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 MANUALSBMW2021740IREPAIR AND DIAGNOSIS (SINGLE PAGE)BODY & FRAMEDOOR LOCKSGENERAL ELECTRICAL SYSTEM -- REPAIR (G12) (2 OF 2)
2021 BMW 740i
General Electrical System -- Repair (G12) (2 Of 2)
2021 BMW 740iSECTION General Electrical System -- Repair (G12) (2 Of 2)
- 61 31 Switch, Sensor
- 61 31 008 Removing and installing steering column switch cluster
- 61 31 011 Removing and installing/replacing coil spring cassette
- 61 31 021 Remove and install/replace ring antenna
- 61 31 023 Remove and install/replace START-STOPPING button
- 61 31 035 Removing and installing/replacing steering column adjustment switch
- 61 31 037 Removing and installing/replacing light control unit
- 61 31 043 Removing and installing the FZD
- 61 31 062 Removing and installing/replacing button for heated steering wheel
- 61 31 066 Removing and installing/replacing hotel position switch
- 61 31 080 Removing/installing/replacing hazard warning switches
- 61 31 082 Removing and installing/replacing switch for central locking system
- 61 31 083 Removing and installing/replacing switch for tailgate release
- 61 31 113 Removing and installing/replacing both shift paddles for automatic transmission
- 61 31 116 Replace power window switch for side window operation
- 61 31 117 Removing and installing/replacing power window switch on driver's side
- 61 31 122 Removing and installing/replacing tow hitch switch
- 61 31 134 Removing and installing/replacing USB audio interface connecting socket
- Removing the connecting socket of the USB audio interface in the front storage compartment
- Install the connecting socket of the USB audio interface in the storage compartment
- Removing the socket of the USB audio interface (storage compartment in the center console)
- Install the connecting socket of the USB audio interface (storage compartment in center console)
- 61 31 172 Remove and install the switch for the electromechanical parking brake
- 61 31 195 Removing and installing front controller
- 61 31 197 Removing and installing control unit for center console
- 61 31 203 Replace the operating unit for the seat adjustment (in the rear of the multifunction armrest)
- 61 31 204 Replacing operating unit for seat adjustment
- 61 31 221 Removing and installing/replacing both multifunction steering wheel switches
- 61 31 231 Removing and installing/replacing steering wheel electronics control unit
- 61 31 232 Removing and installing/replacing the control unit for contact detection
- 61 31 233 Removing and installing/replacing the vibration actuator for lane departure warning
- 61 31 310 Replacing brake light switch
- 61 31 321 Removing and installing radio and A/C control panel
- 61 31 336 Removing and installing the gear selector switch cover
- 61 31 341 Replace the handle and trim for the gear selector switch
- 61 31 342 Remove and install gear selector switch
- 61 31 362 Removing and installing remote control receiver
- 61 31 544 Replace roof function center (FZD) (After vehicle diagnosis)
- 61 31 584 Removing and installing/replacing the switch for the power tailgate
- 61 31 676 Replacing control unit, additional seat function, right or left front (after vehicle diagnosis)
- 61 31 677 Replacing additional seat function control unit, rear left or right (after vehicle diagnosis)
- 61 31 822 Replacing the radio and air conditioning control panel (after vehicle diagnosis)
- 61 31 843 Replacing gear selector switch (After vehicle diagnosis)
- 61 31 898 Replacing the relay for the air supply system (after vehicle diagnosis)
- 61 33 Horn
- 61 34 Cigarette Lighter, Power Sockets
- 61 35 Control Units, Modules
- Notes on ESD protection (Electro Static Discharge)
- Overview, rain sensor (additional work when replacing the windshield/sensor replacement)
- Overview of additional work for the removal and installation or replacement of electronic components in the body area/windshield
- 61 35 001 Removing and installing trailer module
- 61 35 018 Removing and installing the control electronics for Near Field Communication
- 61 35 021 Removing and installing/replacing the storage tray (NFC) near field communication
