Subaru Legacy III (2000-2003 year). Manual — part 910

AB-66

AIRBAG SYSTEM (DIAGNOSTICS)

DIAGNOSTIC CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)

Q: DTC 52

DIAGNOSIS:
• Side airbag sensor (LH) is faulty.
• Side airbag harness (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.
• When inspecting the side airbag harness, disconnect the side airbag module connector and seat
belt pretensioner connector for the safety reasons.
WIRING DIAGRAM:

6

7

9

5

10

12

1

2

AIRBAG CONTROL MODULE

AB17

AB19

AB23

AB20

AB19

AB23

AB17

1 2

1

4

2

3

SIDE AIRBAG

SENSOR LH

INFLATOR

(SIDE LH)

3

4

1

2

1 2 3 4 5 6

7 8 9 10 11 12

AB-00300

AB-67

AIRBAG SYSTEM (DIAGNOSTICS)

DIAGNOSTIC CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)

Step

Value

Yes

No

1

CHECK SIDE AIRBAG HARNESS (LH).
1) Turn the ignition switch OFF, disconnect

the battery ground cable, and wait more
than 20 seconds.

2) Disconnect the connector (AB21) from the

seat belt pretensioner (LH). <Ref. to SB-7,
Front Seat Belt.>

3) Disconnect connector (AB20) from (AB19).
4) Disconnect connector (AB17) from the air-

bag control module. <Ref. to AB-17, Airbag
Control Module.>

5) Connect connector (1I) in test harness I2 to

connector (AB17).

6) Disconnect connector (AB23) from the side

airbag sensor (LH), and connect connec-
tor (1G) in test harness G to connector
(AB23).

7) Measure the resistance between connector

(3I) in test harness I2 and connector (3G) in
test harness G.

Connector & terminal

(3I) No. 5 — (3G) No. 5:
(3I) No. 14 — (3G) No. 1:
(3I) No. 15 — (3G) No. 4:
(3I) No. 16 — (3G) No. 2:

Is the measured value less than the speci-
fied value?

10

Ω

Go to step 2.

Replace side air-
bag harness.
<Ref. to AB-16,
Side Airbag Har-
ness.>

2

CHECK SIDE AIRBAG HARNESS (RH).
Measure the resistance between connector
(3I) in test harness I2 and the chassis ground.

Connector & terminal

(3I) No. 5 — Chassis ground:
(3I) No. 14 — Chassis ground:
(3I) No. 15 — Chassis ground:
(3I) No. 16 — Chassis ground:

Does the measured value exceed the specified
value?

1 M

Ω

Replace side air-
bag sensor (LH).
<Ref. to AB-18,
Side Airbag Sen-
sor.> When sensor
replacement is not
OK, replace the
airbag control
module. <Ref. to
AB-17, Airbag
Control Module.>

Replace side air-
bag harness.
<Ref. to AB-16,
Side Airbag Har-
ness.>

AB-68

AIRBAG SYSTEM (DIAGNOSTICS)

DIAGNOSTIC CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)

R: DTC 53

DIAGNOSIS:
• Side airbag sensor (RH) is faulty.
When Code 53 is displayed, the circuit within the side airbag sensor (RH) is faulty. Replace the side airbag
sensor (RH).
<Ref. to AB-18, Side Airbag Sensor.>

S: DTC 54

DIAGNOSIS:
• Side airbag sensor (LH) is faulty.
When Code 53 is displayed, the circuit within the side airbag sensor (LH) is faulty. Replace the side airbag
sensor (LH).
<Ref. to AB-18, Side Airbag Sensor.>

T: DTC 55

This code is displayed when the side airbag is deployed.
When this code is displayed, the memory cannot be erased. Replace the following parts.
• Airbag control module. <Ref. to AB-17, Airbag Control Module.>
• Front seat with side airbag module. (Operating side) <Ref. to SE-7, Front Seat.>
• Side airbag sensor. (Operating side) <Ref. to AB-18, Side Airbag Sensor.>

AB-69

AIRBAG SYSTEM (DIAGNOSTICS)

DIAGNOSTIC CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)

MEMO: