Subaru Legacy (2005 year). Service manual — part 900

AB(diag)-37

AIRBAG SYSTEM (DIAGNOSTICS)

Airbag Warning Light Failure

Step

Check

Yes

No

1

CHECK COMBINATION METER.
Turn the ignition switch to ON, and confirm that
warning lights of combination meter are turned
on.

Do warning lights other than
the airbag turn on?

Go to step 2.

Repair the combi-
nation meter
power supply.
<Ref. to IDI-3,
Combination
Meter System.>

2

CHECK FUSE No. 5 (IN MAIN FUSE BOX).
Remove the fuse No. 5 and perform visual
inspection.

Is the fuse No. 5 (in main fuse
box) blown out?

Replace the fuse
No. 5. If the fuse
No. 5 is blown
again, go to step
3.

Go to step 3.

3

CHECK AIRBAG WARNING LIGHT CIRCUIT
(IN COMBINATION METER).
1) Turn the ignition switch OFF, disconnect the
battery ground cable, and wait more than 20
seconds.
2) Disconnect the connector (AB1) from
(B31).
3) Connect the battery ground cable and turn
the ignition switch to ON.

Does airbag warning light turn
on?

Go to step 4.

Replace the airbag
warning light bulb
or combination
meter printed cir-
cuit. <Ref. to IDI-
15, Combination
Meter.>

4

CHECK AIRBAG MAIN HARNESS.
1) Turn the ignition switch OFF, disconnect the
battery ground cable, and wait more than 20
seconds.
2) Connect the connector (AB1) to (B31).
3) Disconnect the connector (AB6) from air-
bag control module.
4) Connect the battery ground cable and turn
the ignition switch to ON.

Does airbag warning light turn
on?

Replace the airbag
control module.
<Ref. to AB-22,
Airbag Control
Module.>

Replace the airbag
main harness with
body harness.

AB(diag)-38

AIRBAG SYSTEM (DIAGNOSTICS)

List of Diagnostic Trouble Code (DTC)

12.List of Diagnostic Trouble Code (DTC)

A: LIST

DTC

Memory func-

tion

Contents of diagnosis

NOTE

11

Experienced

• Airbag main harness circuit is open, shorted or
shorted to ground.
• Airbag module harness (Driver’s side) circuit is
open, shorted or shorted to ground.
• Roll connector circuit is open, shorted or shorted
to ground.
• Airbag control module is faulty.
• Driver’s airbag module is faulty.

<Ref. to AB(diag)-42,
DTC 11 DRIVER’S AIR-
BAG FAILURE, Diag-
nostic Chart with
Trouble Code.>

12

Experienced

• Airbag main harness circuit is open, shorted or
shorted to ground.
• Airbag module harness (Passenger’s side) circuit
is open, shorted or shorted to ground.
• Airbag control module is faulty.
• Passenger’s airbag module is faulty.

<Ref. to AB(diag)-45,
DTC 12 PASSEN-
GER’S AIRBAG FAIL-
URE, Diagnostic Chart
with Trouble Code.>

15

Experienced

• Airbag main harness (Driver’s side) circuit is
shorted to power supply.
• Airbag module harness (Driver’s side) circuit is
shorted to power supply.
• Roll connector is shorted to power supply.
• Airbag control module is faulty.
• Driver’s airbag module is faulty.

<Ref. to AB(diag)-47,
DTC 15 DRIVER’S AIR-
BAG FAILURE, Diag-
nostic Chart with
Trouble Code.>

16

Experienced

• Airbag main harness (Passenger’s side) circuit is
shorted to power supply.
• Airbag module harness (Passenger’s side) circuit
is shorted to power supply.
• Airbag control module is faulty.
• Passenger’s airbag module is faulty.

<Ref. to AB(diag)-49,
DTC 16 PASSEN-
GER’S AIRBAG FAIL-
URE, Diagnostic Chart
with Trouble Code.>

21

Experienced

Airbag control module is faulty.

<Ref. to AB(diag)-50,
DTC 21 AIRBAG ECU
FAILURE, Diagnostic
Chart with Trouble
Code.>

22

Experienced

Front airbag module and seat belt pretensioner (LH/
RH) are deployed.

