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 MANUALSBMW2011335I 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCEIGNITION SYSTEMENGINE PERFORMANCE - FUNCTIONAL DESCRIPTION -- E90ENGINE PERFORMANCE - FUNCTIONAL DESCRIPTIONAUTOMATIC ENGINE START-STOP FUNCTIONSYSTEM OVERVIEW
2011 BMW 335i 4D Sedan, Automatic
System overview
2011 BMW 335i 4D Sedan, AutomaticSECTION System overview
The following system overview shows an example of the functional networking of the automatic engine start-stop function for vehicles with manual transmission and junction box electronics (JBE).
| Item | Explanation |
|---|---|
| 1 | Electronic Power Steering (EPS) |
| 2 | Dynamic stability control (DSC) |
| 3 | Engine compartment lid contact switch |
| 4 | Brake vacuum sensor |
| 5 | Digital engine electronics |
| 6 | Starter motor |
| 7 | Zero-gear sensor |
| 8 | Junction Box Electronics (JBE) |
| 9 | Fuse carrier, rear |
| 10 | DC/DC converter |
| 11 | Intelligent battery sensor |
| 12 | Battery |
| 13 | Power distribution box, battery |
| 14 | Seat belt buckle switch, driver's side |
| 15 | Instrument panel (KOMBI) |
| 16 | Clutch module |
| 17 | Integrated chassis management (ICM) |
| 18 | Steering column switch center (SZL) |
| 19 | Crash Safety Module (ACSM) |
| 20 | Automatic engine start-stop function button |
| 21 | Car access system (CAS) |
| 22 | Footwell module (FRM) |
| 23 | Door lock, driver's side |
| 24 | Central gateway module (ZGM) |
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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.