Subaru Legacy IV (2008 year). Manual - part 1034

AB(diag)-124

Diagnostic Chart with Trouble Code

AIRBAG SYSTEM (DIAGNOSTICS)

OD(diag)-2

Basic Diagnostic Procedure

OCCUPANT DETECTION SYSTEM (DIAGNOSTICS)

1. Basic Diagnostic Procedure

A: PROCEDURE

Step

Check

Yes

No

1

CHECK WARNING LIGHT.
Check whether the airbag warning light in the 
combination meter is lit.

Does the airbag warning light 
illuminate?

Go to step 2.

Perform the diag-
nosis according to 
phenomenon of 
the problem.

2

READ DTC.
1) Turn the ignition switch to OFF.
2) Connect the Subaru Select Monitor to data 
link connector.
3) Turn the ignition switch to ON and run the 
Subaru Select Monitor.
4) Read the DTC. <Ref. to OD(diag)-17, 
OPERATION, Read Diagnostic Trouble Code 
(DTC).>

NOTE:
If the communication function of the Subaru Se-
lect Monitor cannot be executed normally,
check the communication circuit. <Ref. to
AB(diag)-26, COMMUNICATION FOR INI-
TIALIZING IMPOSSIBLE, INSPECTION, Sub-
aru Select Monitor.>
5) Record all DTCs and freeze frame data.

Is DTC displayed?

Go to step 3.

Go to “Airbag 
Warning Light Fail-
ure”<Ref. to 
AB(diag)-33, Air-
bag Warning Light 
Failure.>.

3

PERFORM DIAGNOSIS.
1) Determine the possible cause “List of Diag-
nostic Trouble Code (DTC)”<Ref. to OD(diag)-
22, List of Diagnostic Trouble Code (DTC).>.
2) Inspect the DTC using “List of Diagnostic 
Trouble Code (DTC)”.
3) Repair the trouble cause.
4) Perform the Clear Memory Mode. <Ref. to 
OD(diag)-19, Clear Memory Mode.>
5) Perform the Inspection Mode. <Ref. to 
OD(diag)-18, Inspection Mode.>
6) Read any other DTCs displayed.

Is DTC displayed?

Perform the proce-
dure 1) to 5) in step 
3.

Finish the diagno-
sis.

OD(diag)-3

Check List for Interview

OCCUPANT DETECTION SYSTEM (DIAGNOSTICS)

2. Check List for Interview

A: CHECK

Customer’s name

 

Inspector’s name

 

Date vehicle brought in

/

/

Registration No.

 

Odometer reading

km

miles

V.I.N.

Date problem occurred

/

/

Registration year

/

/

Weather

 Fine
 Cloudy
 Rainy
 Snowy
 Others :

Temperature

°C (      °F)

Road condition

 Flat road
 Uphill
 Downhill
 Gravel road
 Others :

Vehicle operation

 Starting
 Idling
 Driving
 Constant speed
 Accelerating
 Decelerating
 Turning
 Others :

Details of problem

 

Airbag warning light operation

 Normal (After turning the ignition switch to ON, illuminates for 6 seconds then goes off.)
 Remains ON
 Remains OFF

Passenger’s airbag ON/OFF 
indicator does not operate.

 Normal (After turning the ignition switch to ON, illuminates for 6 seconds then goes off for 2 

seconds; Lights ON (adult) or OFF (children/unoccupied).)

 Both remain ON
 Both remain OFF

DTC output

 OK code
 DTC: (Code:

              

)

OD(diag)-4

General Description

OCCUPANT DETECTION SYSTEM (DIAGNOSTICS)

3. General Description

A: CAUTION

1) If the seat cushion cover is removed or replaced,
make sure to perform passenger detection system
adjustment after installing the seat to the vehicle.
<Ref. to OD(diag)-15, SYSTEM CALIBRATION
(REZEROING), OPERATION, Subaru Select Mon-
itor.>
Failure to do so may cause improper operation of
the occupant detection system.
2) The passenger detection system (passenger
seat only) control unit and the passenger detection
sensor are fixed to the seat cushion frame. Never
remove the passenger detection control unit or the
pressure sensor from the seat cushion frame.
3) Do not replace the seat cushion pad by itself. Al-
ways replace the seat cushion pad and frame as-
sembly as a set. The seat cushion pad and cushion
frame are adjusted as a set at the time of manufac-
ture. If cushion pads and cushion frames are com-
bined from those of other vehicles or other sets, the
passenger detection system may not operate prop-
erly.
4) If the seat cushion cover is removed, make sure
to replace the hang wire on the seat cushion side
with a new wire.
5) Never connect the battery in reverse polarity.
Occupant detection system may be destroyed in-
stantly.
6) Do not disconnect the battery terminals while the
engine is running.
A large counter electromotive force will be generat-
ed in the generator, and this voltage may damage
electronic parts such as occupant detection control
module.
7) Before disconnecting the connectors of each
sensor and control module, be sure to turn the igni-
tion switch to OFF and wait for 20 seconds or more.
Occupant detection control module may be dam-
aged.
8) Every occupant detection system-related part is
a precision part. Do not drop them.

CAUTION:
• Do not use electrical test equipment on wir-
ing harness and connector circuits of the air-
bag system.
• Be careful not to damage the airbag system
wiring harness when servicing the occupant
detection system.
• Refer to CAUTION in Airbag System when re-
pairing the occupant detection system. <Ref. to
AB(diag)-4, CAUTION, General Description.>

B: INSPECTION

Measure the battery voltage and check electrolyte.

Standard voltage:

12 V

Specific gravity:

1.260 or more

Fluid level:

Between the upper level and lower level