ad blue BMW 318i 1997 E36 Workshop Manual
Page 50 of 759
100-8
ENGINE-GENERAL
Symptom
1
Probable
cause
and
correctiveaction
1
.
Engine
will
not
start
or
run
.
Starter
cranks
a
.
No
fuel
reaching
engine
.
Check
forfuelin
tank
.
engine
at
normal
speed
.
Fuel
pump
notoperating
.
Repair
Group
160
b
.
No
spark
.
Check
ignition
system
.
Repair
Group
120
c
.
Incorrect
valve
timing
.
Check
timing
chain
.
Repair
Group
117
2
.
Check
Engine
warning
light
illuminated
.
a
.
DME
engine
management
system
self-diagnostic
fault
detected
.
Sea
an
authorized
BMW
dealer
or
other
qualified
shop
for
OBD
II
fault
code
diagnosis
.
See
also
On-
board
Diagnostics(OBD),
given
later
inthis
repair
group
.
3
.
White
exhaust
smoke
(steam)
.
a
.
Failed
cylinder
head
gasket
(probably
accompanied
bylowcompression
readings)
.
Replace
gasket
and
resurface
cylinder
head
if
necessary
.
Repair
Group
113
4
.
Blue-gray
exhaust
smoke
and
oily
spark
a
.
Contaminated
or
gasoline-diluted
engine
oil
.
Change
engine
oil
and
replace
oil
filter
.
plugs
.
Indicates
oii
burning
in
combustion
.
Repair
Group
020
b
.
Faulty
valve
guide
seals
or
valve
guides
.
Replace
valve
guide
oil
seals
or
overhaul
cylinder
head
.
Repair
Group
116
5
.
Pinging
or
rattling
when
under
load,
a
.
Ignition
timing
too
advanced
.
Ignition
knocksensors
faulty
(CheckEngine
light
traveling
uphill,
or
accelerating,
especially
illuminated)
.
Repair
Group
120fromlow
speeds
.
Indicates
pre-ignition
or
b
.
Fuel
octane
leve¡
toolow
.
detonation
.
c
.
Engine
running
too
hot
or
overheating
.
Check
cooling
system
.
Repair
Group
170
6
.
Light
metallic
tapping
that
varies
directly
with
engine
speed
.
Oil
pressure
warning
light
not
illuminated
.
7
.
Light
metallic
knock
that
varies
directly
with
enginespeed
.
Oil
pressure
warning
light
blinking
or
fully
illuminated
;
may
be
most
noticeable
during
hard
stops
or
cornering
.
8
.
Screeching
or
squealing
under
load
that
a
.
Loose,worn,
or
damaged
drive
belt
.
Inspect
belt(s)
.
Repair
Group
020
goesaway
when
coasting
.
9
.
Growling
or
rumbling
that
varieswith
engine
a
.
Remove
drive
belt(s)toidentifyfaulty
component
.
Check
for
play,
bearing
roughness,
rpm
.
Indicates
abad
bearing
or
bushing
in
and
loose
mountings
.
Refer
to
appropriate
repair
group
for
repair
procedures
.
an
engine-driven
accessory
.
DRIVEABILITY
TROUBLESHOOTING
On-Board
Diagnostics
(OBD)
On-Board
Diagnostics
is
incorporated
into
al¡
engine
man-
Two
generations
of
OBD
are
usedon
thecars
covered
by
agement
systems
used
on
the
cars
covered
by
this
manual
.
this
manual
:
Therefore,
checking
for
fault
codes
should
be
the
first
step
in
troubleshootinga
driveability
problem
.
For
additional
informa-
On-Board
Diagnostics
tion
on
engine
management
and
repair
see130
Fuel
Injec-
tion
.
"
1992-1995models
....
.
..
....
.
..
.......
OBD
I
"
1996-1998models
.
....
..
.
.
.
..
.
........
OBD
II
DRIVEABILITY
TROUBLESHOOTING
Tablec
.
Engine
Mechanical
Troubleshooting
b
.
Warped
or
cracked
cylinder
head
.
Resurface
or
replace
cylinder
head
.
Repair
Group
113
c
.
Cracked
cylinder
block
.
Replace
engine
or
short
block
.
c
.
Worn
piston
rings
.
Overhaul
or
replace
engine
.
d
.
Failed
cylinder
head
gasket
.
Replace
gasket
.
Repair
Group
113
d
.
Air/fuel
mixture
too
lean
(Check
Engine
light
illuminated)
.
Repair
Group
130
a
.
Valveclearances
excessive
.
Check
hydraulic
valve
adjusters
.
Repair
Group
116
b
.
Low
oil
pressure
orpossibly
defective
warning
light
circuit
.
Check
oil
pressure
andwarning
light
circuit
.
Repair
Group
119
c
.
Dirty
oil
.
Change
oil
.
Repair
Group
020
.
a
.
Low
oil
leve¡
.
Check
and
correct
oil
leve¡
.
b
.
Low
oil
pressure/worn
or
faulty
oil
pump
.
Oil
pump
pickup
restricted/clogged
.
Check
oil
pressure
.
Repair
Group
119
The
OBD
system
detects
emissions-related
engine
manage-
ment
malfunctions
and
tucos
on
the
Check
Engíne
lightin
the
in-
strument
cluster
.
TheCheck
Engine
light
will
stay
on
until
the
code(s)are
called
up
and
the
memory
is
erased
.
When
faulty
are
detected,
the
OBD
system
stores
a
Diagnostic
Trouble
Code
(DTC)
in
the
system
ECM
.
In
addition,
the
Check
Engine
warn-
ing
light
will
come
on
if
an
emissions-related
fault
is
detected
.
Page 132 of 759
120-8
IGNITION
SYSTEM
1
1
.0
GN
1
.0
Gl
.0
GN
I
Ign
coil
1
.0
GN
.
Tti
%ti
r,
_%ti
_
_
ice_
I
25
52
5524
51
54
56
I
Power
input
power
input
t
U
Engine
Control
Module
(Bosch
DME
Ml
.7)
II
Powerinput
Mainrelaycontrol
I
15
42
43
16442868
67
34
6
26
27
1
-----
__
V
_
--
_
~
8K
.35
BK
.35
13,1
1
.35
YE
1
.35
BK35
VE
.35
3
cyl
.1
1
11
E
S
2
1
.0
BR
2
.5
BR
Ign
.
coil
cyl
.
3
II
Ign
.
coil
Ign
.
coil
3
cyI
.
2
1
Y
_
Y
2
k
3
cyl
.
4
IGNITION
SYSTEM
SCHEMATICS
Battery
voltage
in
run
or
start
(
vía
ignition
switchterminal
15)
WIRING
COLOR
CODE
4
.0
GN
1
.0
BR'V
.
Camshaft
Knock
Sensor
Knock
Sensor
Position
(cyl
.1-2)
(cyl
.3-4)
Sensor
Fig
.
13
.
Bosch
DME
M1
.7
ignition
system
circuit
for
M42
engine
.
Ground
(RH
rearof
engine
compartment,
rear
of
shock
tower)
N[INS
Crankshaftlrpm
Position
Sensor
Battery
voltage
in
run
or
start
(vía
main
relay
terminal
87)
Ground
(RH
rearof
engine
compartment,
rearof
shock
tower)
5GN
BK
-
BLACK
BR
"
BROWN
RD
-
RED
YL-
YELLOW
GN
-
GREEN
BL
-
BLUE
VI
-
VIOLET
GY
-
GREY
WT
-
WHITE
PK
-
PINK
Warning
:
Lethal
voltagepresent
Battery
voltage
at
all
times
to
Main
relay
(terminal
85)
'Y
Y
---------------------
0013087
Page 133 of 759
^1
.5WT
^1
.5RD
^1
.5YL
^1
.5BL
r
--__
____-
__-_
___-_
-___-_____--__--
-____-___
____-
i
26
g
5022
23
54
5
I
Power
input
power
input
I
Engine
Control
Module
(Bosch
DME
M5
.2)
I
I
grounds
I
P
owerinput
Main
relay
control
I
70
40
71
21
2078
34
55
626
27
----------------------
-
---------
-
--
-
------------
-
-----------
.,
v
1
1
.1
v
`
1
35BK
35BK
2
(
1Y
¡3
194
Knock
Sensor
Knock
Sensor
(cyl
.1-2)
(cyl
.3-4)
Frommain
relay
terminal
87
(battery
voltage
in
run
or
start
Battery
voltage
in
run
or
start
(
via
ignition
switch
Warnin
terminal
15)
Lethal
óltage
WIRING
present
COLOR
CODE
2
.5
GN
'
1
.0
YL
/
1
.0
BL
/
1
.0
RDNJT
.35
BK
/
/
.35
BK
Camshaft
Position
Sensor
-_
Fig
.
