12 51 001 Replacing wiring harness section for engine (N55 Hybrid)

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 handling hybrid cars.

Attention!

Aluminum screws/bolts must be replaced each time they are released .

Aluminum screws/bolts are permitted with and without color coding (blue).

For reliable identification:

Jointing torque and angle of rotation must be observed without fail (risk of damage) .

Attention!

Read and comply with notes on PROTECTION AGAINST ELECTROSTATIC DISCHARGE (ESD PROTECTION) .

Necessary preliminary tasks:

Read out the fault memory of the DME control unit.
Switch off ignition.
Disconnect BATTERY EARTH LEAD .
Disconnect BATTERY EARTH LEAD of auxiliary battery and cover.
Remove right SUSPENSION CROSS-BRACE .
Remove SOUND INSULATION for middle and rear bulkhead.
Remove intake PLENUM .
Partially detach WIRING HARNESS for injectors and ignition coils.
Pull off and disconnect connector to wiring harness section for engine from the E-MACHINE ELECTRONICS (do not remove E-machine electronics).
Remove FAN COWL .
Remove front UNDERBODY PROTECTION .
Remove rear UNDERBODY PROTECTION .

Disconnect connectors (1) and (2) and release from the carrier plate (3).

Disconnect all connectors from engine wiring harness on the carrier plate and release from the carrier plate (3).

Installation note:

Make sure rubber grommets are correctly fitted (watertightness).

Fig 1: Identifying Engine Wiring Harness Carrier Plate And Connectors

Courtesy of BMW OF NORTH AMERICA, INC.

Unclip grommet hold-down device (1).

Release wiring harnesses (2) from bulkhead.

Fig 2: Identifying Grommet Hold Down Device And Wiring Harness

Courtesy of BMW OF NORTH AMERICA, INC.

Release positive battery cable (1) from cable channel.

Disengage cable channel cover (2) to the left and lift out.

Expose wiring harnesses.

Fig 3: Identifying Engine Wiring Harness Positive Battery Cable And Cable Channel Cover

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock connector (1) and pull off.

Release wiring harness from bracket (2).

Fig 4: Identifying Engine Wiring Harness Bracket And Connector

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock all connectors (1) from control unit and disconnect.

Installation note:

Make sure grommets are correctly fitted (watertightness).

Fig 5: Identifying Engine Control Unit Connectors

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1) below cable channel (2).

Replace aluminum screws.

Tightening torque 13 53 10AZ .

Fig 6: Identifying Cable Channel And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Tightening torque 12 90 8AZ .

Release cable channel (2).

Installation note:

Reconnect the earth connection.

Replace aluminum screws.

Fig 7: Identifying Cable Channel And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock and disconnect following connectors and lines
Unlock connector on charging pressure sensor and disconnect
Unlock connector on hot film air mass meter and disconnect
Pull off and disconnect the connector from the pressure sensor on the intake plenum.
Unlock connector on oxygen sensor and disconnect
Unlock connector on monitoring sensor and disconnect
Unlock connector on pressure converter and disconnect
Unlock connector on rail pressure sensor and disconnect
Unlock connector on tank vent valve and disconnect
Unlock connector on starter motor and disconnect
Unlock connector on the knock sensors and disconnect
Unlock connector on oil temperature sensor and disconnect
Unlock connector on fuel low-pressure sensor and disconnect
Unlock connector on throttle body and disconnect
Unlock connector on high pressure pump and disconnect
Unlock connector on alternator and disconnect
Unlock connector on air conditioning compressor and disconnect
Unlock connector on oil level sensor and disconnect
Unlock connector on crankshaft sensor and disconnect
Unlock connector on heating element for air duct and disconnect
Unlock connector on coolant thermostat and disconnect
Unlock connector on hydraulic valve and disconnect
Unlock connector on the coolant pump and disconnect
Unlock connector on exhaust turbocharger and disconnect
Unlock connector on both camshaft adjustment solenoid valves and disconnect
Release earth cable on crankcase lower section Tightening torque 12 90 9AZ .
Release earth cable at rear of cylinder head Tightening torque, 12 90 10AZ.
Unlock connector on intake camshaft pulse sensor and disconnect
Unlock connector on exhaust camshaft pulse sensor and disconnect
Unlock connector on oil pressure switch and disconnect
Unlock connector on switching motor for eccentric shaft and disconnect

If necessary, loosen the wiring harness from existing clips and clamps.

Feed out wiring harness and remove.

Installation note:

Check the wiring harness installation arrangement.

Check that the plug connections are correctly fitted.

Check stored fault messages.

Delete the fault memory.