BMW - Electrical Systems - WIRING DIAGRAM

BMW - electrical systems - WIRING DIAGRAMModels covered : 3-Series (E30) 316 (83 to 88), 316i (88 to 91), 318i (83 to 91), 320i (87 to 91), 325i (87 to 91). Also Touring andConvertible versions of these models5-Series (E28) 518 (81 to 85), 518i (85 to 88), 525i (81 to 88), 528i (81 to 88), 535i (85 to 88), M535i (85 to 88)5-Series (E34) 518i (90 to 91), 520i (88 to 91), 525i (88 to 91), 530i (88 to 91), 535i (88 to 91)Engines covered 1596 cc, 1766 cc, 1795 cc, 1990 cc, 2494 cc, 2788 cc, 2986 cc & 3430 ccSince it isn’t possible to include all wiring diagrams for every model year covered, the followingdiagrams are those that are typical and most commonly needed.Colour ownYellowGreenGreen or iteWhiteYellowDiagrams indexTypical - starting, charging,horn, hazard flasher end direction indicatorTypical - headlights/foglights and interior lightsTypical - check control, elettric mirrors, stop and parking lightTypical - Motronic engine control system wiring diagramTypical - cruise control system wiring diagramTypical - wiring diagram for the central locking, burglar alarm, on-board computer,additional heater end digital clockTypical - headlighl washer syslem wiring diagramTypical - electric window system wiring diagramTypical - air conditioning system wiring diagramTypical - wiring diagram for heated seatsTypical - wiring diagram for memory power seatsTypical - wiring diagram for power seats without memoryTypical - radio wiring diagramTypical - Jetronic system wiring diagram23458101315171921242628

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Key to Motronic engine control system wiring diagram (picture 1/1 – 1/2)18. Distributor1. Electronic Control Unit (ECU)19. Ignition coil2. Speed control relay20. Starter3. Temperature switch21. Altenator4. Air conditioner22. Position transmitter5. Car wire harness connection23. Plug dìsconnected for automatic6. Throttle switchtransmission7. Airflow sensor24. Coolant temperature sensor8. Speed sensor25. Fuel injector9. Reference mark sensor26. Solenoid10. Relay 127. Electric power distributor11. Relay 228. Oil pressure12. Oil pressure switch29. Temperature gauge13. Temperature transmitter30. Electric fuel pump14. Diagnosis conneclion31. Service indicator15. Engine plug32. Drive motor16. Battery33. Temperature switch17. Spark plugs7

Picture 28

Key to cruise control system wiring diagram (picture 2)1.Plug connection - centresection to instrumentcluster (26-pin)2. Steering column switch3. Instrument cluster4. Plug connection rangeindicator5. Range indicator D6. Range indicator N7. Range indicator R8. Plug connoction speedometer outlet9. Connection - instrumentcluster (2-pin)10. Plug connection - steeringcolumn switch11. Plug connection - specialequipment12. Steering column switch13. Plug connection rear sectionto centre section (29-pin)14. Stoplight switch15. Plug connection-drive motor16. Connection - clutch swltchto bridge17. Stoplight left18. Stoplight right19. Electronic control - cruisecontrol20. Drive motor- cruise control21. Bridge (only for automalictransmission)22. Clutch switch9

