angle sensor	10
8	Telephone	5
9	Brake booster (vacuum pump)	15
10	Automatic headlight range control	10
11	Absent
12	Diagnostic socket	10
13	Steering column module	10
14	Brake signal lights	10
15	Instrument panel, navigation system	10
16	Garage door opener	5
17	Parking assistance, ride height adjustment, tire pressure monitoring	10
18	Absent
19	Fog lights, rear fog lights	15
20	Right low beam headlight, headlight range adjuster	15
21	Left low beam headlight, headlight range adjuster	15
22	Driver's door	15
23	Front passenger door	15
24	Comfort electrical equipment with single control	20
25	Heater fan	30
26	Rear window heating	30
27	Trailer socket (control unit)	30
28	Fuel pump, additional pump for diesel engine	20
29	Engine management	20
30	Lift and slide roof panel	20
31	Reversing lights, automatic transmission, diagnostic socket, auto-dimming interior mirror	15
32	Engine management	20
33	Cigarette lighter	15
34	Engine management	15
35	Socket in the trunk	30
36	Wiper	30
37	Windshield and headlight washer pump	25
38	Comfort electrical equipment with single control, trunk release	15
39	Radio system	20
40	Sound signal	25
41	Absent
42	Electronic skid control system (ESP)
43	Engine management	15
44	Heated seats	30

Power windows and seats are controlled overload protection devices for electrical circuits. After the overload has been eliminated (for example, in case of frozen glass) they turn on again automatically after a few seconds.