Removing the engine wiring harness for sensor system 1

WARNING: This page is about a different car, the 2025 BMW M4, 2024 BMW M4, 2023 BMW M4, 2022 BMW M4, and 2021 BMW M4. However, it is still accessible from the selected car via links, so may be relevant.

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 steering column switch cluster (SZL) .
The steering column switch cluster (SZL) or the coil spring cassette can be damaged by twisting the steering wheel if the lower steering shaft (or the universal joint) is separated from the steering gear or the steering column .

After separating the lower steering shaft (or the universal joint) from the steering gear or from the steering column, secure the steering wheel against twisting.

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.

NOTE: TECHNICAL INFORMATION
When the engine is stopped after the completion of trip, it may be necessary to run the electric fan. In rare cases, operation of the electric fan can last up to 11 min. This protects the components. In this case, replacing the electric fan will not remedy the problem!

Preliminary work

Refer to NOTE THE INFORMATION ON THE CARBON CERAMIC BRAKE .
Refer to BRINGING FRONT COMPARTMENT LID IN THE SERVICE POSITION .
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 THE SEAL FOR THE HOOD REAR .
Refer to DISCONNECTING ALL BATTERY GROUND LEADS .
Refer to REMOVING SUSPENSION STRUT BRACE .
Refer to REMOVING THE ACOUSTIC COVER .
Refer to REMOVING THE FRONT-END STRUT .
Refer to REMOVING THE LEFT INTAKE FILTER HOUSING (FRONT-END STRUT REMOVED) .
Refer to REMOVING THE CLEAN AIR PIPE FOR CYLINDERS 1 TO 3 .
Refer to REMOVING THE COVER FOR THE DME CONTROL UNIT .
Refer to REMOVING THE DME CONTROL UNIT .
Refer to REMOVING THE INTEGRATED SUPPLY MODULE (PDM) PARTIALLY .
Refer to REMOVING THE CONTROL UNIT HOLDER .
Refer to RELEASING THE TRANSMISSION OIL LINES ON THE FRONT SUBFRAME .
Refer to REMOVING LEFT AND RIGHT WIPER ARM .
Refer to REMOVING WINDSHIELD PANEL COVER .
Refer to REMOVING TRAILING LINK AT SPRING BOLT .
Refer to REMOVING THE CENTER COWL UPPER PART .
Refer to REMOVING THE SIDE HOOD SEAL .
Refer to REMOVING THE COVER IN THE ENGINE COMPARTMENT TOP RIGHT REAR .
Refer to REMOVING THE COVER IN THE ENGINE COMPARTMENT AT THE TOP REAR .
Refer to REMOVING THE FILLER CHANNEL OF THE WASHER SYSTEM .
Refer to RELEASING THE WIRING HARNESS SECTION ON THE LEFT SHOCK TOWER .
Refer to RELEASING THE WIRING HARNESS SECTION AT THE RIGHT SHOCK TOWER .
Refer to REMOVING ALL IGNITION COILS .
Refer to REMOVING FUEL DELIVERY LINE .
Refer to REMOVING SEAL FOR FRONT HOOD .
Refer to REMOVING THE COVER FOR THE CENTER ENGINE COMPARTMENT .
Refer to REMOVING UPPER CROSS CONNECTION .
Refer to REMOVING THE REAR TOP CROSS CONNECTION .
Refer to REMOVING THE RIGHT INTAKE FILTER HOUSING (FRONT-END STRUT REMOVED) .
Refer to REMOVING THE FRONT LEFT AND RIGHT WHEELS .
Refer to RELEASING THE LEFT AND RIGHT OUTPUT SHAFTS FROM THE WHEEL BEARINGS .
Refer to RELEASING THE FRONT LEFT AND RIGHT BRAKE CALIPERS .
Refer to REMOVING THE COVER OF THE STEERING ASSEMBLY ON THE LEFT AND RIGHT .
Refer to REMOVING THE FRONT SECTION OF THE FRONT WHEEL ARCH COVER ON THE LEFT AND RIGHT .
Refer to REMOVING THE LEFT FRONT AND RIGHT FRONT BRAKE VENTILATION DUCT .
Refer to REMOVING THE REAR SECTION OF THE WHEEL ARCH COVER ON THE FRONT LEFT AND RIGHT .
Refer to REMOVING THE FRONT SPOILER .
Refer to REMOVING THE FRONT UNDERBODY PROTECTION .
Refer to REMOVING THE BOTTOM FRONT LEFT AND RIGHT COVER .
Refer to PARTIALLY RELEASING THE ENGINE OIL COOLER .
Refer to REMOVING THE LEFT AND RIGHT FRONT UNDERSHIELD .
Refer to REMOVING THRUST FIELD .
Refer to DRAINING THE COOLANT FOR THE HIGH-TEMPERATURE COOLANT CIRCUIT .
Refer to DRAINING THE COOLANT FROM THE LOW-TEMPERATURE COOLING SYSTEM .
Refer to REMOVING THE FAN COWL .
Refer to REMOVING THE COOLANT EXPANSION TANK FOR THE LOW-TEMPERATURE COOLANT CIRCUIT .
Refer to REMOVING CHARGE AIR COOLER .
Refer to RELEASING THE WISHBONE, TENSION STRUT AND TIE ROD END ON THE LEFT AND RIGHT FROM THE SWIVEL BEARING .
Refer to REMOVING THE LEFT AND RIGHT OUTPUT SHAFTS .
Refer to RELEASING FRONT PROP SHAFT FROM FRONT AXLE TRANSMISSION .
Refer to PUTTING THE ENGINE INTO THE INSTALLATION POSITION .
Refer to RELEASING THE STEERING SHAFT AT THE BOTTOM ON THE DOUBLE PIVOT .
Refer to DETACHING THE WIRING HARNESS OF THE EPS FROM THE FRONT SUBFRAME .
Refer to DETACHING THE LINE CONNECTION OF THE RIDE HEIGHT SENSOR .
Refer to LOOSENING THE ANTI-ROLL BAR LINK ON THE LEFT AND RIGHT FROM THE ANTI-ROLL BAR .
Refer to RELEASING THE COOLANT LINES FROM THE FRONT SUBFRAME .
Refer to RELEASING THE REINFORCEMENT STRUT FROM THE FRONT SUBFRAME .
Refer to PREPARING THE SPECIAL TOOL .
Refer to REMOVING FRONT AXLE COMPLETELY .
Refer to REMOVING FRONT AXLE DIFFERENTIAL .

