HƯỚNG DẪN ĐỌC SƠ ĐỒ MẠCH ĐIÊN XE BMW

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