1996 SUBARU LEGACY check engine light

5-5b
[TaAO]
SUPPLEMENTAL
RESTRAINT
SYSTEM
(ELECTRIC
SENSOR
TYPE)

4
.
Diagnostics
Chart
for
On-board
Diagnostic
System

4
.
Diagnostics
Chart
for
On-board

Diagnostic
System

A
:
BASIC
DIAGNOSTICS
PROCEDURE

1)
Airbag
warning
light
comes
"ON"
.

2)
Turn
ignition
switch
to
"ON",
(engine
"OFF")
and
observe
airbag
warning
light
.

3)
If
airbag
warning
light
stays
"ON"
after
8
seconds
or
remains
"OFF",
or
comes
back
"ON"
after
30
seconds,
this
indicates

a
current
problem
.
Proceed
to
step
8)
.

If
airbag
warning
light
comes
"ON"
for
8
seconds,
then
goes
out
and
stays
out,
this
indicates
normalsystem
operation
atthis

time
.
Check
the
memory
for
intermittent
problems
by
performing
the
procedure
outlined
in
[T4B0)tr2
"ON-BOARD

DIAGNOSTICS"
.
Proceed
to
step
4)
.

4)
If
trouble
code
indicated,
<
Ref
.
to
[T4D1]*2
-
[T4D2]
.*2>
proceed
to
step
5)
.

If
normal
code
indicated,
<
Ref
.
to
[T4D2]
.
>
proceed
to
step
6)
.

5)
Repairand
replacement,
<
Ref
.
to
[T5P1]
.*2>
proceed
to
step
7)
.

6)
Repair
and
replacement,
<
Ref
.
to
[T5Q1]
.*2>
proceed
to
step
7)
.

7)
Turn
ignition
switch
"ON",
(engine
"OFF")
and
observe
airbag
warning
light
.
If
airbag
warning
light
stays
"ON"
after
8

seconds
or
comes
back
"ON"
after
30
seconds,
proceed
to
step
8)
.

If
airbag
warning
light
comes
"ON"
for
8
seconds,
then
goes
out
and
stays
out,
proceed
to
step
9)
.

8)
Repair
and
replacement
.
<
Ref
.
to
[T4E1]
.*2>
Proceed
to
step
10)
.

9)
Clear
memory
.
<
Ref
.
to
[T4C0]
.z`r2>
Proceed
to
step
10)
.

10)
END

SUPPLEMENTAL
RESTRAINT
SYSTEM
(ELECTRIC
SENSOR
TYPE)
[T4CO]
5-5b

4
.
Diagnostics
Chart
for
On-board
Diagnostic
System

2

L3141
B5mol
15B

2

33

E
;1
1~3141516
B5M01
16B

B
:
ON-BOARD
DIAGNOSTIC

When
the
airbag
system
isin
functioning
condition,
the

airbag
warning
light
will
remain
on
for
8
seconds
and
go

out
when
the
ignition
switch
is
set
to
ON
.

If
there
is
any
malfunction,
the
airbag
warning
light
will

either
stay
on
or
off
continuously
.
In
such
cases,
perform

on-board
diagnostic
in
accordance
with
the
specified
pro-

cedure
to
determine
trouble
codes
.

1)
Turn
ignition
switch
ON
(with
engine
OFF)
.

2)
ConnectDIAG
.
terminal
T
to
No
.
1
terminal
of
diag-
nosis
connector
~2
located
below
lower
cover
.

3)
Check
in
accordance
with
the
trouble
code
indicated

by
the
AIRBAG
warning
light,
and
record
the
trouble

codes
.

4)
Turn
the
ignition
switch
"OFF"
and
remove
the
DIAL
.

terminal
from
No
.1
terminal
of
diagnosis
connector
.

C
:
CLEAR
MEMORY

After
eliminating
problem
as
per
trouble
code,
clear
mem-

oryas
follows
:

Make
sure
ignition
switch
is
ON
(and
engine
off)
.
Connect

one
DIAL
.
terminal
1Q
on
diagnosis
connector
(Z
termi-
nal
No
.
1
.