<Ref. to AB(diag)-51,
DTC 22 FRONT AIR-
BAG FIRING OUTPUT,
Diagnostic Chart with
Trouble Code.>

23

None

(AB6), (AB17) and (AB18) are not connected prop-
erly to airbag control module.

<Ref. to AB(diag)-52,
DTC 23 CONNECTOR
TO AIRBAG ECU, Diag-
nostic Chart with Trou-
ble Code.>

24

None

• Airbag control module is faulty.
• Airbag main harness circuit is open.
• Fuse No. 25 (in joint box) is blown.
• Airbag rear harness circuit is open.

<Ref. to AB(diag)-53,
DTC 24 IG1 OPEN,
Diagnostic Chart with
Trouble Code.>

25

Experienced

• Airbag control module is faulty.
• Airbag main harness circuit is open.
• Fuse No. 12 (in joint box) is blown.
• Airbag rear harness circuit is open.

<Ref. to AB(diag)-55,
DTC 25 IG2 OPEN,
Diagnostic Chart with
Trouble Code.>

31

Experienced

• Front sub sensor harness (RH) circuit is shorted.
• Front sub sensor harness (RH) circuit is open.
• Front sub sensor (RH) is faulty.
• Airbag control module is faulty.

<Ref. to AB(diag)-57,
DTC 31 FRONT SUB
SENSOR RH FAIL-
URE, Diagnostic Chart
with Trouble Code.>

AB(diag)-39

AIRBAG SYSTEM (DIAGNOSTICS)

List of Diagnostic Trouble Code (DTC)

32

Experienced

• Front sub sensor harness (LH) circuit is shorted.
• Front sub sensor harness (LH) circuit is open.
• Front sub sensor (LH) is faulty.
• Airbag control module is faulty.

<Ref. to AB(diag)-59,
DTC 32 FRONT SUB
SENSOR LH FAILURE,
Diagnostic Chart with
Trouble Code.>

33

Experienced

Front sub sensor (RH) is faulty.

<Ref. to AB(diag)-60,
DTC 33 FRONT SUB
SENSOR RH FAIL-
URE, Diagnostic Chart
with Trouble Code.>

34

Experienced

Front sub sensor (LH) is faulty.

<Ref. to AB(diag)-60,
DTC 34 FRONT SUB
SENSOR LH FAILURE,
Diagnostic Chart with
Trouble Code.>

41

Experienced

• Side airbag harness (RH) circuit is faulty.
• Side airbag module (RH) is faulty.
• Airbag control module is faulty.

<Ref. to AB(diag)-61,
DTC 41 SIDE AIRBAG
RH FAILURE, Diagnos-
tic Chart with Trouble
Code.>

42

Experienced

• Side airbag harness (LH) circuit is faulty.
• Side airbag module (LH) is faulty.
• Airbag control module is faulty.

<Ref. to AB(diag)-64,
DTC 42 SIDE AIRBAG
LH FAILURE, Diagnos-
tic Chart with Trouble
Code.>

45

Experienced

• Side airbag harness (RH) circuit is shorted to
power supply.
• Airbag control module is faulty.

<Ref. to AB(diag)-67,
DTC 45 SIDE AIRBAG
RH FAILURE, Diagnos-
tic Chart with Trouble
Code.>

46

Experienced

• Side airbag harness (LH) circuit is shorted to
power supply.
• Airbag control module is faulty.

<Ref. to AB(diag)-70,
DTC 46 SIDE AIRBAG
LH FAILURE, Diagnos-
tic Chart with Trouble
Code.>

51

Experienced

• Side airbag sensor (RH) is faulty.
• Side airbag harness (RH) circuit is faulty.
• Airbag control module is faulty.

<Ref. to AB(diag)-73,
DTC 51 SIDE AIRBAG
SENSOR RH FAIL-
URE, Diagnostic Chart
with Trouble Code.>

52

Experienced

• Side airbag sensor (LH) is faulty.
• Side airbag harness (LH) circuit is faulty.
• Airbag control module is faulty.

<Ref. to AB(diag)-76,
DTC 52 SIDE AIRBAG
SENSOR LH FAILURE,
Diagnostic Chart with
Trouble Code.>

53

Experienced

Side airbag sensor (RH) is faulty.

