Subaru Outback (BR): Occupant Detection System (Diagnostics)

Basic Diagnostic Procedure

A: PROCEDURE

Check List for Interview

A: CHECK

General Description

A: CAUTION

1) If the seat cushion cover is removed or replaced, make sure to perform the occupant detection system adjustment after installing the seat to the vehicle.

<Ref. to OD(diag)-15, System Calibration (Rezeroing).> Failure to do so may cause improper operation of the occupant detection system.

2) The occupant detection system (passenger seat only) control module and the occupant detection sensor are fixed to the seat cushion frame. Never remove the occupant detection control module or the occupant detection sensor from the seat cushion frame.

3) Do not replace the seat cushion pad by itself. Always replace the seat cushion pad & frame assembly as a set. The seat cushion pad and cushion frame are adjusted as a set at the time of manufacture.

If cushion pads and cushion frames are combined from those of other vehicles or other sets, the occupant detection system may not operate properly.

4) If the seat cushion cover is removed, make sure to replace the hang wire on the seat cushion cover side with a new wire.

5) Never connect the battery in reverse polarity.

Occupant detection system may be destroyed instantly.

6) Do not disconnect the battery terminals while the engine is running. A large counter electromotive force will be generated 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 ignition switch to OFF and wait for 60 seconds or more.

Occupant detection control module may be damaged.

8) Every occupant detection system-related part is a precision part. Do not drop them.

CAUTION:

• Do not use electrical test devices on airbag system wiring harnesses or connector circuits.
• Be careful not to damage the airbag system wiring harness, when servicing the occupant detection system.
• Refer to CAUTION in Airbag System when repairing occupant detection system. <Ref. to AB-9, 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

C: PREPARATION TOOL

CAUTION: To measure the voltage and resistance of airbag system and occupant detection system components, be sure to use the specified test harness.

1. SPECIAL TOOL

• TEST HARNESS Y

• TEST HARNESS AE

2. GENERAL TOOL

Electrical Component Location

A: LOCATION

1. Occupant detection control module
2. Occupant detection sensor
3. Airbag ON/OFF indicator light
4. Buckle switch (passenger's seat)

Airbag Connector

A: PROCEDURE

1. OCCUPANT DETECTION SYSTEM (BETWEEN AIRBAG REAR HARNESS AND SEAT HARNESS)

1) How to disconnect: Push the lock arm (A), and disconnect the connector.

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 Airbag System section. <Ref. to AB-19, AIRBAG CONTROL MODULE, PROCEDURE, Airbag Connector.>

3. BUCKLE SWITCH RH

Refer to Airbag System section. <Ref. to AB-27, BUCKLE SWITCH RH, PROCEDURE, Airbag Connector.>

Control Module I/O Signal

A: ELECTRICAL SPECIFICATION

CAUTION: Never remove the occupant detection control module, occupant detection sensor or seat frame, because they are integrated into one unit.

B: WIRING DIAGRAM

Refer to the electrical wiring diagram. <Ref. to WI-191, WIRING DIAGRAM, Occupant Detection System.>

Subaru Select Monitor

A: OPERATION

For detailed operation procedures, refer to the "PC application help for Subaru Select Monitor".

B: INSPECTION

1. COMMUNICATION FOR INITIALIZING IMPOSSIBLE

DETECTING CONDITION:

Defective harness connector

TROUBLE SYMPTOM:

Communication is impossible between the airbag control module and the Subaru Select Monitor.

Refer to "Communication for Initializing Impossible" in AIRBAG SYSTEM (DIAGNOSTICS). <Ref. to AB(diag)-29, COMMUNICATION FOR INITIALIZING IMPOSSIBLE, INSPECTION, Subaru Select Monitor.>

Read Diagnostic Trouble Code (DTC)

A: OPERATION

Read out the DTC stored in airbag control module.

For operation procedures, refer to AIRBAG SYSTEM (DIAGNOSTICS). <Ref. to AB(diag)-32, OPERATION, Read Diagnostic Trouble Code (DTC).>

NOTE: For details concerning DTCs, refer to the List of Diagnostic Trouble Code (DTC) (airbag system, occupant detection system). <Ref. to AB(diag)-41, List of Diagnostic Trouble Code (DTC).> <Ref. to OD(diag)-19, List of Diagnostic Trouble Code (DTC).>

Inspection Mode

A: PROCEDURE

Recreate the circumstance by referring to the conditions described in the checklist.

Clear Memory Mode

A: OPERATION

For operation procedures, refer to AIRBAG SYSTEM (DIAGNOSTICS). <Ref. to AB(diag)-34, OPERATION, Clear Memory Mode.>

Display of Status Information

A: OPERATION

Check the operating condition of each sensor in the event of malfunction in seat belt buckle switch and seat position sensor, or when the seat belt buckle switch and seat position sensor has been replaced.

1) On "Main Menu" display, select {Each System Check}.

2) On "System Selection Menu" display, select {Airbag System}.

3) On "Airbag System" display, select {Status Data}.

The following table is for support data.

*1: Displayed when it is initial
*2: Seat position sensor not supported
*3: Seat belt fastened
*4: Seat belt not fastened
*5: Displayed when data other than belt fastened or not fastened, such as breakdown, is input
*6: Seat belt buckle switch not supported
*7: Passenger's airbag operating state
*8: Passenger's airbag non-operating state

NOTE: For detailed operation procedures, refer to "PC application help for Subaru Select Monitor".

System Calibration (Rezeroing)

A: OPERATION

NOTE: When replacing the occupant detection system, or removing and disassembling the passenger's seat, always perform the system calibration after installing a seat in the vehicle.

