Removing the engine wiring harness for sensor system 1

WARNING: Working on 12 V electrical system .
Risk of short circuits! Risk of fire!

Make sure that there is no charger connected to the jump start terminal in the engine compartment.
Detach battery ground lead from battery.
For auxiliary batteries: Detach battery minus cables from all auxiliary batteries.

NOTE: RISK OF DAMAGE
Damage to battery terminal, the safety battery terminal or the intelligent battery sensor (IBS) .
Damaged battery terminals can lead to malfunctions or vehicle electrical system faults .

Detach battery terminal from battery pole by carefully shifting to and fro. Do not pry off using a tool.

Preliminary work

Refer to DEACTIVATING ELECTRICAL SYSTEM .
Refer to REMOVING THE SEAL FOR THE HOOD REAR .
Refer to REMOVING THE COVER OF THE ENGINE COMPARTMENT AT THE REAR LEFT .
Refer to REMOVING THE COVER OF THE REAR RIGHT ENGINE COMPARTMENT .
Refer to REMOVING LEFT AND RIGHT WIPER ARM .
Refer to REMOVING WINDSHIELD PANEL COVER .
Refer to REMOVING THE CENTER COWL UPPER PART .
Refer to REMOVING THE ACOUSTIC COVER .
Refer to REMOVING ACOUSTIC COVER AT REAR .
Refer to REMOVING THE DME CONTROL UNIT .
Refer to REMOVING THE INTEGRATED POWER SUPPLY MODULE (PDM) .
Refer to REMOVING THE CONTROL UNIT HOLDER .
Refer to REMOVING TANK VENT VALVE .
Refer to REMOVING THE FRONT UNDERBODY PROTECTION .
Refer to REMOVING THE UNDERBODY PROTECTION OF THE STEERING GEAR .
Refer to IF INSTALLED: REMOVING THE UNDERBODY PROTECTION OF THE STEERING SYSTEM .
Refer to REMOVING THE CENTER UNDERBODY PROTECTION .
Refer to REMOVING REAR UNDERBODY PROTECTION .
Refer to DRAINING THE COOLANT FROM THE LOW-TEMPERATURE COOLING SYSTEM .
Refer to CONNECTING THE COOLANT LINES FOR THE LOW-TEMPERATURE COOLANT CIRCUIT .
Refer to REMOVING THE INTAKE PLENUM .

Engine wiring harness for sensor system 1

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: RISK OF DAMAGE
Damage to wires when disconnecting connectors and plug connections .
Sheared wires can cause a short circuit .

Do not pull on wires when disconnecting connectors and plug connections.

Feed out the wiring harness section (1) for the sensor system 1 from the holder (2) and set it aside.

Courtesy of BMW OF NORTH AMERICA, INC.
Unlock and disconnect plug connections (1) .
Unlock and disconnect plug connections (2) .
Unlock plug connection (3) and disconnect.
Unlock plug connection (4) and disconnect.
Loosen the clamp (arrow).
Feed out the wiring harness section (5) for the sensor system 1 and set it aside.

Courtesy of BMW OF NORTH AMERICA, INC.
Loosen screws (1) .
Unlock the lock (arrow).
Remove the wiring harness section (2) and put to one side.

Courtesy of BMW OF NORTH AMERICA, INC.
Loosen screws (1) .

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Unlock plug connection (1) and disconnect.
Loosen nut (2) .
Guide the positive battery cable (3) out of the clamp (4) and lay to one side.

Courtesy of BMW OF NORTH AMERICA, INC.
Loosen the expanding rivet (1) .
Undo fir tree clip (2) .
Release the clamps (arrows).

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Loosen expanding rivet (1) .
Lower the acoustic cover of the oil pan.

Courtesy of BMW OF NORTH AMERICA, INC.
Loosen expanding rivet (1) .
Loosen the clamp (arrow).
Lower the acoustic cover (2) .

Courtesy of BMW OF NORTH AMERICA, INC.
Unlock plug connection (1) and disconnect.
Unlock and disconnect plug connections (2) .
Release the wiring harness section (3) for the sensor system 1 from the clamp (arrow) and set it aside.

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Remove the wiring harness section (1) and put to one side.
Loosen screw (2) .
Unlock plug connection (3) and disconnect.

Courtesy of BMW OF NORTH AMERICA, INC.
Feed out and remove the wiring harness section (1) for the sensor system 1.

Courtesy of BMW OF NORTH AMERICA, INC.