14
.
Bosch
DME
M5
.2
ignition
system
circuit
for
M44
engine
.
Ground
(RH
rear
of
engine
compartment,
rearof
shock
tower)
Crankshaftirpm
Position
Sensor
IGNITION
SYSTEM
120-9
Batteryvoltage
Battery
voltage
in
run
or
start
in
run
or
start
(via
main
relay
(
via
ignition
switch
terminal
87)
terminal
15)
BK
-
BLACX
BR
-
BROWN
RD
-
RED
YL
-
YELLOW
GN
-
GREEN
BL
-
BLUE
VI
-
VIOLET
GY
-
GREY
WT
-
WHITE
PK
-
PINK
Battery
voltage
at
all
times
to
Main
relay
(terminal
85)
Ground
(RH
rear
of
engine
compartment,
rearof
shock
tower)
0012721
lGNITION
SYSTEM
SCHEMATlCS
Page 134 of 759
120-10
IGNITION
SYSTEM
Ground
(rear
of
engine
compartment,
rear
of
passenger
side
shock
tower)
.!
BK
Camshaft
Position
Sensor
IGNITION
SYSTEM
SCHEMATICS
Batteryvoltage
in
run
or
start
(
via
ignition
switch
terminal
15)
---------------------------------------------------------
55
S5154
i
power
input
Power
input
1
DME
Control
Module(Bosch
DME
M3
.1)
Ground
-
(RHrear
of
enginecompartment,
rearof
passenger
side
shock
tower)
Fig
.
15
.
Bosch
DME
M3
.1
usedon1992
M50
engines(without
VANOS)
.
.EBK
Crankshaftlrpm
Position
Sensor
5GN
1.0
RD
Ground
(RH
rearof
enginecompartment,
rear
of
passenger
side
shock
tower)
WIRING
COLOR
CODE
BK
-
BLACK
BR
-
BROWN
RD
-
RED
YL
-
YELLOWGN
-
GREEN
BL
-
BLUE
VI-
VIOLET
GY
"
GREY
WT
"
WHITE
PK
-
PINK
Batteryvoltage
in
run
or
start
(
via
main
relay
Battery
voltage
terminal
87)
in
run
or
start
(via
ignition
switch
terminal
15)
11508
1
grounds
Main
rela
control
P
ower
Input
Y
I
-
34
---"--
6
26
27
1
Battery
voltage
at
all
times
to
Main
relay
(terminal
85)
Page 136 of 759
120-12
IGNITION
SYSTEM
Warning
.
Lethal
voltagepresent
Battery
voltage
in
run
or
start
(via
ignitíon
switch
terminal
15)
I
t
IGNITION
SYSTEM
SCHEMATICS
Battery
voltage
in
run
or
start
(
via
ignition
switchterminal
15)
WIRING
COLOR
CODE
Knock
Sensor
Knock
Sensor
Crankshaftlrpm
Camshaft
(cyl
.
1-3)
(cyl
.
4-6)
Position
Sensor
Position
-
-
Sensor
-
Fig
.
17
.
Siemens
MS
41
.1
ignition
systemusedon1996
and
later
6-cylinder
engines
.
