BMW - 525i - Wiring Diagram - 1988 - 1991

BMW - electrical systems - WIRING DIAGRAM Models 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 and Convertible versions of these models 5-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 cc Since it isn’t possible to include all wiring diagrams for every model year covered, the following diagrams are those that are typical and most commonly needed. Colour codes BK BL BR GE GN GR GY OR PK R RS RT SW TN V VI W WS Y Black Blue Brown Yellow Green Green or Grey Grey Orange Pink Red Pink Red Black Tan Violet Violet White White Yellow Diagrams index Typical - starting, charging,horn, hazard flasher end direction indicator Typical - headlights/foglights and interior lights Typical - check control, elettric mirrors, stop and parking light Typical - Motronic engine control system wiring diagram Typical - cruise control system wiring diagram Typical - wiring diagram for the central locking, burglar alarm, on-board computer, additional heater end digital clock Typical - headlighl washer syslem wiring diagram Typical - electric window system wiring diagram Typical - air conditioning system wiring diagram Typical - wiring diagram for heated seats Typical - wiring diagram for memory power seats Typical - wiring diagram for power seats without memory Typical - radio wiring diagram Typical - Jetronic system wiring diagram 2 3 4 5 8 10 13 15 17 19 21 24 26 28 2 3 4 5 6 Key to Motronic engine control system wiring diagram (picture 1/1 – 1/2) 18. Distributor 1. Electronic Control Unit (ECU) 19. Ignition coil 2. Speed control relay 20. Starter 3. Temperature switch 21. Altenator 4. Air conditioner 22. Position transmitter 5. Car wire harness connection 23. Plug dìsconnected for automatic 6. Throttle switch transmission 7. Airflow sensor 24. Coolant temperature sensor 8. Speed sensor 25. Fuel injector 9. Reference mark sensor 26. Solenoid 10. Relay 1 27. Electric power distributor 11. Relay 2 28. Oil pressure 12. Oil pressure switch 29. Temperature gauge 13. Temperature transmitter 30. Electric fuel pump 14. Diagnosis conneclion 31. Service indicator 15. Engine plug 32. Drive motor 16. Battery 33. Temperature switch 17. Spark plugs 7 Picture 2 8 Key to cruise control system wiring diagram (picture 2) 1. Plug connection - centre section to instrument cluster (26-pin) 2. Steering column switch 3. Instrument cluster 4. Plug connection range indicator 5. Range indicator D 6. Range indicator N 7. Range indicator R 8. Plug connoction speedometer outlet 9. Connection - instrument cluster (2-pin) 10. Plug connection - steering column switch 11. Plug connection - special equipment 12. Steering column switch 13. Plug connection rear section to centre section (29-pin) 14. Stoplight switch 15. Plug connection-drive motor 16. Connection - clutch swltch to bridge 17. Stoplight left 18. Stoplight right 19. Electronic control - cruise control 20. Drive motor- cruise control 21. Bridge (only for automalic transmission) 22. Clutch switch 9 Picture 3/1 10 Picture 3/2 11 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. 37. 38. 39. 40. 41. 42. 43. Key to wiring diagram for the central locking, burglar alarm, on-board computer, additional heater end digital clock (picture 3/1 – 3/2) 44. Plug for light diode Plug - rear section to centre section 45. Diode Connection for special equipmenl plug 46. Plug - burglar alarm wire to central Connaction for central loçk control unit lock connecting wire Central lock electronic control unit (A 47. Chime (left of steering column) pillar end plate) Plug - driver's door wire to rear section 48. Connection for chime 49. Plug - centre section to LE-Jetronic wire harness Plug - central lock connecting wire to 50. Ignition switch driver's door wire 50(13-pin) 51. Remote control switch for on-board Plug – central lock connecting wire to computer passenger's door wire 52. Plug on-board computer to outside Plug driver's door cenlral lock wire to temperature sensor wire swilch 53. Plug - outside temperature sensor wire Central lock switch/unblocking arrest to outside temperature sensor (driver's door,on lock) 54. Outside temperature sensor (lower front panel) Connection for centralloçk motor to 55. Plug - extra heater wire to automatic driver's door (6-pin) aerial Central lock motor - driver's door Plug-passenger's door wire to microswitch 56. Parked car heating electronic control unit (on parked car heater underneath Microswitch (passenger's door,on lock) righit seat) Central lock motor-passenger's door 57. Connection for electronic control unit Central lock motor-pàssenger's door Connection for central lock motor to boot 58. Relay for parked car heater (on heater) 59. Plug - on-board computer wire to extra lid(6-pin) Central lock motor - bool lid heater wire Connection for cenlral lock motor to fuel 60. Plug - centre section to instrument filler flap (6-pin) cluster Central lock motor-fuel filler flap 61. Connection for instrument cluster Connection for central lock motor to left 62. On-board computer electronic contol rear door(6-pin) unit (right of instrument cluster) Central lock molor - left rear door 63. Connection for on-board computer Connection for central lock motor to 64. Connection for instrument cluster II right door(6-pin) 65. Instrument cluster Plug – central lock connecting wire to 66. Plug- rear section to instrument right rear door (7-pin) cluster Plug – cantral lock connecting wire lo 67. Plug - digital clock wire to instrument left rear door 17-pin) cluster Central lock motor- right rear door 68. Plug-extra wire to heater wire Rear window heater switch 69. Plug-heater wire to fuel pump wire Burglar alarm electronic control unit 70. Connection for heater (left of steering column) 71. Ballast resistor in heater Connection for burglar alarm electronic 72. Thermoswitch (parked car heater) control unit I (26-pin) 73. Heater motor 74. Overheating switch (parked car heater) Connection for relay box (4-pin) 75. Heater plug for parked car heater Connection for burglar alarm electronic 76. Heater conlroi unii II (4-pin) 77. Fuel pump Plug 150 (in main wire harness) 78. Plug - on-board computer to remote Light diode for burglar