Occupant Detection System (diagnostics) Subaru Impreza WRX GH

PROCEDURE

DIAGNOSIS PROCEDURE

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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. SYSTEM CALIBRATION (REZEROING), OPERATION, Subaru Select Monitor. > Failure to do so may cause improper operation of the passenger 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. Always replace the seat cushion pad and 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 passenger 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 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 20 seconds or more. Occupant detection control module may be damaged.
8. All passenger detection system parts are precision components. Do not drop them.

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

PREPARATION TOOL

SPECIAL TOOL

SPECIAL TOOL CHART ILLUSTRATION TOOL NUMBER DESCRIPTION REMARKS 1B021XU0 SUBARU SELECT MONITOR III KIT Used for troubleshooting the electrical system

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1. TEST HARNESS D SPECIAL TOOL CHART ILLUSTRATION TOOL NUMBER DESCRIPTION REMARKS 98299AG060 TEST HARNESS D Used when measuring voltage and resistance of the front seat belt buckle switch.
2. TEST HARNESS Y SPECIAL TOOL CHART ILLUSTRATION TOOL NUMBER DESCRIPTION REMARKS 98299AG040 TEST HARNESS Y Used for diagnosing seat belt buckle switch. TEST HARNESS AB SPECIAL TOOL CHART ILLUSTRATION TOOL NUMBER DESCRIPTION REMARKS 98299XA000 TEST HARNESS AB Used when measuring voltage and resistance of occupant detection system. TEST HARNESS AE SPECIAL TOOL CHART ILLUSTRATION TOOL NUMBER DESCRIPTION REMARKS 98299XA030 TEST HARNESS AE TEST HARNESS Y adapter harness Used for diagnosing seat belt buckle switch. TEST HARNESS AC SPECIAL TOOL CHART ILLUSTRATION TOOL NUMBER DESCRIPTION REMARKS 98299XA010 TEST HARNESS AC Used for diagnosing the seat belt tension sensor. TEST HARNESS AD SPECIAL TOOL CHART ILLUSTRATION TOOL NUMBER DESCRIPTION REMARKS 98299XA020 TEST HARNESS AD Used when measuring voltage and resistance of the seat belt tension sensor. 2. GENERAL TOOL GENERAL TOOL CHART TOOL NAME REMARKS Circuit tester Used for measuring resistance, voltage and current.

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1. How to disconnect: Move the slide lock (A) in the direction of arrow. While holding the slide lock (A) in the moved position, 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 (A), and push it in carefully until a clicking sound is heard.

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ELECTRICAL SPECIFICATION

TERMINAL SPECIFICATIONS

WIRING DIAGRAM

Refer to the electrical wiring diagram. SUPPLEMENTAL RESTRAINTS . >

READ DIAGNOSTIC TROUBLE CODE (DTC)

When malfunction of the airbag system and the occupant detection system occur, the DTC stored in airbag control module will be read out.

Refer to the DTC readout of the airbag system (diagnosis). READ DIAGNOSTIC TROUBLE CODE (DTC) , OPERATION, Subaru Select Monitor . >

Note. For details concerning the operation procedure, refer to the "PC Application Help for Subaru Select Monitor". For details concerning DTCs, refer to the List of Diagnostic Trouble Code (Airbag system, Occupant detection system). LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . > LIST OF DIAGNOSTIC TROUBLE CODE (DTC). >

DISPLAY OF STATUS INFORMATION

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

1. Select {Each System Check} in «Main Menu».
2. On the «System Selection Menu» display screen, select the {Airbag System}.
3. On the «Airbag System» display screen, select the {Status Data}. The following table is for support data. SUPPORT DATA Contents Display Contents Seat position sensor LH - (2) Seat position sensor RH - (2) Seat belt buckle switch LH - (6) Seat belt buckle switch RH Belted (3) /Unbelted (4) /Other (5) /lnitial Setting (1) /- (6) Passenger's airbag control status ON (7) /OFF (8) /Initial Setting (1) *1: The seat position is forward. *2: The seat position is rearward. *3: Displayed when data other than before and behind the seat, such as the breakdown etc, is input. (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 breakdowns is input. (6) Seat belt buckle switch not supported (7) Passenger's airbag operating state (8) Passenger's airbag non-operating state NOTE: For details concerning the operation procedure, refer to the "PC Application Help for Subaru Select Monitor".

