1994 BMW 325i Brake switch
[x] Cancel search: Brake switchPage 385 of 759
Continuity,
checking
Short
Circuits
from
Battery
CAUTION-
Use
only
a
high
quality
digital
ohmmeter
having
high
input
impedance
when
checking
electronic
componente
.
The
internal
power
source
used
in
most
analog
(swing-need1e)
meterscan
damage
solidstate
components
.
0013239
Fig
.
2
.
Digital
multimeter
being
used
to
check
for
voltage
drop
across
a
switch
.
The
continuity
test
can
beused
to
check
a
circuit
or
switch
.
Because
most
automotive
circuits
are
designed
to
have
little
or
no
resistance,
a
circuit
or
part
of
a
circuit
canbe
easily
checked
for
faults
using
an
ohmmeter
.
An
open
circuit
or
a
cir-
cuit
withhigh
resistance
will
not
allow
current
to
flow
.
A
círcuit
with
little
or
no
resistanceallows
current
to
flow
easily
.
When
checking
continuity,
the
ignition
should
be
off
.
On
cir-
cuits
that
are
powered
at
all
times,
the
battery
should
be
dis-
connected
.
Using
the
appropriate
wiring
diagram,
a
circuit
can
be
easily
tested
for
faulty
connections,
wires,
switches,
relays,
and
engine
sensorsby
checking
forcontinuity
.
For
a
continu-
ity
check
on
a
brake
light
switch,
see
Fig
.
3
..
A
short
circuit
is
exactly
what
the
narre
implies
.
The
circuit
takes
a
shorter
paththan
it
was
designed
to
take
.
The
most
common
short
that
causes
problems
is
a
short
to
ground
where
the
insulation
on
a
positive
(+)
wire
wears
away
and
the
metal
wire
is
exposed
.
When
the
wire
rubs
against
a
metal
partof
thecar
or
other
ground
source,
the
circuit
is
shorted
to
ground
.
If
the
exposed
wire
is
live
(positive
battery
voltage),
a
Puse
will
blow
and
the
circuit
may
possibly
be
damaged
.
ELECTRICAL
SYSTEM
-
GENERAL
600-
5
Brake
light
switch
Brake
pedal
in
rest
position
Q
Brake
pedal
depressed
Brake
light
switch
Fig
.
3
.
Brake
light
switchbeing
tested
for
continuity
.
With
brake
ped-
alin
rest
position
(switch
open)
there
is
no
continuity
(infinite
ohms)
.
With
pedal
depressed
(switch
closed)
there
is
continu-
ity
(zero
ohms)
.
Shorts
to
groundcanbe
located
with
a
digital
multimeter
.
Short
circuits
are
often
difficult
to
locate
and
may
vary
in
na-
ture
.
Short
circuits
can
befound
using
a
logical
approach
based
onthe
current
path
.
CAUTION
-
"
On
circuits
protected
with
high
rating
fuses
(25
amp
and
greater),
the
wires
or
circuit
compo-
nents
may
be
damaged
before
the
fuse
blows
.
Always
check
for
damage
before
replacing
fuses
of
this
rating
.
"
When
replacing
blown
fuses,
use
only
fuses
hav-
ingthe
correct
rating
.
Always
confirm
the
correct
fuse
rating
printed
on
the
fuselrelay
panelcover
DC
ELECTRICAL
TROUBLESHOOTING
Page 394 of 759
610-$
ELECTRICAL
COMPONENT
LOCATIONS
Fig
.
24
.
Brake
pedalswitches
.
Fig
.
25
.
Driver
side
airbag
connector
(arrow)
.
COMPONENT
LOCATIONS
0011751
Fig
.
26
.
Passenger
sideairbag
connector
(arrow)
behind
glove
com-
partment
.
Fig
.
27
.
Antenna
diversity
module
(arrow)
inleft
C-pillar
.
Fig
.
28
.
Right
side
offuel
tank
under
rear
seat
cushion
.
