Pic. 9.36. Mounting block location: 1 – ABS/ETS controller; 2 – EDS controller; 3-pin connectors for various electronic devices (depending on configuration); 4 - double valves of the heating system
Most consumers have two wires connected. But usually only one of them can be traced to the battery or generator. Another wire is often already a few centimeters attached to the metal parts of the body, engine or gearbox. This is a clear example of how automakers used for their purposes a physical principle, according to which metal parts, called auto electrics «weight», conduct current. Thus, a large number of wires are saved for closing the circuit from the consumer to the negative terminal of the battery, transferring this function «mass». If any consumer is not working, often the cause is lost contact with «weight». In this case, contact with «weight» this consumer is carried out through workarounds, which causes disturbances in the overall system. To work with electrical equipment, you need a certain exposure. The fuse tables and wiring diagrams in this book will help you figure it out. Mounting block (pic. 9.36) It is located under the splash and water cover in the rear right side of the engine compartment.
The negative battery cable is connected to «weight»
The current is supplied to the consumer through a wire, the path of which, with more or less difficulty, can be traced to the battery, which is also reflected in the wiring diagrams. The return circuit is provided by conductive metal parts of the body or engine. This saves a lot of wiring. In some cases, a short wire is still required for the return circuit - usually when the consumer is located directly on metal parts. These so-called wires «masses» always lead to points or contacts «masses», distributed over the body and to which the ends of the wires are connected on threaded connections.
The negative terminal of the battery is connected to the body or «weight», as auto electricians call it. Always remember this: «minus» connects with «weight».