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.
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HOMESERVICE MANUALSBMW2009335DREPAIR AND DIAGNOSISENGINE PERFORMANCEIGNITION SYSTEMENGINE ELECTRICAL SYSTEM - REPAIR
2009 BMW 335d
Engine Electrical System - Repair
2009 BMW 335dSECTION Engine Electrical System - Repair
- 1200 troubleshooting
- 61 20... Battery replacement information
- 12 00... Instructions for disconnecting and connecting battery
- 61 00... Notes on handling wiring harnesses and cables
- 12 00... Notes/information on removing and installing control units
- 12 00... Notes/information on start assistance (jump starting)
- 00 Safety information for working on vehicles with automatic engine start-stop function (MSA)
- 1214 electronic switching or control units
- 1221 preheating relay
- 1223 preheater plugs
- 1231 alternator with drive and mounting
- 12 31 009 Checking alternator (BSD)
- 12 31 009 Checking alternator and regulator switch
- 12 31 020 Removing and installing/replacing alternator (M57TU, M57T2)
- 12 31 020 Removing and installing/replacing alternator (M57TU, M57T2, M47T2)
- 12 31... Replacing alternator belt pulley
- 12 31... Replacing alternator belt pulley (with overrunning clutch)
- 1232 regulator
- 1241 starter with mounting
- 1251 engine wiring loom
- 1261 oil pressure/oil temperature/oil gauge
- 1290 control unit box
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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.