1) Park empty vehicle on a level surface.

2) Check the following items to adjust the condition of the vehicle.

• Adjust the seat backrest to be fully upright. (For models with power seats, press the power seat button until the backrest comes to a stop.)
• Adjust the seat slide position all the way back.

  (For models with power seats, press the power seat button until the seat slide does not move any further.)

• Do not place anything on the top of the seat cushion.
• Sit on the seat cushion to smooth the seat surface.
• Check that the passenger's seat belt is not inserted into the buckle, not tense or not stuck.
• Check that ambient temperature is in a range from 0 to 40ºC (32 to 104ºF).

3) Turn the ignition switch OFF once, then turn it ON again.

NOTE:

• This operation is performed to reset the occupant detection.
• Do not touch the seat until the system calibration (Rezeroing) is completed. If you have touched the seat even if only once, re-perform the steps from the step 3) again.

4) On "Main Menu" display, select {Each System Check}.

5) On "System Selection Menu" display, select {Occupant Detection System}.

6) On the {Occupant Detection System} display, select {Rezeroing}.

7) When "See service manual. And check vehicle condition for successfully completing the rezeroing." is displayed, check the condition of the vehicle.

8) When the "Re-zeroing Adjust the passenger seat to the condition shown in service manual" is displayed, slide the passenger seat all the way to the back, check that the backrest is adjusted to all the way up, and select the [OK].

9) When the "Re-zeroing Unbelt the Passenger seatbelt Continue: OK, Quit: NO" is displayed, make sure the passengers seatbelt is disconnected from the buckle and select the [OK].

10) When the "Re-zeroing Empty the passenger seat Continue: OK, Quit: NO" is displayed, make sure that the passenger's seat is empty, airbag OFF indicator illuminates and airbag ON indicator does not illuminate, and select the [OK].

NOTE:

• After selecting the [OK], "In process... Please wait for a while without touching vehicle" is displayed.

  Do not touch or rock the vehicle while the message is displayed.

• During the system calibration process, if the "Re-zeroing is unsuccessful See service manual Press "OK" to END" is displayed, go to step 12).

11) When the re-zeroing is ended normally, the "Re-zeroing is successfully completed Press "OK" to END" is displayed. And then turn the ignition switch to OFF to finish the diagnosis.

12) During the system calibration process, if "Rezeroing is unsuccessful See service manual Press "OK" to END" is displayed, turn the ignition switch to OFF once and turn it ON again, then read the DTC of the airbag system. <Ref. to OD(diag)-11, Read Diagnostic Trouble Code (DTC).>

When DTC is input, fix the fault and then perform the system calibration. When DTC is not input, check the seat and vehicle status and then perform the system calibration again. <Ref. to OD(diag)-15, System Calibration (Rezeroing).>

NOTE: When the re-zeroing is unsuccessful, there could be occupant detection system failure or improper seat and vehicle status. When the airbag warning light illuminates, read the DTC of the airbag system, and perform the diagnosis while referring to List of Diagnostic Trouble Code (DTC). <Ref. to OD(diag)-11, Read Diagnostic Trouble Code (DTC).> <Ref. to AB(diag)-41, LIST, List of Diagnostic Trouble Code (DTC).>

Airbag Warning Light Illumination Pattern

A: INSPECTION

Turn the ignition switch to ON, and confirm that the airbag warning light remains on for approx. 6 seconds and then goes off afterwards.

1. Airbag warning light
2. Approx. 6 sec.
3. Ignition switch ON

Passenger's Airbag ON/OFF Indicator Light Illumination Pattern

A: INSPECTION

1. Passenger's airbag ON indicator light
2. Passenger's airbag OFF indicator light
3. Occupant seating
4. Ignition switch
5. Light OFF
6. Light ON
7. Empty
8. Child
9. Adult
10. OFF
11. ON
12. Approx. 6 sec
13. Approx. 2 sec.

List of Diagnostic Trouble Code (DTC)

A: LIST

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

A: DTC 27 ODS COMMUNICATION ERROR

Perform the diagnosis following diagnostic procedures for the airbag system. <Ref. to AB(diag)-73, DTC 27 ODS COMMUNICATION ERROR, Diagnostic Chart with Trouble Code.>

B: DTC 29 ODS FAILURE

DTC DETECTING CONDITION:

• Occupant detection sensor is faulty.
• Occupant detection control module is faulty.
• Occupant detection harness is faulty.
• Rear airbag harness (RH) is faulty.
• Fuse No. 25 (in fuse box) is blown out.
• System calibration (rezeroing) is unsuccessful.

C: DTC 2A ODS CALIBRATION ERROR

DTC DETECTING CONDITION:

• Calibration of occupant detection control module is initial setting or faulty.
• Occupant detection control module is faulty.

CAUTION: When DTC other than DTC 2A is present, system calibration (re-zeroing) cannot be completed normally.

When occupant detection system DTC other than DTC 2A is present (27, 29, 2B, 37), perform the diagnosis of the DTCs other than 2A first.

D: DTC 2B ODS SYSTEM WRONG PARTS

DTC DETECTING CONDITION:

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

  When DTC 2B is displayed, the occupant detection control module is faulty.

  Replace the occupant detection control module with a genuine occupant detection control module.

E: DTC 37 BUCKLE SWITCH RH FAILURE

DTC DETECTING CONDITION:

• Passenger's buckle switch circuit is open, shorted or shorted to ground.
• Seat harness circuit is open, shorted or shorted to ground.
• Occupant detection control module is faulty.

WIRING DIAGRAM:

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