Subaru Legacy III (2000-2003 year). Service manual — part 906
AB-50
AIRBAG SYSTEM (DIAGNOSTICS)
DIAGNOSTIC CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)
5
CHECK AIRBAG MAIN HARNESS
1) Remove the instrument panel. <Ref. to EI-
35, Instrument Panel Assembly.>
2) Disconnect connector (AB15) from (AB14),
and connect connector (2F) in test harness
F to connector (AB14).
3) Measure the resistance between connector
(3I) in test harness I2 and connector (3F) in
test harness F.
Connector & terminal
(3I) No. 2 — (3F) No. 6:
(3I) No. 4 — (3F) No. 5:
Is the measured value less than the speci-
fied value?
10
Ω
Replace airbag
main harness.
<Ref. to AB-15,
Main Harness.>
6
CHECK AIRBAG MAIN HARNESS
Measure the resistance between connector
(3I) in test harness I2 and the chassis ground.
Connector & terminal
(3I) No. 2 — Chassis ground:
(3I) No. 4 — Chassis ground:
Does the measured value exceed the specified
value?
1 M
Ω
Replace airbag
main harness.
<Ref. to AB-15,
Main Harness.>
7
CHECK FRONT SUB-SENSOR HARNESS
(RH).
1) Connect connector (1F) in test harness F to
the connector (AB15).
2) Measure the resistance between connector
(3H) in test harness H and connector (3F)
in the test harness F.
Connector & terminal
(3F) No. 3 — (3H) No. 5:
(3F) No. 4 — (3H) No. 6:
Is the measured value less than the speci-
fied value?
10
Ω
Replace the front
sub-sensor har-
ness (RH) <Ref. to
AB-21, Front Sub
Sensor Harness.>
8
CHECK FRONT SUB-SENSOR HARNESS
(RH).
Measure the resistance between connector
(3F) in test harness F and the chassis ground.
Connector & terminal
(3F) No. 3 — Chassis ground:
(3F) No. 4 — Chassis ground:
Does the measured value exceed the specified
value?
1 M
Ω
Replace the front
sub-sensor har-
ness (RH) <Ref. to
AB-21, Front Sub
Sensor Harness.>
9
CHECK FRONT SUB-SENSOR (RH).
1) Connect connector (2H) in test harness H
to front sub-sensor (RH).
2) Measure the resistance of the connector
(3H) in test harness H.
Connector & terminal
(3H) No. 3 — No. 4:
Is the measured value within the specified
range?
750
Ω
— 1 K
Ω
Replace the front
sub-sensor (RH)
<Ref. to AB-20,
Front Sub Sen-
sor.>
Step
Value
Yes
No
AB-51
AIRBAG SYSTEM (DIAGNOSTICS)
DIAGNOSTIC CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)
10
CHECK FRONT SUB-SENSOR (RH).
Measure the resistance between connector
(3H) in test harness H and the chassis ground.
Connector & terminal
(3H) No. 3 — Chassis ground:
(3H) No. 4 — Chassis ground:
Does the measured value exceed the specified
value?
1 M
Ω
Finish the diagno-
sis.
Replace the front
sub-sensor (RH)
<Ref. to AB-20,
Front Sub Sen-
sor.>
Step
Value
Yes
No
AB-52
AIRBAG SYSTEM (DIAGNOSTICS)
DIAGNOSTIC CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)
K: DTC 32
DIAGNOSIS:
• 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.
CAUTION:
• Before diagnosing the airbag system, be sure to turn the ignition switch OFF, disconnect the
ground cable from the battery, and wait more than 20 seconds before starting to work.
• Before replacing the airbag module, roll connector, control module, and sensor, reconnect each
part and confirm that the warning light operates properly.
• When inspecting the airbag main harness, disconnect the driver's airbag module and passenger's
airbag module connectors for safety reasons.
WIRING DIAGRAM:
AB-00298
26
15
FRONT SUB SENSOR LH
2
1
1
2
AIRBAG CONTROL MODULE
AB6
AB11
AB12
AB13
AB12
AB13
1 2
AB6
1 2 3
4 5 6
7 8 9 10 11 12 13 14 15 16 17
18 19 20 21 22 23 24 25 26 27 28
2
1
AB-53
AIRBAG SYSTEM (DIAGNOSTICS)
DIAGNOSTIC CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK FRONT SUB-SENSOR (LH) AND
FRONT SUB-SENSOR HARNESS (RH).
1) Turn the ignition switch OFF, disconnect
the battery ground cable, and wait more
than 20 seconds.
2) Disconnect connector (AB6) from the air-
bag control module, and connect connector
(1I) in the test harness I2 to connector
(AB6). <Ref. to AB-17, Airbag Control
Module.>
3) Measure the resistance of the connector
(3I) in the test harness I2.
Connector & terminal
(3I) No. 1 — No. 3:
Is the measured value within the specified
range?
750
Ω
— 1 K
Ω
2
CHECK FRONT SUB-SENSOR (LH) AND
FRONT SUB-SENSOR HARNESS (RH).
Measure the resistance between connector
(3I) in test harness I2 and the chassis ground.
Connector & terminal
(3I) No. 1 — Chassis ground:
(3I) No. 3 — Chassis ground:
Does the measured value exceed the specified
value?
1 M
Ω
Replace the air-
bag control mod-
ule. <Ref. to AB-
17, Airbag Control
Module.>
3
CHECK AIRBAG MAIN HARNESS AND
FRONT SUB-SENSOR HARNESS (LH).
1) Disconnect the connector (AB13) from the
front sub-sensor. <Ref. to AB-20, Front
Sub Sensor.>
2) Connect connector (1H) in test harness H
to connector (AB13).
3) Measure the resistance between connector
(3I) in test harness I2 and connector (3H) in
test harness H.
Connector & terminal
(3I) No. 3 — (3H) No. 5:
(3I) No. 1 — (3H) No. 6:
Is the measured value less than the speci-
fied value?
10
Ω
4
CHECK AIRBAG MAIN HARNESS AND
FRONT SUB-SENSOR HARNESS (LH).
Measure the resistance between connector
(3I) in test harness I2 and the chassis ground.
Connector & terminal
(3I) No. 3 — Chassis ground:
(3I) No. 1 — Chassis ground:
Does the measured value exceed the specified
value?
1 M
Ω
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