<Ref. to AB(diag)-79,
DTC 53 SIDE AIRBAG
SENSOR RH FAIL-
URE, Diagnostic Chart
with Trouble Code.>

54

Experienced

Side airbag sensor (LH) is faulty.

<Ref. to AB(diag)-79,
DTC 54 SIDE AIRBAG
SENSOR LH FAILURE,
Diagnostic Chart with
Trouble Code.>

DTC

Memory func-

tion

Contents of diagnosis

NOTE

AB(diag)-40

AIRBAG SYSTEM (DIAGNOSTICS)

List of Diagnostic Trouble Code (DTC)

55

Experienced

• Side airbag module is deployed.
• Curtain airbag module is deployed.

<Ref. to AB(diag)-79,
DTC 55 SIDE CUR-
TAIN AIRBAG FIRING
OUTPUT, Diagnostic
Chart with Trouble
Code.>

56

Experienced

• Curtain airbag sensor (RH) is faulty.
• Curtain airbag harness (RH) circuit is faulty.
• Airbag control module is faulty.

<Ref. to AB(diag)-80,
DTC 56 CURTAIN AIR-
BAG SENSOR RH
FAILURE, Diagnostic
Chart with Trouble
Code.>

57

Experienced

• Curtain airbag sensor (LH) is faulty.
• Curtain airbag harness (LH) circuit is faulty.
• Airbag control module is faulty.

<Ref. to AB(diag)-82,
DTC 57 CURTAIN AIR-
BAG SENSOR LH FAIL-
URE, Diagnostic Chart
with Trouble Code.>

58

Experienced

Curtain airbag sensor (RH) is faulty.

<Ref. to AB(diag)-83,
DTC 58 CURTAIN AIR-
BAG SENSOR RH
FAILURE, Diagnostic
Chart with Trouble
Code.>

59

Experienced

Curtain airbag sensor (LH) is faulty.

<Ref. to AB(diag)-83,
DTC 59 CURTAIN AIR-
BAG SENSOR LH FAIL-
URE, Diagnostic Chart
with Trouble Code.>

61

Experienced

• Seat belt pretensioner (RH) circuit is open, shorted
or shorted to ground.
• Airbag control module is faulty.
• Pretensioner is faulty.
• Pretensioner harness is faulty.

<Ref. to AB(diag)-84,
DTC 61 BELT PRETEN-
SIONER RH FAILURE,
Diagnostic Chart with
Trouble Code.>

62

Experienced

• Seat belt pretensioner (LH) circuit is open, shorted
or shorted to ground.
• Airbag control module is faulty.
• Pretensioner is faulty.
• Pretensioner harness is faulty.

<Ref. to AB(diag)-87,
DTC 62 BELT PRETEN-
SIONER LH FAILURE,
Diagnostic Chart with
Trouble Code.>

65

Experienced

• Seat belt pretensioner (RH) circuit is shorted to
power supply.
• Pretensioner is faulty.
• Pretensioner harness is faulty.
• Airbag control module is faulty.

<Ref. to AB(diag)-90,
DTC 65 BELT PRETEN-
SIONER RH FAILURE,
Diagnostic Chart with
Trouble Code.>

66

Experienced

• Seat belt pretensioner (LH) circuit is shorted to
power supply.
• Pretensioner is faulty.
• Pretensioner harness is faulty.
• Airbag control module is faulty.

<Ref. to AB(diag)-93,
DTC 66 BELT PRETEN-
SIONER LH FAILURE,
Diagnostic Chart with
Trouble Code.>

71

Experienced

• Airbag main harness circuit is open, shorted or
shorted to ground.
• Airbag module harness (Driver’s side) circuit is
open, shorted or shorted to ground.
• Roll connector circuit is open, shorted or shorted
to ground.
• Airbag control module is faulty.
• Driver’s airbag module is faulty.

<Ref. to AB(diag)-96,
DTC 71 DRIVER’S AIR-
BAG FAILURE, Diag-
nostic Chart with
Trouble Code.>

DTC

Memory func-

tion

Contents of diagnosis

NOTE