Introduction

INTRODUCTION:

Schematics:

The schematics divide the entire vehicle electrical system into individual circuits. Interacting electrical components are shown on one common schematic.

Switches and other components are represented in such a way that their general layout and function are self-explicit.

Important: The components and wires are not drawn to scale. For instance, a lead with a length of over 1 m can be shown as a lead which is only a few cm long.

Example:

Introduction (schematic example):

The following example shows how to read the schematic of the E-box fan.

The schematic shows the following: (see schematic example)

With the ignition on (terminal 15) voltage is applied via fuse F28 at pin 2 of the E-box fan and via fuse F17 at pin 7 of the instrument cluster. When the temperature switch closes at a temperature above 44 °C, or the oil pressure switch at a pressure below 0.2 bar, ground is switched through to the E-box fan. The power circuit is closed and the fan operates. When the oil pressure switch is closed (oil pressure too low) ground is additionally connected to pin 6 of the instrument cluster and the oil pressure warning lamp lights in the instrument cluster.

General conventions can be explained based on this schematic example.

General conventions:

1. Switches are always shown in rest position (e.g. B206 and B210).

2. A component shown in a dashed frame signifies that the component is illustrated only in part (e.g. P90 and A2).

3. A component shown in a completely drawn frame signifies that the component is illustrated in full (e.g. M201 B206 and B210).

4. The dashed line between pin 1 and pin 3 at connector X1552 indicates that both pins belong to connector X1552.

5. The dashed line with an arrow at connector X199 indicates that several wires lead to connector X199. All lines leading to a connection are illustrated in Fuse Details.

6. The uninterrupted line with an arrow at connector X201 indicates that the 0.75 GN/WS wire leads to another circuit. Fuse Details shows to which circuit the wire belongs.

7. The dashed lines with arrows at connections X1908 and X1542 indicate that ground is applied. Refer to Ground Distribution for complete illustration of the line layout. The dashed line to connector X1908 also indicates that several wires lead to this connection.