1.0
BR
PQ
1
.08~1
.0BKIRD
/1
.0BK/YL
'10BK/BL
'1
.03KIGN
10BKNI
4
1D
BK
-
BLACK
BR
-
BROWN
RD
-
RED
YL
-
YELLOW
GN
-
GREEN
BL
-
BLUE
VI-
VIOLET
GY
-
GREY
WT
-
WHITE
PK
-
PINK
Batteryvoltage
in
run
or
start
(via
main
relay
terminal
87)
!1
rl
1.0
B~
^
1.0
BK/RD
^
1.0
BKIYL
^
1
.0
BK/BL
n
1.0
BK/GN
n
1
.0
BKIVI
%~
r
-------
--------------_____________----_______-_-____
49
29
1
30
2
31
3
8754
1
power
input
Power
input
I
1
Engine
Control
Module
(Siemens
MS
41
.1)
1
1
grounds
1
n
1
Powerinput
Mainrelaycontrol
1
1-
57
___
58
_
59
_
__
63
_
38
83
48
40
64
43
65
41
28
32
34
4
26
73
1
-
-----------
-
_-----
-
------
_
------
-
------
-
---
-
.5Y1-
.5BKY.5GNY.5BRY
Y
.35BKY
1
Y
Y
.35BKY/Y35YY
75
.18R/
.5YL-1
1'
.
Batteryvoltage
at
all
times
to
Main
relay
(terminal
85)
Ground
v
(RH
rear
of
engine
Z
compartment,
rear
=
of
shock
tower)
Ground
(RH
rear
of
enginecompartment,
rearof
shock
tower)
0012731
Page 191 of 759
Fig
.
9
.
Fuel
pump
relay
terminal
identification
.
Fuel
Pump
Electrical
Tests
Troubleshooting
of
any
fuel
pump
fault
should
begin
with
checking
the
fuel
pump
fuse
and
the
fuel
pump
relay
.
The
DME
main
relay
should
also
be
checked
.
NOTE-
Special
tools
are
requíred
for
some
of
the
tests
de-
scribed
here
.
Fuel
pump
electrical
circuit,
testing
The
fuel
pump
electrical
circuit
diagram
is
shown
in
Fig
.
10
.
3
.
If
fuel
pump
does
not
run,
disconnect
black
harness
connector
from
tank
sender
unit
.
With
jumper
wire
con-
nectedas
described
in
step
2
above,
check
for
positive
(+)
batteryvoltage
at
harness
connector
terminals
.
See
Fig
.
11
.
FUEL
TANK
AND
FUEL
PUMP
160-
7
From
Main
Relay
(+15
power
with
key
in
run
From
B+juretion
point
orstartposition)
(batteryvoRageatalltirnes)
'
.5
RD/Nrr
1
.5
RD
1
.5
GNNI
From
Engine
2
.5
GNNI
Control
Module
15
2
.5
GNNI
Ground
(below
center
console)
Fig
.
10
.
Fuel
pump
electrical
circuit
.
30
-~
Relay
Fuel
Pump
8~T
I
1
s
ám
61
Front
Power
I
a
1
Distribution
Box
I_
16
WIRING
COLOR
CODE
BK
-
BLACK
BR
-
BROWN
Fuel
Pump
RD
-
RED
(in-tank)
M
YL
YELLOWGN
-
GREENBU
-
BLUE
1
VI
-
VIOLET
GY
-
GREY
WT
-
WHITE
PK
-
PINK
0011946
4
.
If
voltage
and
groundare
present,
fuel
pump
is
proba-
bly
faulty
.
If
there
is
no
voltage,
check
wiring
From
fuel
pump
Reay
and
make
sure
Reay
is
functioning
correctly
.
CAUTION-
Fuseandrelaylocationsmayvary
.
Usecara
when
Fuel
pump
power
consumption,
testing
troubleshooting
the
electrical
system
at
the
fuselrelay
panel
.
To
resolve
problems
in
identify-
NOTE-
ing
a
relay,
see
en
authorízed
BMW
dealer
.
"
To
achieveaccurate
testresults,
fhe
battery
voltage
at
the
connector
should
be
approximately
13
volts
.
