1988 BMW 635CSi/M6 Electrical Troubleshooting Shop Manual

1988 BMW 635CSi / M6 Electrical Troubleshooting Manual, 88 BMW, BMW Shop manual, Repair manual, electrical System only, Repair, Service, Troubleshoot, Schematic, Drawings, Download, Online, Now, Download Schematic for Wiring, Repair, Shorts, Do it yourself, 1988 BMW, 635, SI, M6, 1988, BMW 635CSi/M6
Electrical
Troubleshooting
Manual
Index – Alphabetical Listing of Electrical Circuits
Active Check Control. 6216- 0 0670-16 – Rear Marker 6320- 0
Antilock Braking System (ABSl 3450- 0 0670-17 RH Visor 6300- 0
AIC Auxiliary Evaporator. 6414- 0 – G201 0670-17 – Side Marker, M6 6314- 1
AIC Blower Control 6413- 0 – G302 . 0670-18 – Stop 6325- 0
AIC Compressor Control. 6411- 0 Heating and Air Conditioning 6440- 0 Tail. 6314- 0
AIC Panel Lights 6400- 0 Heated Door Lock. 6100- 0 – Transmission Range. 6300- 1
AIC Temperature Control, L6 . 6411- 0 Heated Seats. 5200- 6 – Trunk 6320- 0
AIC Temperature Control, M6 6411- 1 Horn. 6100- 0 – Underhood. 6314- 0
Auto-Charging Flashlight 6100- 2 Ignition Key Warning. 6131- 0 Light Switch Details. 6300- 0
Auxiliary Fan. 6454- 0 Indicators Memory Seat 5200- 0
Body Electrical 6100- 0 – Active Check Control Alarm. 6210- 2 On-Board Computer
Brake Lining Warning 3435- 0 ” Anti-Lock” 3450- 1 635 CSi 6581- 0
Central Locking. 5126- 0 – “Brake Lights” Fault. 3435- 0 6581- 1
Charging System, 3. 5i Engine 1230- 0 – “Brake” Warning. 6210- 3 M6 6581- 0
Charging System, S38 Engine 1230- 1 – Charge,3.5i 6210- 0 6581- 2
Cigar Lighter. 6100- 2 – Charge, S38 6210- 1 Power Antenna. 6500- 0
Component Location Chart 9000- 0 – “Coolant” Level Fault .. 6216- 3 Power Distribution. 0670- 0
Component Location Views. 7000- 0 – “Engine Oil” Fault 6216- 3 Power Distribution Box. 0670- 0
Connector Views. 8500- 0 – Fasten Seatbelts. 6216- 3 Power Mirrors. 5116- 0
Cruise Control. 6571- 0 – Fog Lights. 6210- 3 Power Seats. 5200- 0
Electronic Transmission Control. 2460- 0 – High Beam. 6210- 3 Power Windows 5133- 0
Fuel Gauge. 6210- 2 Inspection. 6210- 4 Radio 6500- 0
Fuse Data. 0670- 1 – LHTurn. 6210- 3 Rear AIC Evaporator 6414- 0
Fuse Details “License Plate” Fault 6216- 2 Rear Defogger. 6100- 1
– Fuse 5 . 0670- 7 – “Low Beam” Fault 6216- 0 Seatbelt Warning. 6131- 0
– Fuse 6 . 0670-10 – Oil Pressure Warning. 6210- 2 Seat Bolster Support 5200- 5
– Fuse 9 . 0670- 9 – “Park Brake” . 6210- 2 Self Leveling Suspension 3700- 0
– Fuse 10 0670- 8 – “Rear Lights” Fault. 6216- 2 Speedometer
– Fuse 12 0670- 7 – RH Turn 6210- 3 635 CSi 6210- 0
– Fuse 19 0670- 9 – Temperature Warning 6210- 2 M6 6210- 1
– Fuse 20 . 0670-10 – “Washer Fluid” Fault 6216- 3 Start
– Fuse 21 0670-11 Injection Electronics, 3.5i. 1360- 0 – 3.5i Electronic Transmission 1240- 0
– Fuse 26 . 0670- 8 Injection Electronics, S38 1362- 0 – 3. 5i Manual Transmission. 1240- 1
– Fuse 27 . 0670- 8 Instrument Cluster 6210- 0 – S38 1240- 2
Ground Distribution Lights Splice Location Views 8000- 0
– G101. 0670-14 – Backup. 6322- 0 Sunroof. 5413- 0
– G103,S38. 0670-12 Dash 6300- 0 TachlFuel Economy Gauge
– G103,3.5i 0670-13 – Fog .. 6312- 0 – 3.5i. 6210- 0
– G104,3.5i 0670-13 – Glove Box. 6100- 2 – S38 6210- 1
0670-14 – Hazard 6313- 0 Temperature Gauge. 6210- 2
0670-15 – Headlights. 6312- 0 Warning Indicators 6210- 0
– G104, S38 . 0670-12 Interior. 6330- 0 Windshield Washer Jet Heaters 6160- 1
0670-15 – License. 6320- 0 Wiper/Washer. 6160- 0
– G200. 0670-15 – Park. 6314- 0 The purpose of this manual is to show
electrical schematics in a manner that
makes electrical troubleshooting easier.