- 61 35 080 Removing and installing control unit/module for left or right seat adjustment
- 61 35 179 Remove and install rain-light-solar-condensation sensor
- 61 35 193 Removing and installing the Touchbox (TBX) control unit
- 61 35 196 Removing and installing the control unit for the power tailgate
- 61 35 240 Remove and install control unit for contactless trunk opening
- 61 35 243 Remove and install the top sensor line for contactless trunk opening
- 61 35 245 Remove and install the bottom sensor line for contactless trunk opening
- 61 35 278 Removing/installing Body Domain Controller (BDC) control unit
- 61 35 502 Replacing towing module (After vehicle diagnosis)
- 61 35 519 Replacing control electronics for Near Field Communication (after vehicle diagnosis)
- 61 35 579 Replacing the control unit/module for the left seat adjustment (after vehicle diagnosis)
- 61 35 582 Replacing the control unit/module for seat adjustment, left or right (After vehicle diagnosis)
- 61 35 586 Replacing the control unit/module for seat adjustment, left or right (Rear comfort seats) (after vehicle diagnosis)
- 61 35 596 Replacing control unit module for seat heating (after vehicle diagnosis) (rear seat) (left or right)
- 61 35 598 Replace the control unit/module for the left or right seat heating (rear comfort seat) (left or right) (after vehicle diagnosis)
- 61 35 681 Replacing control unit for rear passenger compartment air conditioning (after vehicle diagnosis)
- 61 35 688 Replacing rain-light-solar-condensation sensor (after vehicle diagnosis)
- 61 35 694 Replacing the Touchbox (TBX) control unit (after vehicle diagnosis)
- 61 35 697 Replacing control unit for automatic tailgate operation (After vehicle diagnosis)
- 61 35 779 Replace Body Domain Controller control unit (BDC) (After vehicle diagnosis)
- 61 35 953 Removing and installing/replacing interior antenna for Comfort Access (front center console) (after vehicle diagnosis)
- 61 35 954 Removing and installing/replacing interior antenna for Comfort Access (Center console at rear) (after vehicle diagnosis)
- 61 35 970 Removing and installing/replacing luggage compartment antenna for Comfort Access (after vehicle diagnosis)
- 61 35 980 Removing and installing/replacing antenna for Comfort Access on left or right (after vehicle diagnosis)
- 61 42 Voltage Transformer
- 61 42 010 Removing and installing the battery charger module (all 7' series models 2016-2022)
- 61 42 050 Remove and install voltage transformer (all 7' series models 2016-2022)
- 61 42 100 Remove and install 48V Power Control Unit (PCU 48) (740i 2016-2022, 740i xDrive 2017-2022, 745e xDrive PHEV 2020-2022)
- 61 42 551 Replacing voltage transformer (after vehicle diagnosis) (all 7' series models 2016-2022)
- 61 42 601 Replacing Power Control Unit 48 V (PCU 48) (740i 2016-2022, 740i xDrive 2017-2022, 745e xDrive PHEV 2020-2022)
- 61 42 100 Remove and install 48V Power Control Unit (PCU 48) (740e xDrive PHEV 2017-2019)
- 61 42 601 Replacing Power Control Unit 48 V (PCU 48) (740e xDrive PHEV 2017-2019)
- 61 44 001 Remove and install convenience charging electronics (740e xDrive PHEV 2017-2019, 745e xDrive PHEV 2020-2022)
- 61 44 502 Replacing the KLE (after vehicle diagnosis) (740e xDrive PHEV 2017-2019, 745e xDrive PHEV 2020-2022)
- 61 61 Windshield Wiper
- 61 61 021 Replacing the wiper blade on the left or right
- 61 61 041 Replacing both wiper blades
- 61 61 051 Replacing left or right wiper blade and wiper arm
- 61 61 071 Replacing both wiper blades and wiper arms
- 61 61 081 Replacing the left or right wiper arm
- 61 61 100 Remove and install/replace both windshield wiper arms
- 61 61 270 Completely removing and installing the console for the windshield wiper system including engine
- 61 67 Headlight Washer System
- 61 71 Windshield Washer System
- 61 71 004 Adjusting spray nozzles for washer system
- 61 71 051 Replace wind. washer system nozzle chain
- 61 71 063 Removing and installing the washer fluid reservoir for the washer system
- 61 71 065 Replace the washer fluid reservoir for the washer system
- 61 71 100 Removing and installing/replacing window washer pump
RENDER: 1.0x
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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.