1.
Remove
rearseat
cushion,
pull
right
side
insulation
mat
Charge
the
battery
asnecessary
.
back
to
expose
fuel
tank
accesscover
.
Remove
cover
.
q
higher
than
normal
power
consumption
usually
fin-
to
expose
wiring
connections
.
dicates
a
worn
fuel
pump,
which
may
cause
intermit-
tentfuel
starvation
due
lo
pump
overheating
and
2
.
Remove
fuel
pump
relay
and
opérate
fuel
pump
as
de-
seizure
.
The
only
remedy
is
pump
replacement
.
Be
scribed
under
Operating
fuel
pump
for
tests
earlier
.
sure
to
check
that
thereturn
fine
and
the
pump
pickup
Pump
should
run
.
Disconnect
jumper
wire
when
fin-
are
not
obstructed
before
replacing
the
pump
.
ished
.
1
.
Remove
rear
seat
cushion,
pull
right
side
insulation
mal
back
to
expose
fuel
tank
accesscover
.
Remove
cover
to
expose
wiring
connections
.
2
.
Disconnect
(black)
harness
connector
from
fuel
pump
.
3
.
Connect
an
ammeter
and
an
insulated
jumper
wire
be-
tween
terminals
in
connector
and
corresponding
pump
terminals
.
See
Fig
.
12
.
FUEL
PUMP
Page 382 of 759
600-2
ELECTRICAL
SYSTEM-GENERAL
CAUTION
-
"
Always
turn
off
the
engine
and
disconnect
the
negative
()
cable
from
the
batterybefore
remov-
ing
any
electrical
components
.
Disconnecting
the
battery
may
erase
fault
code(s)
stored
in
control
module
memory
.
Check
for
fault
codes
using
spe-
cial
BMW
diagnostic
equipment
.
"
Prior
to
disconnecting
the
battery,
read
the
bat-
tery
disconnection
cautions
given
at
the
front
of
this
manual
onpage
viii
.
"
Connect
and
disconnect
ignition
system
wires,
multiple
connectors,
and
ignition
test
equipment
leads
only
while
the
ignition
is
off
.
"
Do
not
disconnect
the
battery
with
engine
run-
ning
.
"
Do
not
quick-charge
the
battery
(for
boost
start-
ing)
for
longer
than
one
minute,
and
do
not
ex-
ceed
16
.5
volts
at
the
battery
with
the
boosting
cables
attached
.
Wait
at
feast
one
minute
before
boosting
the
battery
a
second
time
.
"
Do
not
usea
test
famp
that
has
a
normal
incan-
descent
bulb
to
test
circuits
contafning
electronic
components
.
The
high
electrical
consumptionof
these
test
lamps
may
damage
the
components
.
"
Do
not
use
an
analog
meter
.
Use
onfy
a
digital
multimeter
.
"
Many
of
the
solid-state
modules
are
static
sensi-
tive
.
Static
discharge
will
permanently
damage
them
.
Always
handle
the
modules
using
proper
static
prevention
equipment
and
techniques
.
"
To
avoid
damaging
harness
connectors
or
relay
panel
sockets,
use
jumper
wires
with
flat-blade
connectors
that
are
the
same
size
as
the
connec-
tor
or
relay
terminals
.
"
Always
switch
a
digital
multimeter
to
the
appropri-
ate
function
and
range
before
making
test
con-
nections
.
"
Do
not
tryto
start
the
engine
of
a
carwhich
has
been
heated
above176°F
(80°C),
(for
example,
in
a
paint
dryingbooth)
.
Allow
it
to
cool
to
normal
temperature
.
"
Disconnect
the
battery
before
dolng
any
electric
welding
on
the
car
.
"
Do
not
wash
the
engine
while
it
is
runnfng,
or
any-
time
the
ignition
is
switched
on
.
WIRING
DIAGRAMS
Electrical
Test
Equipment
Many
of
the
electrical
tests
described
in
this
manual
call
for
measuring
voltage,
currentorresistanceusing
a
digital
multi-
meter
(DMM)
.
