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 MANUALSBMW2021M8 GRAN COUPE BASEREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTWIPER/WASHER SYSTEMSGENERAL ELECTRICAL SYSTEM -- REPAIR (F91, F92 & F93)61 35 CONTROL UNITS, MODULES61 35 278 REMOVING/INSTALLING BODY DOMAIN CONTROLLER (BDC) CONTROL UNIT (WITH HOLDER)REMOVE THE BDC CONTROL UNIT
2021 BMW M8 Gran Coupe Base
Remove the BDC control unit
2021 BMW M8 Gran Coupe BaseSECTION Remove the BDC control unit
Preliminary work
- Refer to DEACTIVATING VEHICLE ELECTRICAL SYSTEM .
- Refer to REMOVING FOOTWELL TRIM PANEL ON THE RIGHT .
- Refer to REMOVING THE INNER DOOR SILL COVER STRIP .
- Refer to REMOVING THE SIDE TRIM PANEL IN THE FOOTWELL AT THE RIGHT-HAND A-PILLAR .
WARNING:
Work on components with requirements for a secure energy supply
Ensure proper function after a repair
Ensure proper function after a repair
- Lines are allowed to have only one repair area.
- Notices in the diagnostic system circuit diagrams must be observed.
Refer to ADDITIONAL INFORMATION .
- When components are replaced, the notices in the applicable BMW parts catalogue must be observed.
- Fold the carpet (1) to the side.
- Release screw (2)
the cover (3)
.
- Loosen the detents (1) .
- Guide out cover (2)
in the arrow direction.
- Unlock and disconnect all connectors (1) .
- Swivel out BDC control unit (2)
slightly in the arrow direction.
- Unlock and disconnect all connectors (1)
.
- Guide out the BDC control unit (1)
.
- Unlock and disconnect the connector of the positive battery cable (3) on the BDC control unit (4) .
The following order must be maintained:
- Release lock (1) in the arrow direction.
- Release detent (2) at connector of positive battery cable (3) .
- Remove the connector of positive battery cable (3) in the arrow direction.
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.