Electrical components which work
together are shown together on one
schematic. The Wiper-Washer schematic,
for example, shows all of the electrical
components in one diagram. At the top of
the page is the fuse (positive) that powers
the circuit. The flow of current is shown
through all wires. connectors. switches.
and motors to ground (negative) at the
bottom of the page.
Within the schematic, all switches and
sensors are shown “at rest” as though the
Ignition Switch were off. For identification.
component names are underlined and
placed next to or above each component.
Notes are included, describing how
switches and other components work.
The power distri bution schematic shows
the current feed through all the
connections from the Battery and
Alternator to each fuse and the Ignition
and Light Switches. If the Power
Distribution schematic is combined with
any other circuit schematic, a complete
picture is made of how that circuit works.
The Ground Distribution schematics show
how several circuits are connected to
common grounds.
All wiring between components is
shown exactly as it exists in the vehicle:
however, the wiring is not drawn to scale.
To aid in understanding electrical
operation, wiring inside complicated
components has been simplified. The
“Solid State” label designates electronic
components..
WIRE SIZE
CONVERSION CHART
METRIC AWG
(CROSSECTIONAL AREA (AMERICAN
IN MM2) WIRE GAUGE)
.5 20
.75 18
1 16
1.5 14
2 14
2.5 12
4 10
6 8
8 8
16 4
20 4
25 2
32 2
HOW TO USE THIS MANUAL 3
WIRE INSULATION
ABBREVIATIONS COLOR
BK BLACK
BR BROWN
RD RED
YL YELLOW
GN GREEN
BU BLUE
VI VIOLET
GY GRAY
WT WHITE
PK PINK
COMPONENTS
AIC Blower Housing .
ABS Electronic Control Unit .
ABS Hydraulic Unit.
Accessory Fuse Box ….
Active Check Control Unit
Air Bag Gas Generator …
Air Bag Safety Switch ..
Air Flow Meter (635CSi).
Air Flow Meter (M6) .
Amplifier .
Auto-Charging Flashlight
Automatic Transmission Range
Switch .
Auxiliary Fan .
Auxiliary Fan Blocking Diode.
Auxiliary Fuel Pump.
BIC Horn Diode …..
Back Up Light Switch …..
Barometric Pressure Sensor
Battery (635CSi) .
Battery (M6) .
Blower Select Relay .
Board Computer Horn .
Brake Accumulative Pressure
Switch .
Brake Fluid Level Switch.
Brake Switch .
Brake Wear Sensor .
Central Locking Control Unit.
Chime Module .
Clutch Switch .
Combination Switch
Compressor Clutch .
Compressor Clutch Diode …
Behind center console
Below RH side of windshield, behind shock tower.
Right of LH front wheel well .
LH side of engine compartment, near coolant
reservoir .
In dash, left of steering column .
In center of steering wheel.
Forward of LH shock tower .
Top RH side of engine .
Front LH side of engine compartment
RH side of trunk.
In glove box .
Under center console, on LH side of shift lever
Ahead of radiator .
Inside power distribution box .
RH side of trunk floor, below access panel .