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Picture 3/211

7.38.39.40.41.42.43.Key to wiring diagram for the central locking, burglar alarm, on-boardcomputer, additional heater end digital clock (picture 3/1 – 3/2)44. Plug for light diodePlug - rear section to centre section45. DiodeConnection for special equipmenl plug46. Plug - burglar alarm wire to centralConnaction for central loçk control unitlock connecting wireCentral lock electronic control unit (A47. Chime (left of steering column)pillar end plate)Plug - driver's door wire to rear section 48. Connection for chime49. Plug - centre section to LE-Jetronicwire harnessPlug - central lock connecting wire to50. Ignition switchdriver's door wire 50(13-pin)51. Remote control switch for on-boardPlug – central lock connecting wire tocomputerpassenger's door wire52. Plug on-board computer to outsidePlug driver's door cenlral lock wire totemperature sensor wireswilch53. Plug - outside temperature sensor wireCentral lock switch/unblocking arrestto outside temperature sensor(driver's door,on lock)54. Outside temperature sensor (lower frontpanel)Connection for centralloçk motor to55. Plug - extra heater wire to automaticdriver's door (6-pin)aerialCentral lock motor - driver's doorPlug-passenger's door wire to microswitch 56. Parked car heating electronic controlunit (on parked car heater underneathMicroswitch (passenger's door,on lock)righit seat)Central lock motor-passenger's door57. Connection for electronic control unitCentral lock motor-pàssenger's doorConnection for central lock motor to boot 58. Relay for parked car heater (on heater)59. Plug - on-board computer wire to extralid(6-pin)Central lock motor - bool lidheater wireConnection for cenlral lock motor to fuel 60. Plug - centre section to instrumentfiller flap (6-pin)clusterCentral lock motor-fuel filler flap61. Connection for instrument clusterConnection for central lock motor to left 62. On-board computer electronic contolrear door(6-pin)unit (right of instrument cluster)Central lock molor - left rear door63. Connection for on-board computerConnection for central lock motor to64. Connection for instrument cluster IIright door(6-pin)65. Instrument clusterPlug – central lock connecting wire to66. Plug- rear section to instrumentright rear door (7-pin)clusterPlug – cantral lock connecting wire lo67. Plug - digital clock wire to instrumentleft rear door 17-pin)clusterCentral lock motor- right rear door68. Plug-extra wire to heater wireRear window heater switch69. Plug-heater wire to fuel pump wireBurglar alarm electronic control unit70. Connection for heater(left of steering column)71. Ballast resistor in heaterConnection for burglar alarm electronic72. Thermoswitch (parked car heater)control unit I (26-pin)73. Heater motor74. Overheating switch (parked car heater)Connection for relay box (4-pin)75. Heater plug for parked car heaterConnection for burglar alarm electronic76. Heaterconlroi unii II (4-pin)77. Fuel pumpPlug 150 (in main wire harness)78. Plug - on-board computer to remoteLight diode for burglar alarmcontrolPlug for boot light79. Plug - speed dependent loudness controlBoot lighl80. Plug-wire for cruise controlDoor contact switch front left81. Fuel level trensmitterDoor contact switch tront right82. Speed transmitterDoor contact switch rear left83. Plug - digital clock wire to digitalDoor contact switch rear rightclock (4-pin)Boot lid contact84. Plug digital clock wire to digitalBonnet contactclock (2-pin)Rear window heater85. Digitai clockPlug - centre section to wire for onboard computer/burgiar alarmHorn12

Picture 413

1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.Key to headlighl washer syslem wiring diagram (picture 4)Control unit for headlight cleaners (on fluid reservoir)Fuse- overnight, tail and parking lightsFuse - horns, wash/wipe control unit and headlight cleanersMotor - windscreen wipersWiper switchPump - headlight cleaning svstemPump- intensive cleaning fluidPump - windscreen washing systemPlug - headlight cleaner wire to front section I (washer fluid pump)Plug - Headlight cleaner wire to front section II {plug forheadlighl cleaners)Plug - centre section to front section (7-pin)Plug for wiper motorPlug-centre section to wiper switchMotor-windscreen wipersMotor - left headlight wiperWash/wipe interval control unit14

