How to Use the Wiring Diagrams

How to use the wiring diagram

The descriptions below apply in general to all wiring diagram information, although not all sections are necessarily contained in this information.

A. Component designation

Every component has a component designation that consists of two parts.

The first part is a type number that describes the type of component in question, for example 3/xx.

The second part of the designation is a serial number, for example, x/2.

Combined these give a component designation, for example, 3/2.

There is a list of components at Component ID List, where, with the help of the component designation, you can read off the name of the component, for example, 3/2 = light switch. Diagram Legend

List of type numbers

The list shows which type of component that respective type numbers refer to, for example, 3/x switch, 6/x = electric motor, etc.

1 Battery
2 Relay
3 Switch
4 Control module
5 Driver information module
6 Electric motor
7 Sensor
8 Actuator
9 Heating element
10 Light
11 Fuse
15 Electrical distribution rail/box
16 Audio
17 Service/diagnostics
18 Contact reel
19 Meter
20 Ignition component/shunt
27 Optics
31 Ground connection
53 Junction point
54 Connector

B. Junction points
The wiring diagrams contain numbered junction points, e.g. 53/352.
There is a list of junction points. This list shows all the components that are connected to each junction point. Electrical Diagrams

The location of the junction points is shown in the "Cable harness routing in vehicle". Harness Locations

C. Connectors
Connectors provide a bridge between two cables harnesses and are described in the "Connector Views". Connector Views

D. Electrical distribution
Operation of the fuses and relays is shown in the "Electrical distribution". Diagrams

E. Data communication
Today's cars are equipped with a CAN network, which transmits information. Connections to this network are shown in their entirety on the respective wiring diagrams. Complete information on CAN communication can be found in "Data communication". Diagrams

F. Abbreviations
A number of different abbreviations are used and these are explained in "Wire Colour Code Identification and Other Abbreviations". Wire Color Code and Other Abbreviations

G. Component location
The appearance and location of components is described in numerical order. A - Z Component List