Therefore, the ground wire from the battery is connected to the body. However, this earth connection is often not enough, and the corresponding consumer is connected to earth directly by a earth wire, the insulation of which is usually brown. Separate current circuits include relays, switches, fuses, measuring elements, electric motors and other electrical elements. For their correct connection, these elements are marked on their contacts.
For ordering on the electrical circuits of the interweaving of wires, individual current circuits are arranged vertically on the diagrams and numbered. Interacting electrical elements are depicted in one general diagram.
As a rule, the connections of the current circuits to the plus of the supply are shown in the upper part of the electrical diagram, while the connections to ground are shown in the lower part of the diagram. The ground connection is usually made by connecting the unit body to the body, however, in some cases, ground can be supplied through a separate wire from the ground point on the body.
Attention: Images of elements and wires are not to scale. Tai, for example, a wire longer than 1 m is depicted by a line of several centimeters.
The designations of the most important terminals are as follows: Terminal 15 is written through the ignition switch. Voltage is present at the terminal only after the ignition is turned on. The wires are most often black or black with colored stripes.
Terminal 30. Battery voltage is always present at this terminal. The wires are most often red or red with colored stripes.
Terminal 31 is connected to ground. Ground wires are mostly brown.
- Switches are always shown in the de-energized state; here, for example, K11.
- A dashed frame around a circuit element means that the element is displayed in full; here, for example, K11.
- The dashed line between pin 8 and pin b on connector X293 means that both pins belong to connector X293.
- The dashed line from fuse F1 to pin 8 of connector X293 represents the positive power supply from relay K11.
- The dashed line with an arrow at the X452 connector indicates that there are multiple wires going to the X452 connector.
- The dashed line from terminal 4 of connector X293, g to the mass point X493 to the mass point X493 displays the mass supply from relay K11.
- The solid line from connector X452 with the letter A in the open arrow indicates the current loop where the current path continues. A wavy line interruption of the 4 VI/SW wire from connector X452 indicates that the wire continues in the following wiring diagram.
Electrical circuits
Since the original wiring diagrams for all BMW 3 Series models are approximately 1000 pages long, the diagrams shown here are limited to the 316i, 318i and 325td models. In new editions, the current electrical circuit is published, according to which owners of older models can also navigate.
Conventions
- Battery
- Sicherung - Fuse
- Sollschmelzteile - Fuse links
- Sicherungsautomat - Automatic fuse
- Magnetspule - Electromagnet Coil
- Magnetventil - Solenoid valve
- Widerstand - Resistance
- Heizelement - Heating element
- Lautsprecher oder Signalhom - Loudspeaker or horn
- Gluhlampe - Incandescent lamp
- Dauermagnetmotoreine Drehzahl - Single speed permanent magnet motor
- Dauermagnetmotorzwei Drehzahlen - Two speed permanent magnet motor
- Potentiometer Schleiferwird durch auBere Kraft bewegt - Potentiometer. The engine is moved by an outside force
- Potentiometer Anderung durch Druck or Temperatur - Potentiometer. Change in resistance from changes in pressure or temperature
- Diode Strom flieBt nur in Pfeilrichtung - Diode Current flows in the direction of the arrow
- Z-Diode zur Spannungsregelung - Zener diode for voltage regulation
- Leuchtdiode - LED
- Lambdasonde - Lambda probe
- Zundspule - Ignition coil
- Steuer-/Leistungselektronik - Electronic control/gain circuit
- Radio - Radio receiver
- Transistorschalter - Transistor key
- Klopfsensor - Knock sensor
- Heizelement - Heating element
- Gesamtes Bauteil - Whole element
- Teil eines Bauteils - Part of the element
- Bauteil mit Schraubenklemmen - Threaded element
- Bauteilgehause, direkt mit Fahrzeugmasse verbunden - Element housing directly related to vehicle mass
- Steckverbinderam Bauteil angeschlossen - Connector connected to the element
- Steckverbinder mit AnschluBleitung des Bauteils verbunden - Connector connected to the element connection wire
- Einpoliger Ein-/Ausschalter - Single pole switch
- Zweipoliger Schalter Strichlinie bedeutet mech-anische Verbindung zwischen Schaltern - Two-pole switch. The dashed line indicates the mechanical connection between the switches
- Sicherung liegt standig im Strompfad - A fuse included in the current circuit
- einfarbige Leitungsisolierung - single color wire insulation
- Stiftnummer - pin number
- Stecker-Bezugsnummer fur Lageverzeichnis der Bauteile - The serial number of the connector in the list of elements
- Leitungsisolation mit Farbstreifen (Griin und WeiB) - Insulation with colored stripes (green and white)
- Wellenlinie bedeutet Fortsetzung der Leitung - The wavy line means the continuation of the wire
- Zwei Steckerstifte in denselben Steckverbinder - Two pins of one connector
- Strichlinie bezeichnet AnschluBpunkte desselben Steckverbinders - The dashed line indicates the connection points of one connector
- An Karrosseriteil befestigte Leitung (MasseanschluB) - Wire attached to the body (earth connection)
- Nummerierter MasseanschluВ fur Bezugnahme in Lageverzeichnis der Bauteile - Serial number of the mass connection according to the list of elements
Figure W-7076
- Stromverteilerkasten Motorraum - Junction box in the engine compartment
- Stromverteilerkasten unter Rucksicht - Junction box under rear seat
- Sicherungsdetails - Fuse diagram details
- Wischerrelais - Wiper relay
- Zentrale Karosserie-Elektronik (ZKE) - Central body electronic circuit (ZKE)
- MasseanschluB - Mass connection
Figure W-7079
- SchlieBer-Relais - Connection relay
- SchlieBer-Relais mit Schutzwiderstand - Connection relay with protective resistor
- SchlielBer-Relais mit 2 Ausgangen - Connection relay with 2 outputs
- Wechsel-Relais mit 2 Ausgangen - Switching relay with 2 outputs
- Dreipoliger Verstellungsschalter - Three-pole switch
- Klemmen no. - Terminal number
- Bauteil Nr. - item number
- Benennung des Bauteils - Element name
- Ziindschalter 0 = Aus 1 = Radiostellung 2 - Zundung 3 - Anlassen - Ignition switch 0 = off 1 - radio position 2 - ignition 3 - starter
- Einzelheiten uber Bauteil oder Betrieb - Details about the element and function
- "R" wird in Stellung 1,2 or 3 mit Batteriespannung versorgt - On "R" battery voltage is applied in positions 1, 2 or 3
- Sicherung liegt standig im Strompfad - The fuse is constantly in the current circuit
Figure W-7080
- Stromverteilerkasten unter Riicksitz - Junction box under rear seat
- Crash-Alarmgeber - Crash alarm sensor
- Beispiel: Stecker C Pin 17 und C Pin 11 gehen zu Bauteil M17, Stecker A Pin 23 und A Pin 20 gehen zu Bauteil M12 - Example: pin 17 of connector C and pin 11 of connector C go to element M17, pin 23 of connector A and pin 20 connector A go to element M12
- ZV-Antrieb Heckklappe - Central locking drive for rear lid
- ZV-Antrieb-Fahrertur - Driver's door central locking drive
- ZKE-Zentralverriegelung - Central locking system
- Gestrichelte Line bedeutet, daB mehrere Leitungen miteinander verbunden sind - A dashed line means that several wires are connected.
- Keine Pin- und Steckemummeran den Bauteilen - No pin numbers or connector designations are marked on the elements
- DWA-Modul - Intruder alarm system module
- In diesem Kapitel wird das System genau beschrieben - The system is detailed in this section
- Diebstahlwarnanlage III (DWA III) - Burglar alarm system III (DWA III)
- Bezeichnung der einzelnen Stecker am Steuergerat - Designation of a separate connector on the control unit
- Pin- und Steckemummer nur am Steuergerat - The pin and socket numbers are only indicated on the control unit
- ZKE-Scheibenwisch-/waschanlage - Wiper and washer system
- Scheibenwischerschalter - Wiper switch
- Wischermotor - Washer motor
- Turkontaktschalter Beifahrerffir - Front passenger door contact switch
- Turkontaktschalter Fahrertur - Driver door contact switch
- Turkontaktschalter Tur hinten rechts - Rear right door contact switch
- Tuirkontaktschalter Tur hinten links - Rear left door contact switch
- Beispiel: Stecker C Pin 1 geht zu Bauteil S13, Stecker B Pin 15 geht zu Bauteil S14 - Example: pin 1 of connector C goes to item S13, pin 15 of connector B goes to item S14. Distribution boxes
Figure W-7081
- Sicherungen - Fuses
- Relais Elektrische Kraftstoffpumpe - Electric fuel pump relay
- DME-Relais - relay
- DME Lambdasonden-Relais - Lambda probe relay
- Fanfarenrelais - Fanfare relay
- Nebelscheinwerferrelais - Fog lamp relay
- Fernlichtrelais - high beam relay
- Fahrlichtrelais - Low Beam Relay
- Wamblinkrelais - Alarm Relay
- Heizungsgeblaserelais - Heating fan relay
- Relais ftir heizbare Fleckscheibe - Heated rear window relay
- ABS-Uberspannungsschutzrelais - ABS overload protection relay
- ABS-Pumpenmotorrelais - ABS pump motor relay
- Relais Zusatzlufter Stufe 2 - Auxiliary fan relay stage 2
- Relais fur Klimakompressor - Air conditioning compressor relay
- Relais Zusatzlufter Stufe 1 - Auxiliary fan relay stage 1
Figure W-7082
Relay board under the dashboard on the left.
- Relaisbox Stand heizung/Standluftung - Relay box for parking heating and ventilation
- Doppelrelaismodul - Double relay module
- Crash-Alarmgeber - Crash alarm sensor
- Scheinwerferreinigungsmodul (SRA) - Headlight cleaner module (SRA)
- Komfortrelais - Comfort relay
- nichtgebraucht - not used
Wire Color Designations
- BL - blue
- BR - brown
- GE - yellow
- GN - green
- OR - orange
- RS - pink
- RT - red
- SW - black
- VI - purple
- WS - white
- TR - transparent