E39 series BMW 5

since 1996-2001 of release

Repair and car operation

Work with electric circuits

For possibility of determination of malfunction or additional installation of electric devices existence of electric circuits is necessary. The electric chain should be surely closed. Insufficiently, for example, if tension, and other plug is brought to the positive plug (+) headlights (-) is not closed on weight.

Therefore the cable of weight of the storage battery (-) is connected to weight. In some cases it appears such communication with weight insufficiently and the corresponding consumer has a direct connection with weight. Isolation of such communication has, as a rule, brown color. Separate electric chains can have switches, the relay, safety locks, measuring devices, electric motors and other electric elements. That the specified elements are correct for attaching, connecting cables have various colors, and contacts have numbering.

For convenience of work with car electric equipment all system is divided into separate chains. The electric elements cooperating with each other, are shown on the general scheme.

As a rule, at the top of the scheme positive contacts (+), and below weight contacts are given (-). Connections of weight are carried out usually through a body or through an additional wire from a point of the weight which is available on a body.

The image of electric elements on the scheme is executed not in scale. For example, the cable in length of 1 m on the scheme has length only in some centimeters.

Designations of the major plugs:

Plug 15. Receives a food from the ignition lock. A food moves only at the included ignition. Cables have black color or black with color strips.
Plug 30. On this plug tension of the storage battery constantly moves. Cables in the majority a case have red color or red with strips.
Plug 31. Conducts to weight. Wires of weight have, as a rule, brown color.
On electric circuits all consumers and switches are represented in a starting position. Below movement of an electric current speaks an example of the two-level switch at implementation of switchings in the switch.

If on the switch the first step is pressed, the electric current flows from the plug 82 to the plug 83. The switch of the second step occupies average situation, without carrying out connection. Only by pressing of the second step the switch connects the internal conductor 82 to the conductor 84 and transfers an electric current further. Thus there is closed a chain from the plug 82 to the plug 83 thanks to internal branch in the switch.

On the following example rules of reading an electric circuit are shown.

1) Designation of plugs, here plug 30.
2) The shaped line between conclusions 8 and 2 to the X293 tip specifies that both conclusions belong to the X293 tip.
3) The shaped line from F1 safety lock to a conclusion 2 Ch293 tips shows a positive wire from the K36 relay.
4) Rated current of a safety lock, here: 30 And.
5) Switches and the relay are shown always in a starting position. The element represented by the continuous line, means that it is represented completely, here К36.
6) Element designation, here К36.
7) Element name, here relay of a cleaner 1.
8) the Shaped line from F26 safety lock to a conclusion of the 8th X293 tip shows a positive wire of management from the K36 relay.
9) The element represented by the shaped line, means that it is represented not completely, here: Base A1 module.
10) Conclusion designation.
11) The double line from a conclusion 2 X107 tips to a point of weight Х490 shows a weight wire to the electric motor of the pump of a stekloomyvatel М4.
12) Point of weight Х490.
13) Color of a cable, here: BR/V1 - brown/violet
14) Tip designation, here: Х295.

Designations of the major elements following:

A-holder safety lock/device management/module
B-temperature sensor
E-lamps
F-safety lock
H-sound signal/index turn/stoplight
K-relay
M-electric motor
N-radio receiver
R-potentiometer
S-switch
V-valve
X - the tip or a weight point
Y-external mirror