Digital
meters
are
preferred
for
precise
mea-
surements
and
for
electronics
work
because
they
are
generally
more
accuratethan
analog
meters
.
The
numerical
display
is
alsoless
likely
to
be
misread,
since
there
is
no
nee-
dle
position
to
be
misinterpreted
by
reading
at
an
angle
.
An
LED
test
light
is
a
safe,
inexpensive
tool
that
can
be
used
to
perform
many
simple
electrical
tests
that
would
otherwise
require
a
digital
multimeter
.
The
LED
indicates
when
voltage
is
present
between
anytwo
test-points
in
a
circuit
.
CA
UTION-
"
Choose
test
equipment
carefully
.
Use
a
digital
multimeter
with
at
leadt
10
megaohm
input
im-
pedance,or
an
LED
test
light
.
An
analog
meter
(swing-need1e)
ora
test
light
with
a
normal
incan-
descent
bulb
may
draw
enough
current
to
dam-
age
sensitive
electronic
components
.
"
An
ohmmeter
must
not
beused
to
measure
resis-
tance
on
solidstate
components
suchas
controlunits
or
time
delay
relays
.
"
Always
disconnect
the
battery
before
making
re-
sístance
(ohm)
measurements
on
the
circuit
.
WIRING
DIAGRAMS
The
wiring
diagrams
shown
in
Electrical
Wiring
Diagrams
have
been
specially
designed
to
enable
quick
and
efficientdi-
agnosis
and
troubleshooting
of
electrical
malfunctions
.
Wiring
Codes
and
Abbreviations
A
lot
of
information
is
included
in
each
wiring
diagram
if
you
know
how
to
read
them
.
Wire
colors
in
the
diagrams
are
ab-
breviated
.
Combined
color
codes
indicate
a
multi-colored
wire
.
For
example
the
code
BLU/RED
indicates
a
Blue
wire
with
a
Red
stripe
.
Many
electrical
components,
connectors,
fuses,
and
ground
locations
are
identified
using
a
unique
number
.
Each
of
there
numbers
corresponds
to
a
particular
part
in
the
circuit
commonly
found
in
Electrical
Wiring
Diagrams
.
Page 383 of 759
NOTE
-
Sometimes
the
color
of
en
installed
wire
may
be
differ-
ent
than
the
one
on
the
wiring
diagram
.
Don't
be
con-
cerned
.
Just
be
sure
lo
confirm
that
the
wire
connects
lo
the
proper
terminals
.
Wire
color
codes
"
BLU
.........
.
..
..
...
.
.................
Blue
"
BRN
....:....
.
..
..
...
..
...............
Brown
"
YEL
.........
.
..
..
...................
.Yellow
"
GRN
.........
.
..
..
...
.
................
creen
"
G
RY
.......
.
.
.
..
..
.....................
G
ray
"
ORG
.........
.
..
..
...
.
..............
.Orange
"
RED
......
...
.
.
..
.....................
.Red
"
BLK
.........
.
..
..
...
.
................
Black
"
VIO
..........
.
..
...
..
..
.......
.
.......
Violet
"
WHT
.........
.
.
....
.
...
:..............
White
Table
a
.
Terminal
and
Circuit
Numbers
Number
1
Circuít
description
1
j
Low
voltage
switched
terminal
of
coi¡
4
1
High
voltage
center
termina¡
of
coi¡
+x
Originates
atignition
switch
.
Supplies
powerwhen
the
ignition
switch
is
in
the
PARK,
RUN,
or
START
position
15
Originates
atignition
switch
.
Supplies
powerwhen
ignition
switch
is
in
RUN
or
START
position
30
Battery
positive
(+)
voltage
.
Supplies
power
whenever
battery
is
connected
.
(Not
dependent
on
ignition
switch
position,
unfused)
31
1
Ground,
battery
negative
(-)
terminal
50
Supplies
power
from
battery
to
starter
solenoid
when
ignition
switch
isin
START
position
only
+54
Originates
atignition
switch
.
