General

General

The wiring schematics given in this section represent detailed electrical circuit information for BMW E39 5 Series models. Each diagram shows the wiring, connectors, terminals, and electrical or electronic components of the circuit. It also identifies the wires by color or terminal coding.

Wiring diagrams are necessary to troubleshoot and repair electrical or electronic circuits. Remember that electrical and electronic circuits often have more than one source of power and/or ground. In many cases the ground may also be a switched ground. Take time to study the schematics of the entire system to understand the circuit logic prior to circuit troubleshooting.

When working on electrical or electronic circuits, general precautions should be observed. The following is a listing of common sense safety precautions that you must observe at all limes:

CAUTION:
- On cars equipped with airbags and pyrotechnic seatbelt retractors, special precautions apply to any electrical testing or repair These components are explosive devices and must be handled with extreme care. Before starting any work, refer to the warnings and cautions in Seat Belts and Airbag Systems (SRS).
- Prior to disconnecting the battery read the battery disconnection cautions.
- Connect and disconnect ignition system wires, multiple connectors and ignition test equipment leads only while ignition is switched off. Keep clothing, hands, and feet dry if possible.
- Always switch a test meter to the appropriate function and range before making test connections.
- Always switch the ignition off and disconnect the negative (-) battery cable before removing any electrical components.