1996 SUBARU LEGACY check engine

SUPPLEMENTAL
RESTRAINT
SYSTEM
(ELECTRIC
SENSOR
TYPE)
[T5H11
5-5b

5
.
Diagnostics
Chart
with
Trouble
Code

H
:
TROUBLE
CODE
31

DIAGNOSIS
:

"
Airbag
control
module
is
faulty
.

"
Airbag
main
harness
circuit
is
open
.

"
Fuse
No
.
16
is
blown
.

"
Body
harness
circuit
is
open
.

1
1
.
Airbag
control
module
inspection

1
2
.
Airbag
main
harness
Inspection

1
3
.
Fuse
No
.
16
inspection

CAUTION
:

Before
performing
diagnostics
on
airbag
system,
turn

ignition
switch
"OFF",
disconnect
battery
ground
cable

and
then
wait
at
least
20
seconds
.

After
20
seconds
elapse,
remove
instrument
panel
lower
cover,
and
disconnect
(AB3)
and
(AB8),
(AB9)
and

(AB10)
.

1
.
AIRBAG
CONTROL
MODULE
INSPECTION

1)
Disconnect
connector
(AB6)
fromairbag
control
mod-

ule
<
Ref
.
to
5-5
[W6A0].*2
>,
and
connect
it
to
test
har-

ness
B2
connector
(8B)
.

2)
Connect
battery
ground
cable
and
turn
ignition
switch

"ON"
(engine
off)
.

3)
Measure
voltage
across
connector
(5B)
terminal
and

chassis
ground
.

CHECK
:
Connector
&
terminal

(5B)
No
.
5
(+)
-
Chassis
ground
(
)
:

Is
voltage
more
than10
V?

Replace
airbag
control
module
.

No
:
Go
to
step
2
.

25

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

5
.
Diagnostics
Chart
with
Trouble
Code

J
:
TROUBLE
CODE
34

DIAGNOSIS
:

9
Airbag
main
harness
circuit
(Passenger)
is
shorted
to

power
supply
.

*Airbag
module
harness
(Passenger)
is
shorted
to
power

supply
.

9
Airbag
control
module
is
faulty
.

r
1
.
Airbag
main
harness
inspection
l

CAUTION
:

Before
performing
diagnostics
on
airbag
system,
turn

ignition
switch
"OFF",
disconnect
battery
ground
termi-

nal
and
thenwait
at
least
20
seconds
.

After
20
seconds
elapse,
remove
instrumentpanel
lower
cover,
and
disconnect
(AB3)
and
(AB8),
(AB9)
and

(AB10)
.

1
.
AIRBAG
MAIN
HARNESS
INSPECTION

1)
Disconnect
connector
(AB6)
from
airbag
control
mod-

ule
<
Ref
.
to
5-5
[W6A0].*2
>,
and
connect
it
totest
har-

ness
132
connector
(8B)
.

2)
Connect
battery
ground
cable
and
turn
ignition
switch

"ON"
(engine
off)
.

3)
Measure
voltage
across
each
test
harness
132
connec-

tor
(5B)
terminal
and
chassis
ground
.

CHECK
:
Connector
&
terminal

(5B)
No
.
6
(+)
-
Chassis
ground
(
)
:

Is
voltage
less
than
1
V?

ves
:
Go
to
next
CHECK

No
:
Replace
airbag
main
harness
.

CHECK
;
Connector
&
terminal

(5B)
No
.
7
(+)
-
Chassis
ground
(
)
:

Is
voltage
less
than
1
V?

,rES
:
Replace
airbag
control
module
.

No
:
Replace
airbag
main
harness
.

28

SUPPLEMENTAL
RESTRAINT
SYSTEM
(ELECTRIC
SENSOR
TYPE)
[T5M1]
5-5b

5
.
Diagnostics
Chart
with
Trouble
Code

1.
Airbag
main
harness
Inspection

M
:
TROUBLE
CODE
43

DIAGNOSIS
:

*
Airbag
main
harness
circuit
(Driver)
is
shorted
to
power

supply
.

Airbag
module
harness
(Driver)
is
shorted
to
power

supply
.

"
Roll
connector
is
shorted
to
power
supply
.

"
Airbag
control
module
is
faulty
.

CAUTION
:

Before
performing
diagnostics
on
airbag
system,
turn

ignition
switch
"OFF",
disconnect
battery
ground
termi-

nal
and
thenwait
at
least
20
seconds
.

After
20
seconds
elapse,
remove
instrument
panel
lower
cover,
and
disconnect
(AB3)
and
(AB8),
(AB9)
and

(AB10)
.

1
.
AIRBAG
MAIN
HARNESS
INSPECTION

1)
Disconnect
connector
(AB6)from
airbag
control
mod-

ule
<
Ref
.
to
5-5
[W6A0]
.*2>,
and
connect
it
to
test
har-

ness
132
connector
(8B)
.

2)
Connect
battery
ground
cable
and
turn
ignition
switch

"ON"
(engine
off)
.

3)
Measure
voltage
across
each
test
harness
132
connec-

tor
(5B)terminal
and
chassis
ground
.

CHECK
:
Connector
&
terminal

(5B)
No
.
1
(+)
-
Chassis
ground
(
)
:

Is
voltage
less
than
1
V?

YES
.
G
o
tonext
CHECK

No
:
Replace
airbag
main
harness
.

CHECK
:
Connector&
terminal

(58)
No
.
14
(+)
-
Chassis
ground
(-)
:

Is
voltage
less
than
1
V?

vES
:
Replace
airbag
control
module
.

No
:
Replace
airbag
main
harness
.

31

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