0013108
0013010
0013142
Page 396 of 759
610-10
ELECTRICAL
COMPONENT
LOCATIONS
Component
Model
Year
Location
Refer
to
ABS
Hydraulic
Control
Unit
1992-1998
Left
rear
engine
compartment
undermaster
cylinder
Fig
.
7
.
Fig
.
10
.
ABS
Hydraulic
Control
Unit
Relay
1992-1998
Power
distribution
box
Fig
.
2
.
ABS
Pedal
Travel
Sensor
1992-1998
On
brake
booster
beside
master
cylinder
Fig
.
10
.
ABS
Relay
1992-1998
Power
distribution
box
Fig
.
2
.
ABS/AS
T
(Traction)
Control
Module
1992-1998
Behind
glove
compartment
Fig
.
8
.
Fig
.
9
.
ABS
Speed
Sensor,
Left
Front
1992-1998
Left
front
steering
arm
Fig
.
31
.
Wheel
ABS
Speed
Sensor,
Left
Rear
1992-1998
Left
rear
trailing
arm
Wheel
ABS
Speed
Sensor,
RightFront
11992-1998
Right
front
steering
arm
Wheel
ABS
Speed
Sensor,
Right
Rear
1992-1998
I
Left
rear
trailing
arm
Wheel
1
A/C
Compressor
1
1992-1998
(
Rightlower
frontof
engine
A/C
Compressor
Control
Relay
1
1992-1998
1992-1998
1992-1998
A/C
Control
Module
A/C
Evaporator
Temperature
Sensor
A/C
Pressure
Switch
1992-1998
Right
frontof
engine
compartment
A/C
Program
Switch
1992-1998
Center
of
dash
below
radio
A/CRecharging
Ports
1992-1998
Right
rear
engine
compartment
Fig
.
16
.
Air
Flow
Sensor
1992-1998
Between
throttle
housing
&
filter
housing
Fig
.
7
.
Airbag
Contact
Slip
Ring
1992-1998
Rear
ofsteering
wheel
Airbag,
Driver
1992-1998
In
center
of
steering
wheel
Fig
.
25
.
Airbag,
Passenger
1994-1998
Right
front
of
dash
above
glove
compartment
Fig
.
26
.
Airbag,
Side-Impact
1997-1998
Behind
right/left
front
door
panel
Airbag
Control
Module
(Basic)
1992-1993
Behind
glove
compartment
Fig
.
8
.
Fig
.
9
.
Airbag
Control
Module
(ZAE)
1994-1998
On
center
tunnel
under
rear
seat
cushion
Airbag
Crash
Sensor,
Airbag
1992-1993
On
righUleft
front
strut
tower
Airbag
Crash
Sensor,
Right/Left
1997-1998
Right/left
door
si¡¡
behind
front
seatSide
Impact
Alternator
(Generator)
1992-1998
Left
lowerfront
of
engine
Amplifier
Hi-fi
1992-1998
Left
front
side
of
luggage
compartment
Antenna
Amplifier
AM/FM
1992-1998
In
upper
left
side
C-pillar
Fig
.
27
.
COMPONENT
LOCA
TIONS
Table
a
.
E36
Component
Locations
Power
distribution
box
Fig
.
2
.
Behind
center
console
Left
sideof
heater
box
Continued
Page 397 of 759
Table
a
.
E36
Component
Locations
Component
Model
Year
Location
Refer
to
Anti-theft
Control
Module
1992-1998
Behind
glove
compartment
Fig
.
8
.
Fig
.
9
.
Anti-theft
Horn
1
1992-1998
1
Right
rear
engine
compartment
Anti-slip
(Traction)
Control
Module
1994-1998
Power
distribution
box
Fig
.
8
.
(AST/ASC+T)
Fig
.
9
.
Anti-slip
(Traction)
Control
Switch
1994-1998
In
center
console
Automatic
Climate
(A/C)
Control
1992-1998
Behind
center
console
Module
AutomaticTransmission
Range
1992-1998
~
Next
to
gear
shift
lever
in
center
console
Fig
.
