On-board electrical equipment specifications (BMW 3 Series E46)

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

Location of electronic control units of vehicle systems on the body

12V incandescent lamps	Type	Power, W
Low beam	H7	55
High beam	H1	55
Front turn signals	R	21
Front parking light	W	5
Front fog light	HB4	55
Side turn signal repeater	W	5
Rear turn signal	P	21
Brake light/tail light	R	21/4
Reversing light	R	21
Rear fog light	R	21
License plate lighting	C11	5
Additional brake light	lED strip1)
Interior lighting	soffit	5
Reading light	XE	6
Backlighting of the leg and pocket area	soffit	5
Trunk/engine compartment lighting	soffit	10
Vanity mirror lighting	soffit	10
1) If one LED fails, the entire brake light must be replaced.

Relay and fuse boxes

Depends on the vehicle's equipment and year of manufacture. The fuse box diagram is located in the glove compartment under the fuse board.

Location of fuses

Relay box location behind glove box

Relay box in the engine compartment

Model 320d shown with cover removed

Colour coding of fuses

Current, A	Color coding
5	Light brown
7.5	Brown
10	Red
15	Blue
20	Yellow
30	Green

Tightening forces of threaded connections

Tightening torques for fasteners are also given in the text of the Chapter and in some illustrations*.

* Tightening torques highlighted in bold in the text must be strictly observed; efforts not shown in bold are only approximate.

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 components discussed below, all lighting fixtures and electrical accessories not directly related to the engine. In addition, diagnostic procedures for general electrical faults are discussed.

When performing any repair or maintenance work on components of the electrical system, it is imperative to first disconnect the negative cable from the battery to avoid electrical injury and/or fire.