Under LH side of fresh air intake cowl, near board
computer horn
On LH side of manual transmission
RH front of engine compartment, near Washer Fluid
Reservoir .
LH front of engine compartment .
RH rear of trunk .
Under dash, left of glove box .
Under LH side of fresh air intake cowl .
LH rear of engine compartment, near brake fluid
reservoir .
LH rear of engine compartment, on brake fluid
reservoir .
Above brake pedal .
Near each brake caliper, connected to brake pad .
Under dash, left of glove box .
Under LH side of dash, on hush panel
Above clutch pedal .
On LH side of steering column .
On front of Ale compressor .
Lower RH front of engine compartment, on RH side
of AIC compressor .
Fresh Air Door Control Unit.
Front Speed Detectors .
Fuel Injectors .
Fuel Pump Relay .
Fuel Tank Sender Switch
Fusible Link A .
Gas Filler Lock Motor .
Heater Blower Housing .
Heater Regulator .
Heater Temperature Sensor. .
High Pressure Cut-Out SWitch ..
High Speed Relay .
Horn BrushlSlip Ring .
Horns .
Hydraulic Height Level Control
System .
Hydraulic Low Pressure Switch.
Hydraulic Pressure Switch ….
Idle Speed Actuator (635CSi) ..
Idle Speed Actuator (M6) …..
Ignition Coil .
Ignition Key Switch .
Ignition Switch .
Intensive Washer Pump .
Interior Light Timer Control.
Interior Temperature Sensor
Jet Heaters .
Left Front Crash Sensor .
Level Control Unit .
Lock Heater .
Lock Heater Control Unit
Loop Contact Rings .
Main Fuel Pump .
Main Relay (635CSi) .
Main Relay (M6) .
Memory Seat Control Module ..
Memory Switches .
Motronic Control Unit .
Normal Speed Blower Resistor.
Normal Speed Relay .
On LH side of heater-A/C unit .
Back of front wheels, on dust shields
Top of engine, near each cylinder
On power distribution box .
RH side of trunk floor, below access panel .
RH rear of trunk .
In trunk, behind RH rear wheel well .
Behind center console
Behind temperature select control
On LH side of heater-AiC unit.
On receiver-drier .
In power distribution box .
Under hub of steering wheel .
Behind front grille, next to headlights…
In trunk, under spare tire .
Under LH side of car, front of rear axle .
LH rear of engine compartment, near brake fluid
reservoir .
Top center of engine .
Top center of engine .
On RH wheel well, behind washer fluid reservoir.
In upper part of steering column, part of ignition
switch .
In upper part of steering column .
Behind RH front wheel well, in reservoir .
Under LH side of dash, on body electrical bracket ..
Under LH side of dash, on hush panel
On washer jet nozzles .
Forward of LH shock tower .
Under LH side of car, front of rear axle.
In LH front door, on door lock
In left front door, near door lock
In center of steering wheel
Under car, above right rear axle .
On power distribution box .
Under RH side of dash, above glove box ..
Under front of driver’s seat .
On center console, left of park brake lever.
Under RH side of dash, above glove box .
Ahead of radiator, on auxiliary fan shield .
In power distribution box .
Normal Washer Pump.
Oil Level Sensor .
Oil Pressure Switch .
On-Board Computer Module ..
On-Board Computer Relay Box.
Outside Temperature Sensor ..
Oxygen Sensor .
Oxygen Sensor/Fuel Pump Relay
Park Brake Switch .
Passenger’s Seat Controller .
Passenger’s Seat Switches .
Power Antenna .
Power Distribution Box (635CSi)
Power Distribution Box (M6) …
Power Window Circuit Breaker
Program Selector Switch .
Pulse Wheels .
Rear Auxiliary Refrigerant Valve.
Rear Auxiliary Refrigerant Valve
Diode .
Rear Blower Motor .
Rear Evaporator Temperature
Sensor .
Rear Lights Check Relay .
Rear Speed Detectors .
Reference Point Sensor .
Right Front Crash Sensor
Right Front Door Microswitch
Safety Switch .
Seatbelt Switch .
Seatbelt Warning Timer
Speedometer Sender ..