While
warning
light
is
flashing,
connect
the
other
DIAL
.

terminal
(Z
on
terminal
No
.
2
for
at
least
three
seconds
.

After
memory
is
cleared,
normal
warning
light
flashing
rate

resumes
.
(Warning
light
flashes
every
0
.6
seconds

ON-OFF
operation
.)
Memory
cannotbe
cleared
if
any

problem
exists
.

After
clear
memory
and
then
DIAG
.
terminals
(1)
and
(3),

extract
from
diagnosis
connector
02
.

9

SUPPLEMENTAL
RESTRAINT
SYSTEM
(ELECTRIC
SENSOR
TYPE)
[T5N2]
5-5b

5
.
Diagnostics
Chart
with
Trouble
Code

B31
1A

5A
r
.~
..

,fl((
i

1
23
45B
7
89
101
.112131415
761718
I

B5M0123B

i

1
2
31
5
8789
[
lo
l
l1
1
12
1
13
1
14
1
15
1
16
1
17
1
.
t18
20

i

G5M0559
I

2
.
INSPECTION
OF
BODY
HARNESS,
CONNECTOR

AND
AIRBAG
WARNING
LIGHT

1)
Turn
ignition
switch
"OFF"
and
connect
body
harness

connector
(B31)
to
test
connector
A
connector
(1A)
.

2)
Connect
battery
ground
cable
and
turn
ignition
switch

"ON",
(engine
off)
and
connect
connectors
(3A)
and
(4A)
.

CHECK
;
Does
the
airbag
warning
light
come
off?

,rES
:
Go
tostep
3)
.

Go
tonext
~
.

~K
:
Is
there
anything
unusual
to
body
harness?

Repair
body
harness
.

Replace
airbag
warning
light
module
1~
.

NOTE
:

After
problem
has
been
eliminated,
disconnect
connectors

(3A)
and
(4A)
.

3)
Turn
ignition
switch
"OFF",
disconnect
battery
ground

cable
and
then
wait
at
least
20
seconds,
and
re-connect

connectors
(AB1)
and
(B31)
.

4)
Remove
instrument
panel
lower
cover
and
disconnect

(AB3)
with
(AB8),
then
disconnect
connector
(AB6)from

airbag
control
module,
<
Ref
.
to
5-5
[W6A0]
.*2
>
and

connect
it
to
test
harness
132
connector
(8B)
.

5)
Connect
battery
ground
cable
and
turn
ignition
switch

"ON,"
(engine
off)
and
connect
connectors
(6B)
and
(7B)
.

CHECK
:
Does
the
airbag
warning
light
come
on?

0
:
Go
to
step
3
.

No
:
Replace
airbag
main
harness
.

NOTE
:

After
problem
has
been
eliminated,
disconnect
connectors

(6B)
and
(7B)
.

33

SUPPLEMENTAL
RESTRAINT
SYSTEM
(ELECTRIC
SENSOR
TYPE)
[T502]
5-5b

5
.
Diagnostics
Chart
with
Trouble
Code

O
:
AIRBAG
WARNING
LIGHT
REMAINSOFF
.

DIAGNOSIS
:

"
Fuse
No
.
15
is
blown
.

"
Body
harness
circuit
is
open
.

"Airbag
warning
light
is
faulty
.

"
Airbag
main
harness
is
faulty
.

"Airbag
control
module
is
faulty
.

1
1
.
Fuse
No
.
15inspection

1
2
.
Body
harness
inspection

3
.
Airbag
warning
light
module
(in
combination

meter)
inspection

1
4
.
Airbag
main
harness
Inspection

CAUTION
:

Before
performing
diagnostics
on
airbag
system,
turn

ignition
switch
"OFF",
disconnect
battery
ground

terminal,
and
then
wait
at
least
20
seconds
.

1
.
FUSE
No
.
15
INSPECTION

Remove
and
visually
check
fuse
No
.
15
.

CHECK
;
Is
fuse
No
.
15
blown?

(]
ES
:
Replace
fuse
No
.
15
.

If
fuse
No
.
15
blows
again,
go
to
step
2
.

No
:
Go
to
step
2
.

