Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2018 BMW 640iFACTORY OEM SERVICE PROCEDURE
12 00 Contents of engine electrical system general
General Information:
- -> INSTRUCTIONS FOR WORKING ON THE IGNITION SYSTEM
- -> INSTRUCTIONS FOR REMOVAL AND REPLACEMENT OF CONTROL UNITS
- -> INSTRUCTIONS FOR WELDING WORK (OVERLOAD PROTECTION OF CONTROL UNITS)
- -> NOTES FOR DISCONNECTING AND CONNECTING BATTERY
- -> INSTRUCTIONS FOR CONNECTING AND DISCONNECTING TEST UNITS
- -> INSTRUCTIONS ON COMPONENT TESTING
- -> NOTES/INFORMATION ON START ASSISTANCE (JUMP STARTING)
- -> Compression testing
Factory Service Tools
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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.