The following electrical troubleshooting manual is applicable for BMW 525i/535i/M5 (E34) car series. Herein you will find brief yet complete information on schematic troubleshooting, electrical components symbol, power distribution chart, fuse chart, ground distribution, component location chart and views, splice location views and connector’s views and chart.
The schematic divide the entire vehicle electric 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 which are arranged on the sheet such that the current path can be followed from positive (top) to negative (bottom).
Find the detail of BMW 525i/535i/M5 (E34) electrical troubleshooting here (368 pages of pdf file docs. PASS: wiringdiagrams21.com)