alarm control Plug for boot light 79. Plug - speed dependent loudness control Boot lighl 80. Plug-wire for cruise control Door contact switch front left 81. Fuel level trensmitter Door contact switch tront right 82. Speed transmitter Door contact switch rear left 83. Plug - digital clock wire to digital Door contact switch rear right clock (4-pin) Boot lid contact 84. Plug digital clock wire to digital Bonnet contact clock (2-pin) Rear window heater 85. Digitai clock Plug - centre section to wire for on board computer/burgiar alarm Horn 12 Picture 4 13 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 lights Fuse - horns, wash/wipe control unit and headlight cleaners Motor - windscreen wipers Wiper switch Pump - headlight cleaning svstem Pump- intensive cleaning fluid Pump - windscreen washing system Plug - headlight cleaner wire to front section I (washer fluid pump) Plug - Headlight cleaner wire to front section II {plug for headlighl cleaners) Plug - centre section to front section (7-pin) Plug for wiper motor Plug-centre section to wiper switch Motor-windscreen wipers Motor - left headlight wiper Wash/wipe interval control unit 14 Picture 5 15 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 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 equipment plug Window switch rear left Window switch rear left Window switch rear right Plug for left rear door wire to window motor rear left Plug for right door wire to window motor rear right Wlndow motor rear left Window motor rear right Plug for window control and central lock wire to left rear door Plug lor window control and central lock wire to right rear door(7pin) Power safety switch Child safety switch Window motor front left Window motor front right Plug for driver's door wire to window motor front left Plug for passenger's door wire to window motor of passenger's door Relay Plug for window control and central lock wire to passenger's door (13-pin) Wlndow switch front left Window switch rear right Window switch front right 16 Picture 6 17 Key to air conditioning system wiring diagram (picture 6) 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. Light for heater controls Light diode III Light diode II Light diode I Switch - heater/evaporator blower Plug heater control wire harness to centre wire harness (13-pin) Plug - front wire harness section to heater controls Fuse - heater blower Fuse - extra fan stage II Fuse - ind.lamp, reversing lights, tachometer and mirrors (power distributor) Temperature switch 91°C - stage I Temperature switch 99°C - stage II Switch-airconditioner Water valve Evaporator temperature regulator Air conditioner control unit (heater controls) Plug - extra fan motor (on extra fan motor I) Relay - extra fan stage II (on power distributorI Relay - extra fan stage I (on power distributori Switch - high pressure pressostat (drier) Switch temperature 110°C(only for 524td) Motor-heater blower Motor - evaporator blower Plug - high pressure pressostat to electromagnetic coupling Evaporator temperature sensor (in evaporator) Heater temperature sensor (in heater) Inside temperature sensor(lower trim panel left) Eiectromagnetic coupling far compressor Motor - extra fan 18 Picture 7 19 Key to wiring diagram for heated seats (picture 7) 1. 2. 3. 4. Heating - passenger's seat Seat heating connection – pessenge’s side Seat heating switch - passenger's side Plug far heated seat wire (driver's side) to special equipment plug (58K) 5. Plug for heated seat wire (driver’s side) to passenger’s side 6. Plug for heated seat wire (driver’s side) to special equipment plug (15E and 30SA4) 7. Seat heating relay 8. Seat heating switch – driver’s side 9. Heating- driver’s side 10. Seat heating connection – driver’s side 20 Picture 8/1 21 Picture 8/2 22 Key to wiring diagram for memory power seats (picture 8/1 8/2) 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. Plug connection far special equipment plug Plug connection of wire for passenger's seat Plug connection of wire for seat control with memory Connection of wire for seat control with memory Seat control switch Backrest Slide Headrest Height front Height rear Plug connection for seat backrast/slide control Plug connection for seat headrest control Plug connection for seat height control Electronic control unit (undermeath seat) Plug connection of wire for seat control with memory Plug connection of wire for seat with memory Plug connection for seat control drive Plug connection for memory switch Plug connection for slide potentiometer Plug connection for front height potentiometer Plug connection for rear height potentiameter Plug cannection for headrest motor Plug connection for backrest potentiometer Plug connection for backrest motor Memory switch Motor-seat backrest control Motor headrest control Motor-height control rear Motor-height control front Motor-slide 23 Picture 9 24 Key to wiring diagram for power seats without memory (picture 9) 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. Plug connection far special equipment plug Backrest Seat foward/backward Headrest Seat up/down front Seat up/down read Plug switch for backrast/seat control Plug switch for headrest control Plug switch for front/rear seat up/down control Switch for power seats Plug - power seal wire to power seat electronic control unit Electronic control unit for power seats (below seats) Plug - power seat drive to power seat electronic control unit Plug - power backrest and headrest wire to power seat electronic control unit Plug - power backrest and headrest wire to backrest motor Plug - power backrest and headrest wire to the headrest motor Plug - power seat wire on driver's side to wire on passenger's side Motor-seat up/down front Motor-seat up/down rear Motor - seat forward/backward Motor - backrest Motor - headrest 25 Picture 10 26 Key to radio wiring diagram (picture 10) 1 Speaker door right 2 Speaker front right 3 Speaker rear right 4 Special equipment plug RA12 5 Connection for power windows 6 Amplifier 7 Speaker front left 8 Speaker door left 9 Connection for power supply lead IO Connection for power aerial 11 Radio 12 Speaker balance control 13 Speaker rear left 27 28