Engine wiring harness for sensor system 1

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: RISK OF DAMAGE
Electrostatic discharge .
Damage to or destruction of electrical components .

Leave the electrical components in their original packaging until they are being installed. Only use the original packaging for returning the product. Always package removed components straight away.
Read and comply with user information on using the associated special tool 12 7 060.
Only tap the housings of electrical components. Do not tap pins or multi-pin connectors directly.
Wear electrically conductive clothing and antistatic shoes (with ESD symbol).
For additional information see: 61 35... NOTES ON ESD (ELECTROSTATIC DISCHARGE) PROTECTION .

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.

Unlock plug connections (1) and disconnect.
Loosen the clamp (arrow).
Feed out the engine wiring harness (2) for the sensor system 1 and set it aside.

Courtesy of BMW OF NORTH AMERICA, INC.
Unlock and disconnect plug connections (1) .

Courtesy of BMW OF NORTH AMERICA, INC.
Unlock and disconnect plug connections (1) .
Release the clamps (arrows).

Courtesy of BMW OF NORTH AMERICA, INC.
Unlock plug connections (1) and disconnect.
Loosen the clamp (arrow).

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

Courtesy of BMW OF NORTH AMERICA, INC.
Unlock and disconnect plug connections (1) .
Release the clamps (arrows).

Courtesy of BMW OF NORTH AMERICA, INC.
Unlock plug connection (1) and disconnect.
Release the clamps (arrows).
Feed out the engine wiring harness (2) for the sensor system 1 and set it aside.

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

Courtesy of BMW OF NORTH AMERICA, INC.