Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 659

OD(diag)-9

General Description

OCCUPANT DETECTION SYSTEM (DIAGNOSTICS)

• TEST HARNESS AD

2. GENERAL TOOL

ILLUSTRATION

TOOL NUMBER

DESCRIPTION

REMARKS

98299XA020

TEST HARNESS
AD

Used when measuring voltage and resistance of
the seat belt tension sensor.

TOOL NAME

REMARKS

Circuit tester

Used for measuring resistance, voltage and current.

ST98299XA020

OD-00028

1AD

2AD

3

2

1

3

1

2

3

2

1

3

1

2

OD(diag)-10

Electrical Component Location

OCCUPANT DETECTION SYSTEM (DIAGNOSTICS)

4. Electrical Component Location

A: LOCATION

(1)

Occupant detection control mod-
ule

(3)

Airbag ON/OFF indicator light

(5)

Seat belt tension sensor

(2)

Occupant detection sensor

(4)

Buckle switch (passenger’s seat)

(4)

(3)

OD-00076

(2)

(5)

(1)

OD-00016

(1)

OD-00015

(2)

OD-00098

(3)

(3)

OD-00017

(5)

OD(diag)-11

Airbag Connector

OCCUPANT DETECTION SYSTEM (DIAGNOSTICS)

5. Airbag Connector

A: PROCEDURE

1. OCCUPANT DETECTION SYSTEM (BE-

TWEEN AIRBAG REAR HARNESS AND

SEAT HARNESS) AND BELT TENSION

SENSOR

1) How to disconnect:

Press the lock arm (A) and disconnect the connec-

tor.
CAUTION:

When pulling the slide lock or disconnecting

connector, be sure to hold the connector, not

the harness.

2) How to connect:

Holding the connector, push it in securely until a

clicking sound is heard.
CAUTION:

Be sure to insert the connector in until it is

locked. Then pull it gently to make sure that it is

locked.

2. AIRBAG CONTROL MODULE

Refer to the airbag system section. <Ref. to AB-8,

AIRBAG CONTROL MODULE, PROCEDURE, Air-

bag Connector.>

3. BUCKLE SWITCH RH

Refer to the airbag system section. <Ref. to AB-11,

BUCKLE SWITCH RH, PROCEDURE, Airbag

Connector.>

AB-01325

(A)

OD(diag)-12

Control Module I/O Signal

OCCUPANT DETECTION SYSTEM (DIAGNOSTICS)

6. Control Module I/O Signal

A: ELECTRICAL SPECIFICATION

CAUTION:

Never remove the occupant detection control module, occupant detection sensor or seat frame be-

cause they are integrated into one unit.

B: WIRING DIAGRAM

Refer to the electrical wiring diagram. <Ref. to WI-87, WIRING DIAGRAM, Occupant Detection System.>

Terminal name

Terminal

No.

Input/Output value

Remarks

IG – power supply

9

9 — 16 V

When ignition switch ON

Airbag control module communication

(COM)

10

Open collector terminal

Communication line

Airbag control module communication

(GND)

5

0 V

Ground

Belt tension sensor

(Vcc)

4

0 — 5 V

Belt tension sensor power supply

(Vout)

16

0.5 — 4.5 V

Sensor output voltage

(GND)

14

0 V

Sensor ground

Occupant detection sensor

(Vcc)

6

0 — 5 V

Pressure sensor power supply

(Vout)

7

0.5 — 4.5 V

Sensor output voltage

(GND)

15

0 V

Sensor ground

Buckle switch

1

0 — IG voltage

Ignition voltage when switch ON

Buckle switch

(GND)

2

0 V

Switch ground

AB61

1

2

3

4

5

6

7

8

9

11

12

13

14

15

16

17

18

10

OD-00099

TO