Separate characteristics are also given in the text of the Chapter and, if they are mandatory, are highlighted in bold.
The location of the electronic control units of vehicle systems on the body
Incandescent lamps 12 V | Type | Power, W |
dipped beam | H7 | 55 |
high beam | H1 | 55 |
Front turn signals | R | 21 |
parking light front | W | 5 |
Front fog lamp | HB4 | 55 |
Side repeater | W | 5 |
Rear turn signal | P | 21 |
Stop/tail light | R | 21/4 |
reversing lamp | R | 21 |
Rear fog light | R | 21 |
License plate lighting | C11 | 5 |
Additional brake light | led bar1) | |
Interior lighting | soffit | 5 |
Reading light | XE | 6 |
Illumination of the leg area, pocket | soffit | 5 |
Trunk/engine compartment lighting | soffit | 10 |
Makeup mirror light | soffit | 10 |
1) If one LED fails, the entire brake light must be replaced. |
Relay and fuse boxes
Depends on the equipment of the car and the year of its manufacture. The fuse diagram is located in the glove box under the fuse board.
Fuse Location
Location of the relay box behind the glove box
1 - fuel pump relay;
2 - heater fan relay
3 - fog lamp relay
4 — the relay of sound signals
Relay box in the engine compartment
320d model shown with cover removed
1 - DDE main relay (320d), ignition coil relay, terminal 15 (320i, 323i, 328i).
2 - preheat control device (320d), DDE main relay (all petrol engines)
3 - wiper relay
Fuse color coding
Current, A | Color coding |
5 | Light brown |
7.5 | Brown |
10 | Red |
15 | Blue |
20 | Yellow |
30 | Green |
Tightening torques for threaded connections
Fastener tightening torques are also given in the text of the Chapter and in some illustrations*.
* The tightening torques shown in bold type must be strictly adhered to; Efforts not in bold type are indicative only.
Cars of this brand are equipped with a 12 V electrical system with negative grounding. All lighting fixtures and electrical units are powered by a lead-acid battery recharged by an alternator.
This Chapter is devoted to the description of the maintenance and repair procedures for some components of the onboard electrical system, which include, in addition to the specific ones discussed below, also all lighting devices and electrical accessories not directly related to the engine. In addition, the procedures for diagnosing malfunctions of electrical equipment of a general order are considered.
When performing any repair and maintenance work on the components of the electrical system, it is imperative to first disconnect the negative cable from the battery to prevent electrical injury and / or fire.