12 00... Instructions on component testing

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2005 BMW 745i, 2005 BMW 745Li, 2004 BMW 745i, 2004 BMW 745Li, and 2003 BMW 745i. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

During all inspections and work on engine electrics and electronics, always observe safety regulations and accident prevention specifications.
Always disconnect connectors of control units or components before checking electric wires.

Testing Aids:

Schematics, refer to Wiring Diagrams.
Only ever use test lines, adapters, terminals and test tips manufactured by specialists, refer to Diagnosis Information System, Repair Manual.
The inspection values for component testing are located in the Diagnosis Information System (DIS).
For further technical information, refer to Technical Data.