Supplies
power
when
ignition
switch
isin
the
RUN
position
only
85
1
Ground
side
(-)
ofrelay
coil
86
1
Power-in
side
(+)
ofrelay
coil
87
1
Relay
actuatedcontact
D
Alternator
warning
light
and
field
energizing
circuit
ELECTRICAL
SYSTEM-GENERAL
600-
3
Additional
abbreviations
shown
in
the
wiring
diagrams
are
given
below
.
Abbreviations
"
ABS
........
.
...
.
...
.
..........
antilock
brakes
"
A/C
........
.
...
..
..
.
.........
.airconditioning
"
AST/ASC+T
.......
...
.
.
.......
al¡
season
traction
"
CONV
.......
.
.
...
.................
convertible
"
DME
........
.
.
...
.......
digital
motor
electronics
"
ECM
.......
.
...
..
..
.
..
electronic
control
module
"
EWS/EWS
II
......
...
.
.
coded
driveaway
protection
"
SRS
........
.
supplemental
restraint
system-airbag
"
TCM
........
.
..
....
.
transmission
control
module
"
ZKE
(94-98
models)
..
..
.
...
central
body
electronics
"
ZVM
(92-93
models)
...
.
.
..
.
.......
central
locking
ELECTRICAL
TROUBLESHOOTING
Most
terminals
are
identified
by
numbers
on
the
compo-
nents
and
harness
connectors
.
The
terminal
numbers
for
ma-
Four
things
are
required
for
current
toflow
in
any
electrical
jor
electrical
connections
are
shown
in
the
diagrams
.
Though
circuit
:
a
voltagesource,
wires
or
connections
to
transport
the
many
terminal
numbers
appear
only
once,
severa¡other
num-
voltage,
a
load
or
device
that
uses
the
electricity,
and
a
con-
bers
appear
in
numerous
places
throughout
the
electrical
sys-
nection
to
ground
.
Most
problemscanbefound
using
a
digital
tem
and
identify
certain
types
ofcircuits
.
Some
of
the
most
multimeter
(volt/ohm/amp
meter)to
check
for
voltage
supply,
common
circuit
numbers
are
listed
below
in
Table
a
.
for
breaks
in
the
wiring
(infinite
resistance/no
continuity),
orfor
a
path
to
ground
that
completesthe
circuit
.
Electric
current
is
logical
in
its
flow,
always
moving
from
the
voltage
sourcetoward
ground
.
Electricalfaults
can
usually
be
located
through
a
process
of
elimination
.
When
troubleshoot-
ing
a
complex
circuit,
separate
the
circuit
into
smaller
parts
.
The
general
testsoutlined
below
may
be
helpful
in
finding
electrical
problems
.
The
information
is
most
helpful
when
used
with
the
wiring
diagrams
.
Be
sure
to
analyze
the
problem
.
Use
the
wiring
diagrams
to
determine
the
most
likely
cause
.
Getan
understanding
of
how
the
circuit
works
by
following
the
circuit
from
groundback
to
the
power
source
.
When
making
test
connections
at
connectors
andcompo-
nents,
use
care
to
avoidspreading
or
damaging
the
connec-
tors
or
terminals
.
Some
tests
may
require
jumper
wires
to
bypass
components
or
connections
in
the
wiring
harness
.
When
connecting
jumper
wires,
use
bladeconnectors
at
the
wire
ends
that
match
the
size
of
the
terminal
being
tested
.
The
small
interna¡
contacts
are
easily
spread
apart,
and
this
can
cause
intermittent
or
faultyconnections
that
can
leadto
more
problems
.
ELECTRICAL
TROUBLESHOOTING
Page 632 of 759
4C
WHO/GRN
B
RED/
GRV/VEL
HORNRELAV
LOW-NOISE
MICROPHONE
63688
6
RED/GRV/YEL
NCA
C
1A
11
RED
NCA
2
V10/
BRN
33
BRN
N`
C
fA
4
BRN
NCA
5
BRNISLU/EL
NCA
7
BLK/
NCA
Be
BLU
l
BL
U
11
BRN/WH
NCA
12
BRN
02
VIOIGRNIVEL
HOTATA
T
LLTIMES
HOT
IN
ACCY
.
