How to Use the Wiring Diagrams

How to use the wiring diagram

The descriptions below apply in general to all wiring diagrams, although not all sections are necessarily included for this model.

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, e.g. x/2.

Together they comprise a component designation, e.g. 3/2

At the end of the section is a list of components, 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 contains the type numbers and corresponding component types, e.g. 3/x = switch, 6/x = electric motor, etc.

1 Battery
2 Relay
3 Switch
4 Control module
5 Combined instrument panel
6 Electric motor
7 Sensor
8 Actuator
9 Heating element
10 Lamp
11 Fuse
15 Distribution rail
16 Audio
17 Service/diagnostics
18 Contact reel
19 Meter
20 Ignition component/shunt
31 Ground connection
43 Junction point
44 Connector

B. Junction points

The wiring diagrams contain numbered junction points, e.g. 43/352.

This section contains a list of junction points. This list shows all the components which are connected to each junction point.

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 "Connectors". Connector Views

D. Electrical distribution

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

E. Data communication

Today's cars contain a CAN network, which transfers information. The connections to this network are not shown in their entirety on each wiring diagram. Complete information about CAN communications can be found in "Data communications".

F. Abbreviations

A number of different abbreviations are used in the diagrams. These are explained in the section "Abbreviations". Wire Color Code Identification and Other Abbreviations

G. Component location

The appearance and location of components is described in numerical order in "Component Location". Component Locations