Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 657

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)-16,
OPERATION, Read Diagnostic Trouble Code
(DTC).>
NOTE:

If the communication function of the Subaru Se-
lect Monitor cannot be executed properly,
check the communication circuit. <Ref. to
AB(diag)-28, COMMUNICATION FOR INI-
TIALIZING IMPOSSIBLE, INSPECTION, Sub-
aru Select Monitor.>
5) Record all DTCs and freeze frame data.

Is DTC displayed?

Go to step

Go to “Airbag
Warning Light Fail-
ure” <Ref. to
AB(diag)-35, Air-
bag Warning Light
Failure.>.

PERFORM DIAGNOSIS.
1) Determine the possible cause from “List of
Diagnostic Trouble Code (DTC)” <Ref. to
OD(diag)-21, 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)-18, Clear Memory Mode.>
5) Perform the Inspection Mode. <Ref. to
OD(diag)-17, 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

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 Opera-
tion

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

Passengers airbag ON/OFF
indicator operation

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)-14, 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 60 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

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Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 657

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