Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 662

OD(diag)-21

List of Diagnostic Trouble Code (DTC)

OCCUPANT DETECTION SYSTEM (DIAGNOSTICS)

13.List of Diagnostic Trouble Code (DTC)

A: LIST

DTC

Item

Content of diagnosis

Reference

2A

ODS Calibration error

System calibration (Rezeroing) was not completed
normally.

<Ref. to OD(diag)-22,
DTC 2A ODS CALIBRA-
TION ERROR, Diagnos-
tic Procedure with
Diagnostic Trouble Code
(DTC).>

2B

ODS System wrong parts

• Wrong airbag control module is installed.
• Wrong occupant detection system is installed.
• Occupant detection system is faulty.

<Ref. to OD(diag)-23,
DTC 2B ODS SYSTEM
WRONG PARTS, Diag-
nostic Procedure with
Diagnostic Trouble Code
(DTC).>

2C

Belt tension Sensor failure

• Passenger’s seat belt tension sensor is faulty.
• Airbag rear harness circuit is open or shorted.
• Occupant detection system is faulty.
• Occupant detection harness is faulty.

<Ref. to OD(diag)-24,
DTC 2C BELT TENSION
SENSOR FAILURE,
Diagnostic Procedure
with Diagnostic Trouble
Code (DTC).>

27

ODS Communication error

• Occupant detection control module and airbag con-
trol module communication is faulty.
• Airbag rear harness circuit is open, shorted,
shorted to ground or shorted to power supply.
• Occupant detection harness is faulty.
• Occupant detection system is faulty.
• Airbag control module is faulty.

<Ref. to OD(diag)-25,
DTC 27 ODS COMMU-
NICATION ERROR,
Diagnostic Procedure
with Diagnostic Trouble
Code (DTC).>

29

ODS failure

• Occupant detection sensor is faulty.
• Occupant detection control module is faulty.
• Occupant detection harness is faulty.
• Fuse No. 25 (in joint box) is blown.

<Ref. to OD(diag)-26,
DTC 29 ODS FAILURE,
Diagnostic Procedure
with Diagnostic Trouble
Code (DTC).>

37

Buckle Switch RH failure

• Passenger’s buckle switch circuit is open, shorted
or shorted to ground.
• Occupant detection system is faulty.
• Occupant detection harness is faulty.

<Ref. to OD(diag)-27,
DTC 37 BUCKLE
SWITCH RH FAILURE,
Diagnostic Procedure
with Diagnostic Trouble
Code (DTC).>

OD(diag)-22

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

OCCUPANT DETECTION SYSTEM (DIAGNOSTICS)

14.Diagnostic Procedure with Diagnostic Trouble Code (DTC)

A: DTC 2A ODS CALIBRATION ERROR

DTC DETECTING CONDITION:

System calibration (Rezeroing) was not completed properly.

Step

Check

Yes

No

1

PERFORM RE-ZEROING.
Perform system calibration using the Subaru
Select Monitor. <Ref. to OD(diag)-14, SYSTEM
CALIBRATION (REZEROING), OPERATION,
Subaru Select Monitor.>

Did the system calibration com-
plete properly?

Finish the diagno-
sis.

Follow the system
calibration proce-
dures. <Ref. to
OD(diag)-14, SYS-
TEM CALIBRA-
TION
(REZEROING),
OPERATION, Sub-
aru Select Moni-
tor.>

OD(diag)-23

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

OCCUPANT DETECTION SYSTEM (DIAGNOSTICS)

B: DTC 2B ODS SYSTEM WRONG PARTS

DTC DETECTING CONDITION:

• Wrong airbag control module is installed.

• Wrong occupant detection system is installed.

Step

Check

Yes

No

1

CHECK OCCUPANT DETECTION SYSTEM.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 60 sec-
onds or more.
2) Replace the passenger’s seat cushion pad
frame assembly. <Ref. to SE-6, REMOVAL,
Front Seat.> <Ref. to SE-8, PASSENGER’S
SEAT, DISASSEMBLY, Front Seat.>
3) Connect the ground cable to battery.
4) Connect Subaru Select Monitor to the vehi-
cle and perform the system calibration. <Ref. to
OD(diag)-14, SYSTEM CALIBRATION (REZE-
ROING), OPERATION, Subaru Select Moni-
tor.>

Did the system calibration com-
plete properly?

Finish the diagno-
sis.

Go to step

2.

2

CHECK AIRBAG CONTROL SYSTEM.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 60 sec-
onds or more.
2) Replace the airbag control module. <Ref. to
AB-21, REMOVAL, Airbag Control Module.>
3) Connect the ground cable to battery.
4) Connect Subaru Select Monitor to the vehi-
cle and perform the system calibration. <Ref. to
OD(diag)-14, SYSTEM CALIBRATION (REZE-
ROING), OPERATION, Subaru Select Moni-
tor.>

Did the system calibration com-
plete properly?

Finish the diagno-
sis.

Check between the
occupant detection
control module and
airbag control
module.

OD(diag)-24

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

OCCUPANT DETECTION SYSTEM (DIAGNOSTICS)

C: DTC 2C BELT TENSION SENSOR FAILURE

DTC DETECTING CONDITION:

• Passenger’s seat belt tension sensor is faulty.

• Airbag main harness circuit is open or shorted.

• Occupant detection control module is faulty.

WIRING DIAGRAM:

Occupant Detection System <Ref. to WI-87, WIRING DIAGRAM, Occupant Detection System.>

Step

Check

Yes

No

1

CHECK POOR CONTACT OF CONNEC-
TORS.
Check for poor contact of the connectors
between the occupant detection control module
and belt tension sensor.

Is there poor contact?

Reconnect the
connector. If the
fault is not fixed,
replace the airbag
harness.

Go to step

2.

2

CHECK BELT TENSION SENSOR.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait for 60 sec-
onds or more.
2) Disconnect the belt tension sensor connec-
tor (AB56) from the airbag harness.
3) Connect the test harness AC to the connec-
tor (AB56).
4) Connect the battery ground terminal and
turn the ignition switch to ON.

Does the airbag warning light
illuminate for approximately 6
seconds and go off?

Replace the seat
belt outer. <Ref. to
SB-18, OUTER
SEAT BELT
ASSEMBLY,
REMOVAL, Front
Seat Belt.>

Go to step

3.

3

5

6

4

1

2

3

AB53

AB59

AB56

1 2 3
4 5 6

AB53

AB56

1 2 3

OD-00074

9

4

14

16

AB61

OCCUPANT DETECTION

CONTROL MODULE

1 2 3 4 5 6 7 8 9

11 12 13 14 15 16 17 18

10

AB61

TO POWER SUPPLY CIRCUIT

FB-47

F/B FUSE NO. 25

(IG)

BELT

TENSION

SENSOR