How to Use the Wiring Diagrams

How to use the wiring diagrams

The descriptions below apply in general to all wiring diagrams, although not all sections are necessarily contained here.

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, this constitutes a component designation, e.g. 3/2.

At the end of the information 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.

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
26 Converter
27 Optics
31 Ground connection
53 Branching point
54 Connector

The systems are displayed in non-active status, i.e. in the event of "key removed" and when doors, trunk lid/tailgate and hood are closed.

B. Branching points
The wiring diagrams contain numbered junction points, e.g. 53/352.

This information contains a section with a list of branching points. This list shows all the components that are connected to each branching point.

The location of the branching points is shown in the "Cable harness routing in vehicle" in Vehicle Level Harness Locations images.

C. Connectors
Connectors provide a bridge between two cable harnesses and are described in the "Connectors" in Vehicle Level Connector views.

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

E. Data communication
Today's cars are equipped with CAN, LIN & MOST networks that transmit information. Connections to these networks are not shown in their entirety on the respective wiring diagram. Complete information on Data communication can be found "Control modules" in Information Bus.

F. Abbreviations
A number of different abbreviations are used in the information. These are explained in "Wire Color Code and Other Abbreviations".

G. Component location
17 Service/diagnostics There is a section at the end of the appearance and location of components is described in numerical order.