29
.
Switch
(Gear
Position/Neutral
Safety
Switch)
Auxiliary
Cooling
Fan
Dual
Switch
1992-1998
Right
side
radiator
1
Fig
.
18
.
Auxiliary
Cooling
Fan
Motor
1992-1998
Behind
front
grill
Auxiliary
Fuse
Box
(Left
Splice
1992-1998
I
Behind
left
front
footwell
kick-panel
Panel)
Auxiliary
RelayPanel
1
1992-1998
1
Left
side
of
dash
under
steering
column
Auxiliary
Fuse
Box
In
Trunk
1
1997-1998
1
Right
sideof
trunk
behind
trim
panel
AuADSry
ThrottlePosition
Motor
11994-1998
Front
of
engine
compartment
B+
Jump
Start
Junction
Point
1992-1998
Right
rear
of
engine
compartment
Fig
.
7
.
Back-Up
Light
Switch
(Manual)
1992-1998
Right
or
left
side
top
of
transmission
Fig
.
30
.
Body
Electronics
Control
Module
1994-1998
Behindglove
compartment
Fig
.
8
.
(ZKE
IV)
Fig
.
9
.
Brake
Fluid
Level
Sensor
1992-1998
Top
of
brake
fluid
reservoir
at
master
cylinder
Fig
.
15
.
Brake
Light
Switch
1
1992-1998
1
On
brake
pedal
supportbracket
Brake
Pad
Sensor,
Left
Front
1
1992-1998
1
Left
front
brake
caliper
Brake
Pad
Sensor,
Right
Rear
1992-1998
Right
rear
brake
caliper
Camshaft
Actuator
(VANOS)
1993-1998
Front
of
cylinder
head
Camshaft
Position
Sensor
(Cylinder
1992-1998
Front
of
engine
Identification)
Carbon
Canister
Valve
(TLEV)
1
1997-1998
1
In
sparewheel
well
in
trunk
ELECTRICAL
COMPONENT
LOCATIONS
610-11
Fig
.
5
.
Fig
.
4
.
Fig
.
24
.
Fig
.
7
.
Central
Locking
Module
(ZVM)
11992-1993
1
Behindglove
compartment
I
Fig
.
8
.
Fig
.
9
.
Check
Control
Module
(if
applicable)
1
1992
-
1998
1
Below
left
side
of
dash
Child
Protection
Window
Control
1992-1998
Center
console
(console)
Chime
Module
1992-1998
Below
left
side
of
dash
inleft
dash
trim
panel
Clock
(Multi-Function)
1993-1998
Center
console
Clutch
Pedal
Switch
1992-1998
On
clutch
pedal
support
bracket
Continued
COMPONENT
LOCATIONS
Page 402 of 759
610-16
ELECTRICAL
COMPONENT
LOCATIONS
Component
Model
Year
Location
Refer
to
MixingSwitch
1992-1994
Center
console
Multi-Function
Clock
1992-1998
Center
console
Multi-information
Display
(MDI)
1992-1998
Center
console
Normal
Speed
Cooling
Fan
Relay
1992-1998
Power
distribution
box
Fig
.
2
.
Neutral
SafetySwitch
(Automatic
1992-1998
Next
to
gear
shift
lever
in
center
console
Fig
.
29
.
Transmission
Range
Switch)
Oil
Pressure
Switch
1992-1998
Left
front
of
engine
below
intake
manifold
at
oil
filter
housing
On-Board
Computer
1992-1998
Center
console
On-BoardComputerHorn
Relay
1992-1998
Behind
glove
compartment
Fig
.
8
.
Fig
.
9
.
On-Board
Computer
Temperature
11992-1998
I
Right
front
of
engine
compartment
Sensor
Outside
Temperature
Sensor
1992-1997
Inright
front
brake
cooling
duct
Outside
Temperature
Sensor
1998
Right
rear
of
engine
compartment
behind
fresh
air
cowl
Oxygen
Sensor
HeaterRelay
1992-1998
Power
distribution
box
Fig
.
