Subaru Legacy IV (2008 year). Service manual — part 1017
AB(diag)-56
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
E: DTC 21 AIRBAG ECM FAILURE
DTC DETECTING CONDITION:
Airbag control module is faulty.
CAUTION:
• Before diagnosing the airbag system, be sure to turn the ignition switch to OFF, disconnect the
ground cable from the battery, and wait 20 seconds or more before starting to work.
• When replacing the airbag module, seat belt pretensioner, roll connector, control module and sen-
sor, reconnect each part and check that the warning light operates properly.
Step
Check
Yes
No
1
CHECK IF DTC 21 IS INDICATED.
Read the DTC. <Ref. to AB(diag)-24, READ
DIAGNOSTIC TROUBLE CODE (DTC),
OPERATION, Subaru Select Monitor.>
Does the Subaru Select Moni-
tor display DTC21?
Replace the airbag
control module.
<Ref. to AB-20,
Airbag Control
Module.>
Perform the Clear
Memory Mode.
<Ref. to AB(diag)-
25, CLEAR MEM-
ORY MODE,
OPERATION, Sub-
aru Select Moni-
tor.>
AB(diag)-57
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
F: DTC 22 FRONT AIRBAG FIRING OUTPUT
WIRING DIAGRAM:
This DTC is indicated when the front airbag module and the pretensioner are deployed.
Once this DTC is displayed, the memory cannot be cleared. Therefore replace the following parts.
• Airbag control module <Ref. to AB-20, Airbag Control Module.>
• Driver’s airbag module <Ref. to AB-14, Driver’s Airbag Module.>
• Passenger’s airbag module <Ref. to AB-15, Passenger’s Airbag Module.>
• Front sub sensor of both sides <Ref. to AB-21, Front Sub Sensor.>
• Front outer seat belt with pretensioner of both sides <Ref. to SB-18, Front Seat Belt.>
• Steering roll connector <Ref. to AB-25, Roll Connector.>
• Occupant detection system (passenger’s seat cushion & frame assembly) <Ref. to SE-9, Front Seat.>
AB6
AB6
AB18
AB17
AB26
2
1
AB9
AB10
AB21
1
4
2
1
8
7
5
6
3
4
AB2
AB7
AB38
2
1
1
2
1
2
3
4
AB37
3
2
2
1
5
6
4
3
AIRBAG CONTROL MODULE
PRETENSIONER LH
PRETENSIONER RH
STEERING
ROLL
CONNECTOR
AIRBAG MODULE
(DRIVER SIDE)
AIRBAG MODULE
(PASSENGER SIDE)
AB17
AB18
AB38
1 2
AB26
AB21
AB37
1 2
AB9
AB2
1 2 3 4
AB-02107
18 19 20
21 22 23 24 25 26 27 28
1 2 3 4
11 12 13 14
16 17
15
29 30
18 19 20 21 22 23 24
1 2 3 4
11 12 13 14
16
17
15
18 19 20 21 22 23 24
1 2 3 4
11 12 13 14
16
17
15
10
8
7
6
5
9
10
8
7
6
5
9
10
8
7
6
5
9
AB(diag)-58
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
G: DTC 26 PASSENGER’S AIRBAG INDICATOR FAILURE
DTC DETECTING CONDITION:
• Passenger’s airbag indicator is faulty.
• Airbag control module is faulty.
• Airbag main harness circuit is open.
• Body harness circuit is open.
CAUTION:
• Before diagnosing the airbag system, be sure to turn the ignition switch to OFF, disconnect the
ground cable from the battery, and wait 20 seconds or more before starting to work.
• When replacing the airbag module, seat belt pretensioner, roll connector, control module and sen-
sor, reconnect each part and check that the warning light operates properly.
• When inspecting the airbag main harness, disconnect the airbag module connectors of the driver’s
and passenger’s seats for safety.
• When inspecting the airbag rear harness, disconnect the side airbag module connector, curtain
airbag module connector and seat belt pretensioner connector for safety reasons.
WIRING DIAGRAM:
AB6
AB1
B31
7
6
R150
R50
B90
7
8
11
10
PASSENGER'S SEAT
BELT & AIRBAG
WARNING LIGHT
17
23
AB6
1 2
3 4
5 6 7 8 9 10
AB1
R50
R150
1 2 3
4 5 6 7
8 9 10
12 13 14 15
11
16
AB-01765
18 19 20
21 22 23 24 25 26 27 28
1 2 3
5 6 7 8
10
9
4
11 12 13 14
16 17
15
29 30
1 2 3 4 5 6 7 8
AIRBAG CONTROL MODULE
AB(diag)-59
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK POOR CONTACT.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 20 sec-
onds or more.
2) Confirm that firm contact is secured for the
connector between the airbag control module
and map light.
Is there poor contact in any
connector?
Replace the airbag
harness connec-
tor.
Go to step 2.
2
CHECK AIRBAG MAIN HARNESS.
1) Disconnect the connectors (AB6, AB17,
AB18) from airbag control module.
2) Connect the battery ground terminal and
turn the ignition switch to ON.
NOTE:
Neither of ON/OFF illuminates when it is nor-
mal.
Does the passenger’s airbag
indicator illuminate?
Go to step 3.
Go to step 4.
3
CHECK AIRBAG MAIN HARNESS.
1) Turn the ignition switch to OFF.
2) Remove the map light and disconnect the
connector (R150).
3) Connect the test harness AG connector
(1AG) to the connectors (AB6, AB17, AB18).
4) Measure the resistance between connector
(2AG) in the test harness AG and chassis
ground.
Connector & terminal
(2AG) No. 9 — (2AG) No. 8:
(2AG) No. 9 — Chassis ground:
(2AG) No. 8 — Chassis ground:
Is the resistance 1 M
: or
more?
Replace the map
light. <Ref. to LI-
32, REMOVAL,
Spot Map Light.>
Repair the bulk-
head harness. Or
replace the airbag
main harness
along with body
harness.
4
CHECK AIRBAG HARNESS.
1) Connect the connectors (7AG) and (8AG) in
the test harness AG.
2) Connect the battery ground terminal and
turn the ignition switch to ON.
Does the passenger’s airbag
indicator illuminate?
Replace the airbag
control module.
<Ref. to AB-20,
Airbag Control
Module.>
Go to step 5.
5
CHECK AIRBAG HARNESS.
1) Turn the ignition switch to OFF.
2) Connect the test harness AG connector
(1AG) to the connectors (AB6, AB17, AB18).
3) Measure the resistance between connector
(2AG) in the test harness AG and connector
(R150).
Connector & terminal
(2AG) No. 9 — (R150) No. 7:
(2AG) No. 8 — (R150) No. 8:
Is the resistance less than 10
:? Go to step 6.
Repair the bulk-
head harness. Or
replace the airbag
main harness
along with body
harness.
6
CHECK BODY HARNESS.
1) Turn the ignition switch to ON.
2) Measure the voltage between connector
(R150) and chassis ground.
Connector & terminal
(R150) No. 4 — Chassis ground:
Is the voltage 10 V or more?
Replace the map
light. <Ref. to LI-
32, REMOVAL,
Spot Map Light.>
Repair the map
light power supply
line.
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