2
.
BODY
HARNESS
INSPECTION

Turn
ignition
switch
"ON"
(engine
off)
to
make
sure
other

warning
lights
(in
combination
meter)
illuminate
.

CHECK
:
Do
all
the
warning
lights
(in
combination

meter)
except
airbag
warning
light
come
on?

vES
:
Go
to
step
3
.

No
:
Repair
body
harness
.

35

5-5b
(T503]
SUPPLEMENTAL
RESTRAINT
SYSTEM
(ELECTRIC
SENSOR
TYPE)

5
.
Diagnostics
Chart
with
Trouble
Code

B31

AB1

r
`,~~,
;
r
:cr

B5M01228

0)0
0

J
J

AB

B8

.
.o/

G5M0312

3
.
AIRBAG
WARNING
LIGHT
MODULE
(IN

COMBINATION
METER)
INSPECTION

1)
Turn
ignition
switch
"OFF",
disconnect
battery
ground

cable
and
then
wait
at
least
20
seconds
.

2)
Disconnect
body
harness
connector
(B31)
fromcon-

nector
(AB1),

3)
Connect
battery
ground
cable
and
turn
ignition
switch

"ON"
(engine
off)
to
make
sure
airbag
warning
light
illu-

minates
.

CHECK
:
Does
the
airbag
warning
light
come
on?

vss
:
Go
to
step
4
.

Replace
airbag
warning
light
module

4
.
AIRBAG
MAIN
HARNESS
INSPECTION

1)
Turn
ignition
switch
"OFF",
disconnect
battery
ground

cable
and
then
wait
atleast
20
seconds
.

2)
Connect
body
harness
connector
(B31)
and
connector

(AB1)
.

3)
Disconnect
connectors
(AB3)
and
(AB8)
below
steering

column
.
<
Ref
.
to
5-5[M2-6]
.*1
>

4)
Disconnect
connector
(AB6)
from
airbag
control
mod-

ule
.
<
Ref
.
to
5-5
[W6A0]
.*2
>

5)
Connect
battery
ground
cable
and
turn
ignition
switch

"ON"
to
make
sure
airbag
warning
light
illuminates
.

CHECK
:
Does
the
airbag
warning
light
come
on?

Replace
airbag
control
module
.

No
:
Replace
airbag
main
harness
.

36

SUPPLEMENTAL
RESTRAINT
SYSTEM
(ELECTRIC
SENSOR
TYPE)
[T5G17]
5-5b

5
.
Diagnostics
Chart
with
Trouble
Code

v
0
v

GSM0461

5
.
FUSENo
.
16,
AIRBAG
MAINHARNESS,
BODY

HARNESS
VIBRATION
INSPECTION

Conduct
vibration
inspection
on
fuse
No
.
16,
airbag
main

harness
and
body
harness
.

CAUTION
:

Do
not
shake
or
vibrate
airbag
control
module
.

CHECK
:
Do
fuse
No
.
16,
airbag
main
harness
or
body

harness
malfunction
again
when
shaking?

Replace
faulty
airbag
component
parts
.

No
:
Go
to
step
6
.

NOTE
:

Gently
shake
each
part
.

6
.
SHOWERING
INSPECTION
TO
BODY

Spray
water
on
vehicle
body
.

CAUTION
:

Do
not
directly
spraywater
on
each
part
.

CHECK
:
Does
wafer
leak
into
the
passenger
compart-

ment
when
showering
vehicle?

,res
:
Replace
faulty
airbag
component
parts
.

No
:
Go
to
step
7
.

NOTE
:

If
leaks
are
noted,
check
wiring
harnesses
as
water
may

leak
along
them
and
get
parts
wet
.

7
.
WARNING
LIGHT
ILLUMINATION
CHECK

Turn
ignition
switch
"ON"
(engine
off)
and
observe
airbag

warning
light
.

CHECK
:
Does
the
airbag
warning
light
comes
on
for
8

seconds,then
go
out
and
stay
out?

,rES
:
Clear
memory
.

Go
to
[T4E0]*2
"DIAGNOSTICS
PROCEDURE"
.