Picture 515

.21.22.23.24.Key to electric window system wiring diagram (picture 5)Plug for rear section to driver's door (5-pin)Plug for rear section to center section (27 –pin)Plug for window control and central lock wire to driver's door(13pin)Plug for window control and central lock wire to special equipmentplugWindow switch rear leftWindow switch rear leftWindow switch rear rightPlug for left rear door wire to window motor rear leftPlug for right door wire to window motor rear rightWlndow motor rear leftWindow motor rear rightPlug for window control and central lock wire to left rear doorPlug lor window control and central lock wire to right rear door(7pin)Power safety switchChild safety switchWindow motor front leftWindow motor front rightPlug for driver's door wire to window motor front leftPlug for passenger's door wire to window motor of passenger's doorRelayPlug for window control and central lock wire to passenger's door(13-pin)Wlndow switch front leftWindow switch rear rightWindow switch front right16

Picture 617

Key to air conditioning system wiring diagram (picture 20.21.22.23.24.25.26.27.28.29.Light for heater controlsLight diode IIILight diode IILight diode ISwitch - heater/evaporator blowerPlug heater control wire harness to centre wire harness (13-pin)Plug - front wire harness section to heater controlsFuse - heater blowerFuse - extra fan stage IIFuse - ind.lamp, reversing lights, tachometer and mirrors (powerdistributor)Temperature switch 91 C - stage ITemperature switch 99 C - stage IISwitch-airconditionerWater valveEvaporator temperature regulatorAir conditioner control unit (heater controls)Plug - extra fan motor (on extra fan motor I)Relay - extra fan stage II (on power distributorIRelay - extra fan stage I (on power distributoriSwitch - high pressure pressostat (drier)Switch temperature 110 C(only for 524td)Motor-heater blowerMotor - evaporator blowerPlug - high pressure pressostat to electromagnetic couplingEvaporator temperature sensor (in evaporator)Heater temperature sensor (in heater)Inside temperature sensor(lower trim panel left)Eiectromagnetic coupling far compressorMotor - extra fan18

Picture 719

Key to wiring diagram for heated seats (picture 7)1.2.3.4.Heating - passenger's seatSeat heating connection – pessenge’s sideSeat heating switch - passenger's sidePlug far heated seat wire (driver's side) to special equipment plug(58K)5. Plug for heated seat wire (driver’s side) to passenger’s side6. Plug for heated seat wire (driver’s side) to special equipment plug(15E and 30SA4)7. Seat heating relay8. Seat heating switch – driver’s side9. Heating- driver’s side10. Seat heating connection – driver’s side20

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Picture 8/222

Key to wiring diagram for memory power seats (picture 8/1 9.20.21.22.23.24.25.26.27.28.29.30.Plug connection far special equipment plugPlug connection of wire for passenger's seatPlug connection of wire for seat control with memoryConnection of wire for seat control with memorySeat control switchBackrestSlideHeadrestHeight frontHeight rearPlug connection for seat backrast/slide controlPlug connection for seat headrest controlPlug connection for seat height controlElectronic control unit (undermeath seat)Plug connection of wire for seat control with memoryPlug connection of wire for seat with memoryPlug connection for seat control drivePlug connection for memory switchPlug connection for slide potentiometerPlug connection for front height potentiometerPlug connection for rear height potentiameterPlug cannection for headrest motorPlug connection for backrest potentiometerPlug connection for backrest motorMemory switchMotor-seat backrest controlMotor headrest controlMotor-height control rearMotor-height control frontMotor-slide23

Picture 924

Key to wiring diagram for power seats without memory (picture 20.21.22.Plug connection far special equipment plugBackrestSeat foward/backwardHeadrestSeat up/down frontSeat up/down readPlug switch for backrast/seat controlPlug switch for headrest controlPlug switch for front/rear seat up/down controlSwitch for power seatsPlug - power seal wire to power seat electronic control unitElectronic control unit for power seats (below seats)Plug - power seat drive to power seat electronic control unitPlug - power backrest and headrest wire to power seat electroniccontrol unitPlug - power backrest and headrest wire to backrest motorPlug - power backrest and headrest wire to the headrest motorPlug - power seat wire on driver's side to wire on passenger's sideMotor-seat up/down frontMotor-seat up/down rearMotor - seat forward/backwardMotor - backrestMotor - headrest25

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