CLEAR MEMORY MODE

Clear the DTC stored in the airbag control module after repairing the airbag system and occupant detection system. (After the breakdown is recovered, the breakdown code for completed recoveries are read out when the next breakdown occurs if the memory clear work is not performed.)

1. Select {Each System Check} in «Main Menu».
2. On the «System Selection Menu» display screen, select the {Airbag System}.
3. On the «Airbag System» display screen, select the {Clear Memory}.
4. When the Clear Memory? is shown on the screen, select the [OK].
5. When "Done" is displayed, terminate the Subaru Select Monitor and turn the ignition switch to OFF.

Note. For details concerning the operation procedure, refer to the "PC Application Help for Subaru Select Monitor".

SYSTEM CALIBRATION (REZEROING)

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.

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1. Park empty vehicle on a level surface.
2. Select {Each System Check} in «Main Menu».
3. On the «System Selection Menu» display screen, select the {Occupant Detection System}.
4. On the «Occupant Detection System» display screen, select the {Zero Point Adjustment}.
5. «See service manual. And check vehicle condition for successfully completing the rezeroing» is displayed. Check the following 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 40°C.
6. 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].
7. When the «Re-zeroing Unbelt the Passenger seatbelt Continue: OK, Quit: NO» is displayed, make sure the passenger's seatbelt is disconnected from the buckle and select the [OK].
8. 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], Now «processing.... Wait for a while. Do not touch or give impact to vehicle and seat» 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 10 ).
9. 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.
10. During the system calibration process, if «Re-zeroing 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. READ DIAGNOSTIC TROUBLE CODE (DTC) , OPERATION, Subaru Select Monitor . > 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. SYSTEM CALIBRATION (REZEROING), OPERATION, Subaru Select Monitor. > 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. READ DIAGNOSTIC TROUBLE CODE (DTC) , OPERATION, Subaru Select Monitor . > LIST , List of Diagnostic Trouble Code (DTC) . >

DETECTING CONDITION

Defective harness connector

TROUBLE SYMPTOM

Communication is impossible between the airbag control module and the Subaru Select Monitor. Refer to "Initial Communication Impossible" in the DTC of the airbag system (diagnosis). COMMUNICATION FOR INITIALIZING IMPOSSIBLE , INSPECTION, Subaru Select Monitor . >

1. Defective combination meter
2. Open circuit of harness

1. Airbag warning light remains on.
2. "NO TROUBLE CODE" will be displayed on the Subaru Select Monitor.

Note. For detailed operation procedures, refer to "Airbag Warning Light Failure". AIRBAG WARNING LIGHT FAILURE . > When the airbag warning light is OFF and "NO TROUBLE CODE" is displayed on Subaru Select Monitor, the system is operating properly.

OPERATION

For details on reading DTCs, refer to "Airbag System (Diagnosis) Subaru Select Monitor". SUBARU SELECT MONITOR . >

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

1. Clear the memory in the following steps after the malfunction is repaired.
2. For details to clear the DTC, refer to "Airbag System (Diagnosis) Subaru Select Monitor". SUBARU SELECT MONITOR . >

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

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LIST

LIST OF DIAGNOSTIC TROUBLE CODE

DTC DETECTING CONDITION

System calibration (Rezeroing) was not completed properly.

DIAGNOSIS PROCEDURE

1. Wrong airbag control module is installed.
2. Wrong occupant detection system is installed.

DIAGNOSIS PROCEDURE

1. Passenger's seat belt tension sensor is faulty.
2. Airbag main harness circuit is open or shorted.
3. Occupant detection control module is faulty.

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DIAGNOSIS PROCEDURE

DTC 27 ODS COMMUNICATION ERROR

Perform the diagnosis following diagnostic procedures for the airbag system. DTC 27 ODS COMMUNICATION ERROR , Diagnostic Chart with Trouble Code . >

1. Occupant detection sensor is faulty.
2. Occupant detection control module is faulty.
3. Occupant detection harness is faulty.
4. Rear airbag harness is faulty.
5. Fuse No. 25 (in joint box) is blown.

DIAGNOSIS PROCEDURE

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

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DIAGNOSIS PROCEDURE