2
.
Oxygen
Sensor(s)
1992-1998
On
exhaust
pipe
ahead/behind
catalytic
converter
(M42/M44
engine)
Oxygen
Sensor
(x2)
1992-1995
On
exhaust
pipe
ahead
of
catalytic
converter
(M50/S50US
engine)
Oxygen
Sensors
(x4)
1996-1998
On
exhaust
manifold/exhaust
pípe
behind
catalytic
converter
(M52/S52US
engine)
Parking
Brake
Switch
1
1992-1998
I
On
rear
of
parking
brake
lever
Power
Distribution
Box
11992-1998
I
Rear
left
of
engine
compartment
I
Fig
.
2
.
Fig
.
7
.
Fig
.
10
.
Radio
Microswitch
1992
-
1996
Center
console
behind
radio
Radio
Receíver
1
1997-1998
1
Right
rear
luggage
compartment
Relay
And
Fuse
Box
(Power
1992-1998
I
Left
side
of
engine
compartment
I
Fig
.
2
.
Distribution
Box)
Fig
.
7
.
Fig
.
10
.
Rear
Window
Blower
1994-1998
Behind
rear
seat
(convertible)
Rear
Window
Blower
Microswitch
1994-1994
At
convertible
top
linkage
Rear
Window
Blower
Microswitch
1995-1998
Behind
rear
seat
(convertible)
Rear
Window
BlowerRelay
11994-1998
Behind
glove
compartment
Fig
.
8
.
Fig
.
9
.
Fig
.
2
.
Fig
.
30
.
Fig
.
8
.
Rear
Window
DefoggerRelay
Reversing
(Back-up)
Light
Switch
SplicePanel,
Right
Rollover
Protection
Actuator
11994-1998
COMPONENT
LOCATIONS
Table
a
.
E36
Component
Locations
1992-1998
1992-1998
1992-1998
Power
distribution
box
Right
or
left
side
top
of
transmission
Behind
glove
compartment
Behind
rear
seat
(convertible)
Fig
.
9
.
Continued
Page 489 of 759
EKE
Power
1992-
VIO
FROMIGNITION
U
VIO
FROM
IGNITI
ON
SWITCH
SWITCH
2S
(DIAGRAM3OF7)
31
(DIAGRAM3OF7)
I
-
______________-__________--
4
-_____________________I_-FRONT
POWER
O
3
3
3
3
i
14
8
8
B
18
7
26
-
4
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F-,
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-BOARD
CHECKCONTROL
WIPER
WIPER
MOTOR
INSTRUMENT
BRAKELIGHT
CRUISE
CONTROL
CRUISE
CONTROL
COMPRESSOR
NORMALCOMPUTER
MODULE
RELAYRELAY
CLUSTER
SWITCH
MODULE
SWITCH
CONTROL
SPEEDRELAYRELAY
GRN
0
FROM
IGNITION
GRN
P
FROM
IGNITION
~I
I
VSWITCH
SWITCH
(DIAGRAM
30F7)
,~
(DIAGRAM
3OF7)
-------_-_____________________________________________~FRONT
POWER
TO
I
DISTRIBUTIONBOX
FUSE
F23
G
(DIAG
RAM
4
0F
7)
I
FUSE
FUSE
FUSE
FUSE
FUSE
'
F26
F24
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AUTOMATIC
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TRANSMISSION
AUXILIARY
RANGESWITCH
I
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I
CONNECTOR
MIRRORCONTROL
LIGHT
LOWBEAM
AUTOMATIC
PROGRAM
INSTRUMENT
SWITCHSWITCH
LIGHTRELAY
TRANSMISSION
SWITCH
CLUSTER
WIOEGSONLY
RANGESWITCH
FROM
___________-----1FRONTPOWER
FUSEF24
CI
DISTRIBUTION
BC
3
(DIAGRAM30F7)
FUSE
FUSEFUSE
F23
F22
F21
O
O
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5A
DATA
LINK
6
j
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I
CONNECTOR
REVERSING
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CANADA
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INTEGRATED
COMBINATION
INSTRUMENT
REAR
JETHEATER
MULTI-
UNLOADER
DAYTIMERUNNING
LIGHT
ASSSLIP
ABSRELAY
CLIMATE
SWITCH
CLUSTER
DEFOGGER
THERMOSWITCH
FUNCTION
RELAY
LIGHTSCODING
SWITCH
CONTROL