RUNAND
START
r
`FUSE,AUXILIARVFUSEBOX
r
PUBS,
PRONTPOWER
F47
I
I
F43
I
DISTRIBUTION
BOX
I
T
15A
I
I
5A
I
L
__J
2s
25D
26
XIDD]B
RE
RY/
viol
V
EL
WHT
RED/GRV/I
VIOII
VEL
WHT
ELECTRICAL
WIRING
DIAGRAMS
ELE-149
Anti-Theft
1995-97
318ti
Alpine
System
BRN/GRV/I
BRN/BLU/
YEL
VEL
W/CCM
1
W/OOCM
BLK/
BLU
t11
1
G400
G400
G203
G203
VIO/GEN/
VEL
BLUeL1IGENIYEL2
l1
-1
CRASH
CONTROL
MODULE
SRNIREDIVEL
1
BEN/GRV/
-
YEL
2
I
BRN/BLU/=_3
I
I
X]~254
I
I
I
I
WHTWRT/I
I
VIOIGRN/I
I
X~-D~s2
L
-
_
I
BODY
ELECTRON
CS
CONTROL
MODULE
(ZKE
IV)
VIOIGRN/~
1
I
ON-BOARDCOMPUTER
Page 646 of 759
GRN/BLU
GRN/BLU
j
4
IRKS
CONTROL
SWITCH
I
---
.
_
.
.G201
10
BRN/EL
ITEG
RATEDHEATIN(
E
MATECONTROL
---I
BLUE
I
4
BRN/WHT
HEATING
CONTROL
I
I
REAR
DEFOGGER
G201
SWITCH
104767
AUTOMATIC
CLIMATE
CONTROL
MODULE
I
I~
12
BRN/VEL
THERMOSTAT
I~
4
BRN/WHT
I
--
I'
ANTENNA
AMPLIFIER
I
__I
HIFIAMPLIFIER
104762
Rear
Window
Defogger
X
1943
)1
BRN
~
XLS93
+
G404
2
BLK
X1645
1
VEL/BLU
NC
A
A
=
A,f
NCA
NCA~
f
NCA
NCA~
E
NCA
NCA~
E
NCA
NCA
_NCA_NCA
NCA
DIVERSITY
(W/3
ANTENNA
DIVERSITY)
1
}
NC
I
r
N
.A
I
II
I
16
WHT
RADIO
I
2
WHT
H
ELECTRICAL
WIRING
DIAGRAMS
ELE-163
CLIMATECONTROL
HOTINSUNANDSTART
HOTATALLTIMES
r
,
TFUSE
FUSE
,FRONTPOWER
F23
FB
DISTRIBUTION
BOX
5
A____---
3
0
-J
WIAUTOMATIC
I?
S
CLIMATE
CONTROL
E
BLU/BLK
9Y
2
BLKW/OAUTOMATIC
-
-
REARDEFOGGER
RELAY
REARDEFOGGER/
ANTENNA
2
BLK
W/
I
W/0
AE
RIAL
AERI
AL
BLKI
BLKJREAR
DEFOGGER
BRNI
1
3404
X380
BLK
1
X379
EL/BLU
1~2
VEL/GRN
VEL/GRN
2'
I
~3
WH
II
'
~~II
IT
X1947
1
X
1949
REAR
ANTENNA
DEFOGGER
AMPLIFIER
I
I
__I
2
WH
O
T
WHT
3
i
--I
HIFIAMPLIFIER
SUBWOOFER
HOTINRUNANDSTART
HOTATALLTIMES
rF
-
SE
TFUSE
,FRONTPOWER
I
F23
F6
IDISTRIBUTIONBOX
I_,1SA--_-----
;
30A
J
67X14
GRN/BLU
GRN/BLU
I
RED/BRN
4
REAR
DEFOGGER
RELAY
I
BRNI
I
G312
1G310
(2
DOOR)
(4DOOR)
1998
318ti
1998
Except
318ti
&
Convertible