SRS Diagnostic Module
Start Relay .
Starter .
Stepping Motor ..
Sunroof Motor ….
Sunroof Motor Relay
TDC Sensor .
Throttle Position Sensor.
Throttle Switch (635CSi) …..
Ahead of RH front wheel well, in reservoir .
Bottom of engine oil pan .
Left rear end of cylinder head .
In center of dash, right of radio face ..
Under LH side of dash, above speaker.
Under LH front side of bumper
Underneath car, on catalytic converter
Behind RH side of dash, above glove box .
In shift console, at base of parking brake
Under passenger’s seat, on frame .
On center console, right of shift lever
RH side of trunk, near hinge .
Top front of LH front wheel well .
Top front of LH front wheel well .
LH side of dash .
On center console, to right of shift lever .
Inner sides of rotors .
Under rear console
Under rear console
Under rear console, front of rear evaporator.
Under rear console, in rear evaporator …
In trunk, left of rear panel center support.
Back of rear wheels, near brake assembly
Lower LH rear of engine, LH side of transmission bell
housing .
Forward of RH shock tower
In rear of RH front door, part of door lock assembly
In center console, to left of shift lever .
In driver’s seatbelt buckle
Under LH side of dash, on body electrical bracket
In rear of differential .
Under RH side of dash .
Under LH side of dash, on body electrical bracket.
Lower LH rear of engine
Under dash, left of glove box .
Above headliner, above rear view mirror .
Above headliner, above rear view mirror .
RH front of engine, above A/C compressor
Top center of engine, behind rubber boot.
Top center of engine, behind rubberCOMPONENTS
Throttle Switch (M6) .
Transmission Control Unit .
Transmission Kickdown Switch.
Trunk Light Switch .
Trunk Lock Motor .
Underhood Light Switch .
Unlock Inhibit Switch .
Washer Fluid Level Switch ..
Water Shut-Off Valve .
Window Motors .
Wiper Motor .
CONNECTORS
C100 (B + Junction Post)
C101 (17 pins) (635CSi)
Cl0l (17 pins) (M6) .
C 102 (6 pins) (M6) .
C102 (13 pins) (635CSi) .
Cl06 (3 pins) .
Cl08 (2 pins) .
C 11 0 (2 pins)
C111 (2 pins) .
C112 (2 pins) .
C113 (3 pins) .
C 114 (8 pins) .
C 115 (2 pins) …
C 116 (2 pins) .
Cl17 (3 pins) .
Cl18 (3 pins) .
C126 (2 pins) .
C 127 (2 pins) .
C133 (2 pins) .
C140 (4 pins) .
C 141 (3 pins) .
C 150 (2 pins) .
C151 (2 pins) .
C 152 (8 pins) .
C 155 (12 pins) .
C200 (10 pins) .
Top front center of engine compartment .
Under LH side of dash, above speaker .
Passenger compartment, under accelerator pedal
In trunk lid, near trunk lock
In trunk, in trunk lock support .
Left of RH hood hinge
In driver’s door, at lock cylinder
Ahead of RH front wheel well, in lower front of
reservoir
LH rear of engine compartment .
In each door, behind panel
Under LH side of fresh air intake cowl …
On underside of power distribution box .
On RH side of power distribution box .
On RH side of power distribution box .
Inside power distribution box .
Inside power distribution box .
RH front of engine compartment .
RH front corner of engine compartment
Ahead of right headlights’ access panel …..
Underside of hood, near LH washer jet nozzle.
Underside of hood, near RH washer jet nozzle.
LH side of auxiliary fan shield .
In power distribution box, on underside of printed
circuit board
In power distribution box, on underside of printed
circuit board
Under LH side of front bumper
Top front of 3.5i engine .
Top front of 3. 5i engine .
Behind LH side of front spoiler
Behind RH side of front spoiler
Under RH side of dash, above glove box .
On lower LH side of engine
On lower LH side of engine
Behind LH front shock tower .
Behind RH front shock tower .
Under center of car, near transmission
Under RH side of dash, above glove box
Under LH side of dash, on LH side of steering
column .C201 (6 pins) …
C202 (13 pins) ..
C203 (3 pins) .
C204 (13 pins) .
