ignition SUBARU LEGACY 1996 Service Owner's Guide

ON-BOARD
DIAGNOSTICS
II
SYSTEM
[T»BGO]
2-7

11
.
Diagnostics
Chart
with
Trouble
Code

BG
:
DTC
P1500

-
RADIATOR
FANRELAY
1
CIRCUIT

MALFUNCTION
(FAN
-1)
-

WIRING
DIAGRAM
:

Ignition
switch
~-1

Sub
fanrelay
1

A/C
relay
holder

B71FTIF28
O
O
F31
a
:
F10
e
:
B52

42
C12
32
344
32
62841D
X29
0116

Fl3
F45

34
1
2
3
~
1111131
1516171819
O~~I

u
112
1
L1
1
3
1
4
1
U
56
U
78

11
15
1

82M0799

NOTE
:

For
the
diagnostic
procedure
on
radiator
fan
relay
1
cir-

cuit
malfunction
(DTC
P1500),
referto
2-7
[T10B10]*2
.

125

2-7
[T11BH0]
ON-BOARD
DIAGNOSTICS
II
SYSTEM

11
.
Diagnostics
Chart
with
Trouble
Code

BH
:
DTC
P1502

-
RADIATOR
FAN
FUNCTION
PROBLEM

(FAN
-
F)
-

Ignition
switch
C

B72

Sub
fanrelay
t

rn

a
:
F~0

b
:
F~1

e
:O

Main
fan
motor

f17

motor

f16

WIRING
DIAGRAM
:

FL1
.258

58F-4

O
No
.
t
-
FMF~
F45862
O

ECM
21

F21
J
u
l
F28
J
u
l
O
~
O

U
IJ
boW
booms
booms

20A10A
Main
fan
Main
fan
Sub
fan
relay
1
relay
2
relay
2

A/C
relay
holder

e
:
F40
b
:
f41
e
:
(@)

F
1
2
345
&N
rQ3
MZMNTM
F7281
9
110

(9)
QD
(~D
(~D(~D
(N)Q~D
0~~)
(D
1
2u34
!J
56
u
78
u

123
3
~
123
~1
4
1~12121~
0
1

82M0800

NOTE
:

Forthe
diagnostic
procedure
on
radiator
fan
function

problem
(DTC
P1502),
referto
2-7
[T10BJ0]*2
.

126

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

5-5b
[TaE1)
SUPPLEMENTAL
RESTRAINT
SYSTEM
(ELECTRIC
SENSOR
TYPE)

4
.
DiagnosticsChart
for
On-board
Diagnostic
System

E
:
DIAGNOSTICS
PROCEDURE

1
.
AIRBAG
WARNING
LIGHT
STAYS
ON
AFTER
8

SECONDS
.

1)
Perform
on-board
diagnostic
.
<
Ref
.
to
5-5
[T4130]
.

*2>

2)
Are
trouble
codes
4,
12,
13,
22,
34,
41,
42
or
43
indi-

cated?
<
Ref
.
to
5-5
[T4D1
]*2-[T4D2]
.*2
>

Record
trouble
codes
.
If
"YES"
proceed
to
step
4)
.
If
"NO"

proceed
to
step
3)
.

3)
Proceed
with
diagnostics
and
repair
according
to
trou-

ble
code
indicated
then
perform
step
15)
.

4)
If
codes
4,
22,34,
42are
indicated,
proceed
tostep
5)
.

If
codes
4,
22,
34,
42
arenot
indicated,
proceed
to
step
10)
.

5)
If
codes
12,
13,
41,
43
are
indicated,
proceed
tostep
6)
.

If
codes
12,13,41,
43are
not
indicated,
proceed
to
step

11)
.

6)
Turn
ignition
switch
"OFF",
disconnect
battery
ground

cable,
and
wait
20
seconds
.
Disconnect
passenger
side

airbag
module
connector
(AB9)
to
(AB10)
.
<
Ref
.
to
5-5

[W3A2]
.*1
>
Connect
test
harness
C
connector
(1
C)
to

(AB9)
.

Connect
airbag
resistorto
test
harness
C
connector
(3C)
.

Remove
lower
coverpanel
and
connect
test
harness
C

connector
(1C)
to
(AB8)
<
Ref
.
to
5-4
[W1A0)
.*1
>
with

airbag
resistor
attached
to
test
harness
C
connector
(3C)
.

Connect
battery
ground
cable
and
turn
ignition
switch

"ON"
.
Does
airbag
warning
light
go
"OFF"
after
8
seconds

and
remain
off
for
more
than
30
seconds?

See
"NOTE
:"
.

If
"YES"
proceed
tostep
7)
.

If
"NO"
proceed
tostep
3)
.

7)
Turn
ignition
switch
"OFF",
disconnect
battery
ground

cable,
and
wait
20
seconds
.
Connect
passenger
side
air-

bagmodule
connector
(AB9)
to
(AB10)
.
Connect
battery

ground
cable
and
turn
ignition
switch
"ON"
.
Does
airbag

warning
light
go
"OFF"
after
8
seconds
and
remain
offfor

more
than
30
seconds?

