BMW 1992 525i Electrical Troubleshooting Manual page 11

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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. They are arranged on the sheet such that the current path can be
followed from positive (top) to negative (bottom).
Important:
The components and wires are not drawn to scale. For instance, a lead with a
length of over 1m can be shown as a lead which is only a few em long. To enhance the clarity
of the schematics, all connectors and splices between fuses and components as well as be-
tween grounds and components have been omitted. If this information should be required,
it may be referenced in cells 0670.3
Fuse Details
and 0670.4
Ground Distribution.
All circuit symbols used are listed and explained in cell 0140.0
Symbols.
In cell 7000.0
Component Location Chart
all important connectors, ground points and
components are listed in tabular form. It provides a precise description of the component loca-
tions In the vehicle.
In cell 7100.0
Component Location VIews
the locations of the connectors and compo-
nents which are difficult to locate are shown in photographs. In cell8500.0
Connector VIews
diagrams of all connectors with more than three pins are illustrated.
Included in this ETM are foldout block diagrams. These are overviews of the entire system (EGS,
ABS, AC etc.) which helps understand the relationships between various components and con-
trol unit of the system being diagnosed.
Example
General conventions can be explained based on the following schematic example.
HDT 4T ALL TIMES HOT AT ALL TIMES
rr---,P90
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Fl
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FRONT POWER
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i5A
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~s;"IBUTION
L
---..1
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FUSE DETAILS
rr---,P94
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F44
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REAR POWER
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30A
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DISTRIBUTION
BOX
L
---..1
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FUSE DETAILS
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0670.3
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0670.3
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sL _________
_JX293
r--~.;....-..o..;,;~...;,;,~;;..;~;;.,;;;;;~~
K11
88 30
WIPER RELAY
87
4
------==·l""
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CENTRAL
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BODY
r-·---
ELECTRONICS
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X452
(ZKE)
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.4Vl/SW
6100.0
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A
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6160.0-02
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4WSW
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GROUND I
DISTRIBUTION
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0670.4
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~ X493
..... .....
(0
N
0
-.
-.
0
.
0
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0
0
.....
<0
<0
N