C206 (29 pins) .
C208 (2 pins) .
C209 (7 pins) .
C210 (4 pins) .
C211 (2 pins) .
C214 (2 pins) .
C215 (2 pins) .
C216 (2 pins) .
C219 (2 pins) .
C220 (13 pins) .
C221 (B+ Junction Post)
(635CSi) .
C221 (B+ Junction Post) (M6) ..
C225 (1 pin). . . .
C230 (4 pins) .
C237 (1 pin) .
C250 (6 pins) .
C251 (6 pins) .
C252 (2 pins) .
C255 (2 pins) .
C260 (2 pins) .
C270 (4 pins) .
C290 (2 pins) .
C300 (2 pins) .
C301 (2 pins) .
C302 (Accessory Connector) ..
C303 (2 pins) .
C305 (4 pins) .
C306 (1 pin) .
C351 (2 pins) . . . . .
C352 (2 pinsl . . . .. . .
C353 (6 pins) . . . .. . .
C355 (1 pin). . . . .. . .
C400 (13 pins) .
C401 (13pins) .
Under LH side of dash, on LH side of steering
column .
Under LH side of dash, on LH side of steering
column .
Under RH side of dash, above glove box
Behind center console, above radio
Under LH side of dash, on body electrical bracket
Above clutch pedal .
Under LH side of dash, near body electrical bracket.
Under LH side of dash, on LH side of steering
column .
Behind RH side of radiator, taped to harness .
Under LH side of dash, near steering column .
Center of dash, behind radio .
Center of dash, behind radio .
RH side of trunk, near power antenna .
Under LH side of dash, on body electrical bracket
Lower LH side of engine, on starter
Under LH side of dash, left of clutch support
Under RH side of dash, above glove box
Inside power distribution box .
On back of alternator
Under RH side of dash .
Under rear console, top rear of rear blower motor
Under rear console, top rear of rear blower motor ..
Above clip for RH visor
Underside of steering column. . . . . . . .
Under RH side of dash. . . . . . . . . . . . .
Under RH side of dash. . . . . . . . . . . . .
Base of LH trunk hinge .
In center console, ahead of shift lever .
Under LH side of dash, on body electrical bracket.
Under rear center console
Under LH side of dash, on underside of accessory
connector .
Under RH side of dash, above glove box
RH front of trunk
LH front of trunk .
Under LH side of rear seat .
Under LH side of dash near accessory connector
Behind LH front speaker .
Behind RH frontC402 (4 pins) . . . . . . . . . . . .. Behind LH front speaker .
C421 (4 pins) . . . . . . . . . . . .. Under LH front seat .
C422 (4 pins) . . . . . . . . . . . .. Under RH front seat .
C423 (3 pins) . . . . . . . . . . . .. Under center console
C503 (3 pins) . . . . . . . . . . . .. In lower rear corner of driver’s door .
C520 (2 pins) . . . . . . . . . . . .. In lower rear corner of driver’s door .
C551 (2 pins) . . . . . . . . . . . .. Under center console, near park brake
C552B (5 pins) . . . . . . . . . . .. Under passenger’s seat .
C553B (5 pins) . . . . . . . . . . .. Under driver’s seat .
C560 (2 pins) . . . . . . . . . . . .. In driver’s door
GROUNDS
G101 (635) LH side of engine, on motor mount
G101 (M6) . . . . . . . . . . . . . .. RH rear of trunk, inside battery compartment .
G103. . . . . . . . . . . . . . . . . .. Behind RH front shock tower .
G104 (635CSi) ” Inner side of LH fender, near battery .
G104 (M6) . . . . . . . . . . . . . .. Front LH side of engine compartment, on inner
fender .
G106. . . . . . . . . . . . . . . . . .. On right hood hinge
G200 (Front Interior Ground). .. On dash frame, left of steering column
G201 (Column Ground) . . . . .. On upper LH side of steering column .
G302 (Rear Interior Ground) . .. Under LH side of rear seat .
G303. . . . . . . . . . . . . . . . . .. Above LH “B” pillar
G306. . . . . . . . . . . . . . . . . .. On hinge of RH visor
G600. . . . . . . . . . . . . . .