12 36 014 Removing and refitting/replacing electric motor ECU

WARNING: High-voltage system - danger to life!
The following points must be strictly observed prior to starting work:

De-energize the HIGH-VOLTAGE SYSTEM
Observe SAFETY INFORMATION for working with hybrid cars.
Observe notes on EARTH BONDING SCREW CONNECTIONS

Necessary preliminary tasks:

Clamp off NEGATIVE BATTERY LEAD
NOTE: Before disconnecting the battery cable, it must be ensured that the vehicle goes to sleep. Observe a waiting period of at least 2 minutes.
Remove REAR LEFT UNDERBODY PROTECTION
Open sealing cap of coolant expansion tank (high-voltage cooling circuit)

Fig 1: Identifying Electric Motor Connections (ECU)

Courtesy of BMW OF NORTH AMERICA, INC.

Overview of connections on electric motor ECU (EME):

Fig 2: Identifying Electric Motor Unit High Voltage Cable, Protective Plate, Positive Battery Cable And Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

Detach high-voltage cables (1) from protective plate (2).

Detach positive battery cable (3) from protective plate (2).

Unscrew nuts (4).

Tightening torque 12 36 1AZ .

Release screws (5).

Tightening torque 12 36 1AZ .

Unclip coolant hose (6) from holder.

Feed out protective plate (2).

Installation note:

Make sure ventilation duct (7) is correctly seated. Do not pinch ventilation duct (7).

Coolant emerges when coolant lines are detached.

Catch and dispose of escaping coolant.

Observe country-specific waste disposal regulations.

IMPORTANT: Have a container ready to catch the coolant.

Release and disconnect coolant hoses (1).

Unlock and disconnect high-voltage plug connection (2).

Unfasten plug connection (3) and disconnect.

Fig 3: Identifying Electric Motor ECU Coolant Hose, High Voltage Plug Connection And Vent Hose

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Observe NOTES ON PLUG CONNECTIONS on hybrid cars.

Unlock and detach vent hose (4).

Unlock and disconnect high-voltage interlock loop (1).

Release screws (2) from high-voltage plug connection (3).

Tightening torque 12 36 2AZ .

Detach high-voltage plug connection (2) from EME (3).

Fig 4: Identifying EME, High Voltage Plug Connection, Screws And Interlock Loop

Courtesy of BMW OF NORTH AMERICA, INC.

Release nut (1) from grounding cable EME (2) on body.

Pull off grounding cable EME (2) from threaded bolt.

Tightening torque 12 36 3AZ .

Fig 5: Identifying Grounding Cable EME And Nut

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 6: Identifying Electric Motor ECU Interlock Loop, High Voltage Cables, Plug Connection, Cover And Nut

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock and disconnect high-voltage interlock loop (1).

Unclip high-voltage cables (2) from EME.

Unlock and disconnect high-voltage plug connection (3).

IMPORTANT: Observe notes on PLUG CONNECTIONS on hybrid cars.

Unlock cover (4) at marked points and fold down.

NOTE: If replacing, modify cover (4).

Release nut (5) from equipotential bonding line.

IMPORTANT: Observe notes on EARTH BONDING SCREW CONNECTIONS !

Tightening torque 12 36 4AZ .

Release nut (6) from 12 V grounding cable.

IMPORTANT: Observe notes on EARTH BONDING SCREW CONNECTIONS !

Tightening torque 12 36 6AZ .

Release nut (7) from positive battery cable.

Tightening torque 12 36 5AZ .

Unclip 12 V grounding cable (8) from EME.

Installation note:

Make sure contact surfaces are clean.

Detach positive battery cable (1) at EME (2).

Fig 7: Identifying EME And Positive Battery Cable

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Secure EME (1) against falling out.
Check for escaping coolant remnants.

Release screw (2) from EME (1).

Tightening torque 12 36 7AZ .

Undo the nuts (3) from the EME (1).

Tightening torque 12 36 7AZ .

Fig 8: Identifying EME, Screw And Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

Carefully remove EME (1) toward the bottom with an assistant.

After installation:

Fill and bleed COOLING SYSTEM .

Replacement:

Carry out VEHICLE PROGRAMMING/CODING .

Connect BMW diagnosis system:

Service functions
Power train
Hybrid car
Electrical machine electronics
Motor position sensor adjustment

Fit EME grounding cable (1) to new EME (2).

Release screw (3).

Tightening torque 12 36 8AZ .

Installation note:

Make sure contact surfaces are clean.

Fig 9: Identifying EME, Grounding Cable And Screw

Courtesy of BMW OF NORTH AMERICA, INC.