43

s-$
[D601]
WIRING
DIAGRAM

6
.
Wiring
Diagram

No
.
Load

MB-2
Powerwindow
circuit
breaker

Engine
control
module

Fuel
pump
relay
MB-3
Main
relay

OBD-II
service
connector

MB-4A/C
relay
holder

MB-6
Headlight
LH

Diode
(Lighting)

Lighting
switch

Combination
meter
M
B_$

Headlight
RH

Combination
meter

Door
lock
timer

MB-9
Luggage
room
light

Radio

Room
light

MB-10
A/C
relay
holder

ALT-1
Combination
meter

IG
A/C
relay
holder

Cruise
control
module

ST
Engine
control
module

Inhibitor
switch

FB-2
Diode
(A/C)

Sub
fan
motor
FB-3
Sub
fan
relay-2

Engine
control
module

Fuel
pump
relay
FB-4
Ignition
coil

Transmission
control
module

Side
marker
light
LH
FB-6
Side
marker
light
RH

FB-7Door
lock
timer

FB-9Hazard
switch

AT
shift
lock
control
module
FB-10
Key
warning
switch

Power
antenna

FB-11
Radio

FB-12
Cigarette
lighter

FB-13
Remote
control
rearview
mirrorswitch

AT
shift
lock
control
module

Combination
switch
Front
washer
motor
FB-14
Front
wipermotor

Rear
washer
motor

Rear
wipermotor

Rear
wiper
relay

FB-15Transmission
control
module

Na
Load

Rear
defogger

FB-16
Rear
defogger
condenser

Reardefogger
switch

FB-17
Rear
defogger
switch

FB-18
AT
shift
lock
control
module

Inhibitor
switch

FB-19
Hazard
switch

Combination
meter
FB-20
Mode
control
panel
FB-21
Combination
meter
(Airbag)

Blower
motor
relay

Check
connector

FB-22
FRESH/RECIRC
actuator

Mode
actuator

Powerwindow
relay

Seat
belt
timer

FB-23
Airbag
.
control
module

FB-24
Airbag
control
module

FB-25
Lighting
switch

FB-26
Parking
switch

FB-27
Parking
switch

FB-28
Illumination
light

FB-29
Illumination
light

FB-30
Stop
light
switch

Stop
&
brake
switch

FB-31
Horn
relay

FB-32
Blower
motor
relay

FB-33
Parking
switch

License
plate
light
LH

License
plate
light
RH

FB-34
Rear
combination
light
LH

Rear
combination
light
RH

Rear
finisher
light
LH

Rear
finisher
light
RH

FB-35
Cruise
control
main
switch
Cruise
control
module

6-3
[Dso131
WIRING
DIAGRAM

6
.
Wiring
Diagram

Combination
meter

Tachometer
i10
:a

-

110
OD
:
b

Malfunction
i14
I:
c
indicator
~}g
lamp

Speedometer
circuit

ill

Main
relay
o
B47
Twisted
wire

0

B46
E
Fuel
pump
relay

13
.
ENGINE
ELECTRICAL
SYSTEM

To
Power
Supply
Routing
FB-20
~
MB-3
~
FB-4
~
ST
FB-22
Check

FUSENa
15
SBF-2
FUSE
Na
l6IGSW
FUSE
W
15
connector
a
v
B79

,~l,,I
F45

u
B62(2
837

i3
B3B

S
.
M
.
J
.
[Referto
foldout
page
.]

R58R57Rt5

Fuel
M
Y

pump

E
Inhibitor
switch

Bl2
B97817

RI

Vehicle
speed
sensor
2

B17
(B
I
ac
k)
i
tl
B46
(Green)
R15
(B
I
ac
k)
R58

12
1
2
123
12
12334
3456
456

(
2D
(Light
gray)
110
i
l2
(L
I
ght
gray)

1
1
1
2
1
3
1
4
1
5
1
6
M78
9
1
10
1
11
1
12
1
D
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Enginecontro
I
B84
module

B47
(Brown)
(g
)(Gray)

1
2
1
23
4
31
45
67
85
1
69
1
16N1
1
12
1
-

(
ED

B79
(Gray)

1
23
4567
89
1
10
1112
1314

t2(3
(B
rown)

234789
12345
678910
l
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1
11
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BUR10-02A

12