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 MANUALSBMW2011128I CONVERTIBLE (E88) L6-3.0L (N51)REPAIR AND DIAGNOSISRELAYS AND MODULESRELAYS AND MODULES - POWER AND GROUND DISTRIBUTIONPOWER DISTRIBUTION MODULESERVICE AND REPAIR
2011 BMW 128i Convertible (E88) L6-3.0L (N51)
Power Distribution Module: Service and Repair
2011 BMW 128i Convertible (E88) L6-3.0L (N51)SECTION Service and Repair
61 42 ... Removing And Installing/replacing DC/DC Converter
NOTE:
DC/DC converter in vehicles with automatic start-stop function.
There are two versions:
- Without additional bracket for diesel engine vehicles
- With additional bracket for petrol engine vehicles
Depending on the equipment, one or both versions are installed in the M3
IMPORTANT: Read and comply with information on protection against damage from electrostatic discharge .
Necessary preliminary work:
Remove lower section of microfilter housing (all except M3)
Remove right upper section of microfilter housing M3
Unlock fasteners (1) from below and slide upwards approx. 10 mm.
Unlock locks (2) in direction of arrow.
Remove cover (3).
Diesel engine vehicles (without additional bracket):
Release lugs in direction of arrow. Remove DC/DC converter (1) by pulling upward. Disconnect plug connection (2).
Petrol engine vehicles (with additional bracket):
Release lugs in direction of arrow. Remove DC/DC converter (1) by pulling upward. Disconnect plug connection (2).
M3:
Release tabs in direction of arrow and remove DC/DC converter with additional bracket (1) upward. Disconnect plug connection (2).
Release tabs in direction of arrow and remove DC/DC converter without additional bracket (3) upward. Disconnect plug connection (4).
IMPORTANT: Do not mix up plug connections (2, 4)
RENDER: 1.0x
NO RELATED
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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.