Subaru Legacy III (2000-2003 year). Manual — part 903

AB-38

AIRBAG SYSTEM (DIAGNOSTICS)

DIAGNOSTIC CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)

D: DTC 16

DIAGNOSIS:
• Airbag main harness circuit (Passenger) is shorted to the power supply.
• Airbag module harness (Passenger) is shorted to the power supply.
• Passenger's airbag module 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 airbag module connector of the driver
and passenger seats for safety reasons.
WIRING DIAGRAM:

10

11

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

AIRBAG CONTROL MODULE

AB6

AB9

AB10

INFLATOR

(PASSENGER SIDE)

1

2

AB9

1 2

AB-00363

AB-39

AIRBAG SYSTEM (DIAGNOSTICS)

DIAGNOSTIC CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)

Step

Value

Yes

No

1

CHECK PASSENGER'S AIRBAG MODULE.
1) Turn the ignition switch OFF, disconnect

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

2) Pull out the two stopper pins and lower the

glove box.

3) Disconnect the connector (AB10) from

(AB9)

4) Connect the connector (1K) in test harness

K to connector (AB9).

5) Connect two airbag resistors to connectors

(3K) and (4K) in test harness K.

6) Connect the battery ground cable and turn

the ignition switch ON.
Does the airbag warning light operate prop-
erly?

Operates properly.

Replace the pas-
senger airbag
module. <Ref. to
AB-13, Passen-
ger's Airbag Mod-
ule.>

Go to step 2.

2

CHECK AIRBAG MAIN HARNESS.
1) Turn the ignition switch OFF, disconnect

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

2) Disconnect two airbag resistors from the

connectors (3K) and (4K) in test harness K.

3) Remove the lower cover and disconnect

the connector (AB3) from (AB8).

4) Disconnect the connector (AB6) from the

airbag control module, and connect the
connector (1I) in test harness I2. <Ref. to
AB-17, Airbag Control Module.>

5) Measure the voltage between connector

(2I) in test harness I2 and the chassis
ground.

Connector & terminal

(2I) No. 2 — Chassis ground:
(2I) No. 5 — Chassis ground:

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

1 V

Replace the airbag
control module.
<Ref. to AB-17,
Airbag Control
Module.>

Replace airbag
main harness.
<Ref. to AB-15,
Main Harness.>

AB-40

AIRBAG SYSTEM (DIAGNOSTICS)

DIAGNOSTIC CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)

E: DTC 21

DIAGNOSIS:
• 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.

Step

Value

Yes

No

1

CHECK IF DTC 21 IS INDICATED.
Read Diagnostic Trouble Code. <Ref. to AB-
20, Read Diagnostic Trouble Code (DTC).>
Is airbag warning light trouble code 21 indi-
cated?

DTC 21 is not indicated.

Perform clear
memory. <Ref. to
AB-22, Clear
Memory Mode.>

Replace the airbag
control module.
<Ref. to AB-17,
REMOVAL, Air-
bag Control Mod-
ule.>

AB-41

AIRBAG SYSTEM (DIAGNOSTICS)

DIAGNOSTIC CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)

F: DTC 22

WIRING DIAGRAM:

This code is indicated when the front airbag and the pretensioner are in operation.
Once this code is indicated, memory is not erasable; therefore change the following parts.
• Airbag control module. <Ref. to AB-17, REMOVAL, Airbag Control Module.>
• Driver's airbag module. <Ref. to AB-12, REMOVAL, Driver's Airbag Module.>
• Passenger's airbag module. <Ref. to AB-13, REMOVAL, Passenger's Airbag Module.>
• Front sub-sensor of both sides. <Ref. to AB-20, REMOVAL, Front Sub Sensor.>
• Front seat belt outer with pretensioner of both sides. <Ref. to SB-7, REMOVAL, Front Seat Belt.>

AB-00367

13

14

2

1

AIRBAG CONTROL MODULE

10

11

5

6

AB18

AB8

AB21

AB26

AB9

AB6

AB17

AB18

1 2

AB7

1 2

PRETENSIONER LH

1

2

AB21

AB17

AB6

AB9

AB10

AB8

AB3

AB7

PRETENSIONER RH

1

2

AB26

INFLATOR

(PASSENGER SIDE)

1

2

1

2

INFLATOR

(DRIVER SIDE)

STEERING
ROLL
CONNECTOR

1

2

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

1 2 3 4 5 6
7 8 9 10 11 12

1 2 3 4 5 6
7 8 9 10 11 12