See
"NOTE
:"
.

If
"YES"
proceed
to
step
8)
.

If
"NO"
proceed
tostep
13)
.

12

SUPPLEMENTAL
RESTRAINT
SYSTEM
(ELECTRIC
SENSOR
TYPE)
[T4E1]
5-5b

4
.
Diagnostics
Chart
for
On-board
Diagnostic
System

8)
Turn
ignition
switch
"OFF",
disconnect
battery
ground

cable,
and
wait
20
seconds
.
Connect
connector
(A138)to

(AB3)
.
Remove
driver
side
airbag
moduleand
connect
test

harness
C
connector
(1C)
to
(AB7)
.
<
Ref
.
to
5-5

[W3A1]
.*1
>

Connect
airbag
resistorto
test
harness
C
connector
(3C)
.

Connect
battery
ground
cable
and
turn
ignition
switch

"ON"
.
Does
airbag
warning
light
go
"OFF"
after
8
seconds

and
remain
off
for
more
than
30seconds?

See
"NOTE
:"
.

If
"YES"
proceed
to
step
9)
.

If
"NO"
proceed
to
step
14)
.

9)
Turn
ignition
switch
"OFF",
disconnect
battery
ground

cable,
and
wait
20
seconds
.
Replace
with
a
new
driver
side

airbag
module
.
<
Ref
.
to
5-5
[W3A1
]
.*1
>
Proceed
tostep

15)
.

10)
Turn
ignition
switch
"OFF",
disconnect
battery

ground
cable,
and
wait
20
seconds
.
Remove
lower
cover

panel
and
connect
test
harness
C
connector
(1C)
to
(AB8)

<
Ref
.
to
5-4
[W1A0]
.*1
>
with
airbag
resistor
attached
to
test
harness
C
connector
(3C)
.

Connect
battery
ground
cable
and
turn
ignition
switch

"ON"
.
Does
airbag
warning
light
go
"OFF"
after
8
seconds

and
remain
off
for
more
than30
seconds?

See
"NOTE
:"
.

If
"YES"
proceed
to
step
8)
.

If
"NO"
proceed
to
step
3)
.

13

5-5b
[T4Ey]
SUPPLEMENTAL
RESTRAINT
SYSTEM
(ELECTRIC
SENSOR
TYPE)
4
.
Diagnostics
Chart
for
On-board
Diagnostic
System

11)
Turn
ignition
switch
"OFF",
disconnect
battery

ground
cable,
and
wait
20
seconds
.
Disconnect
passen-

ger
side
airbag
module
connector
(AB9)
to
(AB10)
.
<
Ref
.

to
5-5
[W3A2]
.*1
>

Connect
test
harness
C
connector
(1C)
to
(AB9)
.
Connect

airbag
resistorto
test
harness
C
connector
(3C)
.

Connect
battery
ground
cable
and
turn
ignition
switch

"ON"
.
Does
airbag
warning
light
go
"OFF"
after
8
seconds

and
remain
off
for
more
than30
seconds?

See
"NOTE
:"
.

If
"YES"
proceed
to
step
12)
.

If
"NO"
proceed
to
step
3)
.

12)
Turn
ignition
switch
"OFF",
disconnect
battery

ground
cable,
and
wait
20
seconds
.
Replace
with
a
new

passenger
side
airbag
module
<
Ref
.
to
5-5
[W3A2]
.*1
>

then
proceed
to
step
15)
.

13)
Turn
ignition
switch
"OFF",
disconnect
battery

ground
cable
and
wait
20
seconds
.
Replace
with
a
new

passenger
side
airbag
module
<
Ref
.
to
5-5
[W3A2]
.*1
>

then
proceed
to
step
7)
.

14)
Turn
ignition
switch
"OFF",
disconnect
battery

ground
cable,
and
wait
20
seconds
.
Replace
with
a
new

combination
switch,
<
Ref
.
to
5-5
[W7A0]
.*2
>
and
install

driver
side
airbag
module
<
Ref
.
to
5-5
[W3A1
]
.*1
>
.

Connect
battery
ground
cable
and
turn
ignition
switch

"ON"
.
Does
airbag
warning
light
go
"OFF"
after
8
seconds

and
remain
off
for
more
than
30
seconds?
See
"NOTE
:"
.

If
"YES"
proceed
to
step
16)
.

If
"NO"
proceed
to
step
9)
.

15)
Connect
battery
ground
cable
and
turn
ignition

switch
"ON"
.
Does
airbag
warning
light
go
"OFF"
after
8

seconds
and
remain
off
for
more
than30
seconds?
See

"NOTE
:"
.

If
"YES"
proceed
to
step
16)
.

If
"NO"
proceed
to
step
1)
.

16)
Perform
clear
memory
procedure
.
<
Ref
.
to
5-5

[T4C0]
.*2
>

If
memory
cannot
be
cleared,
another
trouble
code
exists
.

Return
to
step
1)
.

If
memory
can
be
cleared,
proceed
to
step
17)
.

17)
END
NOTE
:

e
Always
remember
to
secure
the
greendouble
locks

before
turning
the
ignition
switch
"ON"
.

9
In
some
cases
the
airbag
warning
light
will
go
"OFF"

after
8
seconds
but
will
turn
"ON"
again
within
30
sec-

onds
.
In
this
case
continue
diagnostics
with
the
basic

diagnostics
procedures
or
trouble
code
procedures
.

14

5-5b
[75G03
SUPPLEMENTAL
RESTRAINT
SYSTEM
(ELECTRIC
SENSOR
TYPE)

5
.
Diagnostics
Chart
with
Trouble
Code

1
.
Airbag
main
harness
inspection

m

3C

345
b
AB9

1C

`r
3C

B5M0120A

G
:
TROUBLE
CODE
22

DIAGNOSIS
:

"
Airbag
main
harness
circuit
is
open
.

"
Airbag
module
harness
(Passenger)
circuit
is
open
.

"
Airbag
control
module
is
faulty
.

CAUTION
:

Before
performing
diagnostics
on
airbag
system,
turn

ignition
switch
"OFF",
disconnect
battery
ground
cable

and
then
wait
at
least
20
seconds
.

1
.
AIRBAG
MAIN
HARNESS
INSPECTION

1)
Remove
front
pillar
lower
trim
(Passenger
side)
.
<
Ref
.

to
5-3
[W5A1]
.*1
>,disconnect
connector
(AB9)
and

(AB10)
and
connect
connector
(AB9)
to
test
harness
C

connector
(1C)
.

(5B)
No
.
6
-
(3C)
No
.
4
:

Is
resistance
less
than10
91?

Go
to
next
CHECK

No
:
Replace
airbag
main
harness
.

CHECK
:
Connector
&
terminal

(58)
No
.
7
-
(3C)
No
.
3
:

Is
resistance
less
than
10
S2?

,rES
:
Replace
airbag
control
module
.

No
:
Replace
airbag
main
harness
.

2)
Disconnect
connector
(AB6)
<
Ref
.
to
5-5
[W6A0].*2
>

from
airbag
control
module,
and
connect
it
to
test
harness

B2
connector
(8B)
terminal,

3)
Measure
resistance
between
test
harness
B2
connec-

tor
(5B)
and
test
harness
C
connector
(3C)
terminals
.

CHECK
:
Connector
&
terminal

24

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
[T5H2]
SUPPLEMENTAL
RESTRAINT
SYSTEM
(ELECTRIC
SENSOR
TYPE)

5
.
Diagnostics
Chart
with
Trouble
Code

2
.
AIRBAG
MAIN
HARNESS
INSPECTION

B31
AB1

2A
5A

I

rrrrr

e
1
214s6'
9
1
10
1
11
1
12
1314IS18
17
18

B5M01198

1)
Go
to
step
2)
below
after
performing
diagnostics
on

airbag
system
asher
diagnosis
procedure
under
"1
.
AIR-

BAG
CONTROLMODULE
INSPECTION"
previouslyout-

lined
.

2)
Turn
ignition
switch
"OFF",
disconnect
battery
ground

cable
and
then
wait
at
least
20
seconds
.

3)
Disconnect
connector
(AB1)from
body
harness
con-

nector
(B31)
at
front
lower
pillar
(driver
side),
and
connect

connector
(AB1)
to
test
harness
A
connector
(2A)
.

4)
Measure
resistance
between
test
harness
A
connector

(5A)
and
test
harness
B2
connector
(5B)
terminals
.

CHECK
:
Connector
&
terminal

,mss
:
Go
to
step
3
.

No
:
Replace
airbag
main
harness
.

(5A)
No
.
9
-
(58)
No
.
5
:

Is
resistance
less
than
10
S2?

ves
:
Go
tostep
5)
.

No
:
Replace
airbag
main
harness
.

5)
Measure
resistance
between
each
terminalof
connec-

tors
(5A)
and
(5B)
and
chassis
ground
.

CHECK
:
Connector
&
terminal

(5A)
No
.
9
(+)
-
Chassis
ground
(
)
:

,rES
:
Go
to
next

No
:
Replace
airbag
main
harness
.

CHECK
:
Connector
&
terminal

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

Is
resistance
more
than10
K2?

3
.
FUSENo
.
16
INSPECTION

Make
sure
ignition
switch
is
turned
"OFF",
then
remove
and
visually
check
fuse
No
.
16
.

CHECK
:
Is
fuse
No
.
16
blown?

,res
:
Replace
fuse
No
.
16
.
If
fuse
No
.
16
blows
again,

repair
body
harness
.

No
:
Repair
body
harness
.

26