Precautions
- Precautions for replacing the occupant detection system The occupant detection control module and the occupant detection sensor of the occupant detection system (only for the passenger's seat) are fixed to the seat cushion frame. Never remove the occupant detection control module or the occupant detection sensor from the seat cushion frame. Do not replace the seat cushion pad by itself. The seat cushion pad & frame ASSY must be replaced as a whole. The seat cushion pad and the cushion frame are adjusted as an assembly at the time of manufacturing. If they are combined with those from any other vehicles or assemblies, the occupant detection system may not operate properly. When removing the seat cushion cover, be sure to replace the hang wire on the seat cushion side with new one. Never connect the battery in reverse polarity. Doing so may immediately damage the occupant detection system. While the engine is running, do not disconnect the battery cable. A large counter electromotive force will be generated in the generator, and this voltage may damage the electronic parts such as an occupant detection control module. Before disconnecting the connectors of the sensors and the control module, make sure to turn the ignition switch to OFF, and wait for 60 seconds or more. Otherwise, it may damage the occupant detection control module. All parts related to the occupant detection system are precision parts. Do not to drop these parts. CAUTION: Do not use an electric test device for the circuit of the airbag system wiring harness and connector. When servicing a occupant detection system, be careful that the airbag system wiring harness is not damaged. When repairing a occupant detection system, refer to the airbag system «PRECAUTIONS»(ref-619160-S18824775192014053000000) .
Preparation Tool
| CAUTION | When measuring the voltage, resistance, etc. of the airbag system components, be sure to use the specified test harness. |
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- Subaru Select Monitor Shape Tool number Remarks 1B022XU0 Used for diagnosing electrical system failure.
- Test harness Y Tool number Remarks 98299AG040 Used for diagnosis of the seat belt buckle switch.
- Test harness AE Tool number Remarks 98299XA030 The adapter harness for the test harness Y. Used for diagnosis of the seat belt buckle switch.
- Test harness AS Tool number Remarks 98299CA010 Used when measuring voltage and resistance of the occupant detection system.
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- How to disconnect the occupant detection system (between airbag rear harness and seat harness). CAUTION: When pulling the slide lock or disconnecting connector, be sure to hold the connector, not the harness. Push the connector lock arm (B) connected to the connector (A) under the passenger's seat to disconnect the connector.
- How to connect the occupant detection system (between airbag rear harness and seat harness). CAUTION: Be sure to insert the connector in until it is locked. Then pull it gently to make sure that it is locked. Holding the connector, push it in securely until a clicking sound is heard.
- Airbag control module Refer to "SRS airbag system". (Refer to «AIRBAG CONNECTOR»(ref-619160-S05675252522014053000000) )
- Buckle switch RH Refer to "SRS airbag system". (Refer to «AIRBAG CONNECTOR»(ref-619160-S05675252522014053000000) )
Subaru Select Monitor
Operation
For the operation procedure, refer to "PC application help for Subaru Select Monitor".
Communication For The Airbag System Initialization Is Not Possible
Perform inspection when communication between the airbag control module and the Subaru Select Monitor is not possible.
Detecting conditions
Harness connector is faulty.
Trouble symptoms
Communication between the airbag control module and the Subaru Select Monitor is not possible.
Inspection steps
Refer to "Communication for initializing is not possible" of SRS airbag system. (Refer to SUBARU SELECT MONITOR )
Only The Occupant Detection System Cannot Establish Communication For Initializing
Note. The occupant detection system communicates with the Subaru Select Monitor via the airbag control module.
Detecting conditions
The harness connector between the airbag control module and the occupant detection control module is faulty.
Trouble symptoms
Communication between the airbag control module and the occupant detection control module is not possible.
Inspection steps
Perform the diagnosis procedure from step 2 of "DTC B1650 Occupant classification system malfunction."
Check List For Interview
| Customer's name | Inspector's name | ||
|---|---|---|---|
| Vehicle bringing date | / / | Registration No. | |
| Odometer readout | Km miles Frame number | ||
| Trouble occurrence date | / / | Registration year | / / |
| Weather | Clear Cloudy Rainy Snowy Other | ||
| Temperature | |||
| Road condition | Flat road Uphill Downhill Unpaved road Other | ||
| Vehicle operation | Start Idling Driving Constant speed Accelerating Decelerating Turning Other | ||
| Details of trouble | |||
| Behavior of the airbag warning light | Normal (When turning the ignition switch to ON, the light illuminates for approx. 6 seconds, then goes off.) The light is stuck on. The light does not illuminate. | ||
| Behavior of the passenger's air bag ON/OFF indicator | Normal (When turning the ignition switch to ON, the indicator light illuminates for approx. 6 seconds, then lights off for approx. 2 seconds, and then the ON (adult) or OFF (child/empty) indicator illuminates.) The light is stuck on. The light does not illuminate. | ||
| DTC output | Normal code DTC: (code:) | ||
ECM Terminal Arrangement
| CAUTION | Do not remove the occupant detection control module and the occupant detection sensor because they are integrated into the seat frame. |
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- Connector between airbag rear harness and seat harness Terminal No. (symbol) Terminal description Conditions Specified condition G2-2 - G2-3 Airbag sensor ASSY communication line IG ON Pulse generation G2-1 - Chassis ground Power supply IG ON 11 to 14 V
- Occupant detection control module Terminal No. (symbol) Terminal description Input/Output value Note 1 Airbag CM communication (+) - Communication line 2 Unused - - 3 Unused - - 4 Buckle switch (-) 0 V Switch ground 5 Unused - - 6 IG power supply 8 - 16 V IG ON 7 Unused - - 8 Buckle switch (+) 0 - IG voltage IG voltage when turning the switch to ON 9 Airbag CM communication (-) 0 V GND 10 Unused
Arrangement Drawing
Refer to ARRANGEMENT DRAWING .
Data list
When an error occurs in the seat belt buckle switch or replacing the switch, check the operation status of each sensor.
- Turn the ignition switch to OFF.
- Connect the SSM3 to the DLC3.
- Turn the ignition switch to ON.
- Turn on the SSM3.
- Select the following menu items: [Occupant Detection System]/[Current Data Display & Save].
- Check the values referring to the list below. Item Contents Note Trip Count - - Count - - Time Count - - Buckle Switch OFF/ON The P seat seat-belt is fastened "ON" The P seat seat-belt is not fastened "OFF" Passenger Occupant Status Adult or Child/Empty or Child An occupant is seated "Adult or Child" Empty or a child seat is installed "Adult or Child" Passenger Airbag Status
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- Inspection Turn the ignition switch to ON. Confirm that the airbag warning light turns on and remains on for approx. 6 seconds, and then turns off even though the switch is still set to ON.
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- Inspection CRS: Child restraint system *1: A child is judged as ON or OFF.