WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2006 BMW M3, 2005 BMW M3, 2004 BMW M3, 2003 BMW M3, and 2002 BMW M3. However, it is still accessible from the selected car via links, so may be relevant.

CONTENTS OF ENGINE ELECTRICAL SYSTEM GENERAL

General Information:

_>Working on ignition system, refer to 12 00 ... INFORMATION ON WORKING ON IGNITION SYSTEM .
_>Removing and installing electronic control units, refer to 12 00 ... INSTRUCTIONS FOR REMOVING AND INSTALLING ELECTRONIC CONTROL UNITS .
_>Welding work (overload protection of control, refer to 12 00 ... INSTRUCTIONS FOR WELDING WORK (OVERLOAD PROTECTION OF CONTROL UNITS) .
_>Disconnecting and connecting battery, refer to 12 00 ... INSTRUCTIONS FOR DISCONNECTING AND CONNECTING BATTERY .
_>Disconnecting and connecting test equipment, refer toDISCONNECTING AND CONNECTING TEST EQUIPMENT .
_>Component inspection, refer to 12 00 ... INSTRUCTIONS ON COMPONENT INSPECTION .
_>External jump-starting aid, refer to 12 00 ... INSTRUCTIONS ON STARTING AID .

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

12 00 Contents of Engine Electrical System General

Use the Manual With the Right Hardware

When to See a Mechanic