REGULATION
RELAY
CLOCK
DIODE
MODULE
CONTROL
MODULE
64776
Page 495 of 759
8317
4
FROMIGNITION
T
VIO
FROM
IGNITION
U
VIO
"I"
IGNITION
SWITCH
SWITCH
SWITCH
(DIAGRAM2OF5)
29
(DIAGRAM20F5)
31
(DIAGRAM20F5)
FROMIGNITION
GRIN
PROMIGNITION
SWITCH
SWITCH
(DIAGRAM20F5)
~(DIAGRAM20F5)
REVERSING
LIGHT
SW
TO
DATA
LINK
CONNECTOR
Power
Distribution
1994-95
Except
318ti
(3
of
5)
______________________________________________
-_-
FRONTPOWER
ELECTRICAL
WIRING
DIAGRAMS
ELE-11
3
FUSE
FUSE
I
DISTRIBUTION
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CONTROL
CRUISECONTROL
TRANSMITTER
COMPRESSOR
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HIGH
COMPUTERMODULE
RELAY
RELAY
CLUSTER
SWITCH
MODULE
SWITCH
MODULE
CONTROL
SPEEDSPEED
(EWSIN
RELAYRELAYRELAY
(1995)
,FRONT
(POWER
DISTRIBUTION
FUSE
FUSE
FUSE
(BOX
FUSE
I
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AUXILIARY
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RIG
H7
PARK
HIGH
BEAM
I
I
I
I
HEATER
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LEFT
PARK
LIGHT
LOWBEAM
LIGHT/LICENSE
LIGHT
AUTOMAT
IC
PROGRAM
THROTTLE
SWITCH
LIGHT
SWITCH
LIGHT
PLATE
LIGHT
RELAY
HROTTLE
STARTER
(
(1995)
TRANSMISSIONSWITCH
FLAP
IMMOBILIZATION
994)
RELAY
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RANGESWITCH
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RELAY
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--
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SERVOTRONIC
CONTROLMODULE
(1995)
FROM
FRONTPOWER
I
FU
SEF24
I
DISTRIBUTIONBOX
I
(DIAGRAM
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FUSE
FUSE
FUSE
II
F23
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61
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23
INTEGRATED
COMBINATION
INSTRUMENT
PEAR
MULTI-
UNLOADER
SLIP
CONTROL
LIGHT
ASC
ABSSLIP
ASS
RELAY
CLIMATE
SWITCH
CLUSTER
DEFOGGER
FUNCTION
RELAY
MODULE
(AB
S)
SWITCH
SWITCH
CONTROL
REGULATION
RELAY
CLOCK
(1995)
MODULE
CONTROL
MODULE
INSTRUMENT
CLUSTER
Page 500 of 759
ELE-16
ELECTRICAL
WIRING
DIAGRAMS
88978
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F16
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GRN
(DIAGRAM
4OF5)
___
--------
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SWITCH
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1996-97
Except
318ti
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MODULE
(EWS11)
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-----
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PUMPMODULE
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(1996
CANADA)
(1996
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SEAT
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MAPLIGHT
CONTROLMODULE
MIRROR
LIGHT
INTERIOR
(1996)
DETECTOR
ASSEMBLY
(199fi)
FROMFISE
141
---
(DIAGRAM
30F5)
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TRANSMITTER
COMPUTER
CONTROL
RELAY
MOTOR
IMMOBILIZATION
MODULE
CLUSTER
SWITCH
MODULE
SWITCH
MODULE
MODULE
(1996)
RELAY
SWITCH
(1996)
(1998)
(1997)
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