PROCEDURE
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK WARNING LIGHT. Check whether the airbag warning light in the combination meter is lit. | Does the airbag warning light illuminate? | Go to step 2 . | Perform the diagnosis according to phenomenon of the problem. |
| 2 READ DTC. Turn the ignition switch to OFF. Connect the Subaru Select Monitor to data link connector. Turn the ignition switch to ON and run the Subaru Select Monitor. Read the DTC. < Ref. to OPERATION , Read Diagnostic Trouble Code (DTC). > NOTE: If the communication function of the Subaru Select Monitor cannot be executed properly, check the communication circuit. < Ref. to INSPECTION , Subaru Select Monitor. > Record all DTCs, time stamp and freeze frame data. NOTE: For time stamp, refer to "LAN SYSTEM". < Ref. to TIME STAMP , CAUTION, General Description. > | Is DTC displayed? | Go to step 3 . | Go to "Airbag Warning Light Failure" < Ref. to AIRBAG WARNING LIGHT FAILURE . >. |
| 3 PERFORM DIAGNOSIS. Determine the possible cause from "List of Diagnostic Trouble Code (DTC)" < Ref. to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >. Inspect the DTC using "List of Diagnostic Trouble Code (DTC)". Repair the trouble cause. Perform the Clear Memory Mode. < Ref. to CLEAR MEMORY MODE . > Perform the Inspection Mode. < Ref. to INSPECTION MODE . > Read any other DTCs displayed. | Is DTC displayed? | Perform the procedure 1 ) to 5 ) in step 3. | Finish the diagnosis. |
| NOTE |
|---|
| If the communication function of the Subaru Select Monitor cannot be executed properly, check the communication circuit. < Ref. to INSPECTION , Subaru Select Monitor. > |
| NOTE |
|---|
| For time stamp, refer to "LAN SYSTEM". < Ref. to TIME STAMP , CAUTION, General Description. > |
Scheme 197
CAUTION
- 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.
- Do not replace the seat cushion pad and seat cushion cover alone. Always replace seat cushion & frame assembly as a set. The seat cushion pad, cushion frame, and seat cushion cover 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.
- Never connect the battery in reverse polarity. Occupant detection system may be destroyed instantly.
- 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.
- 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.
- Every occupant detection system-related part is a precision part. Do not drop them. CAUTION: Do not use electrical test equipment on wiring harness and connector circuits of the airbag system. Be careful not to damage the airbag system wiring harness when servicing the occupant detection system. Refer to CAUTION in Airbag System when repairing the occupant detection system. < Ref. to «CAUTION»(ref-662142-S33828179652014101300000) , General Description. >
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. |
GENERAL TOOL
| TOOL NAME | REMARKS |
|---|---|
| Circuit tester | Used for measuring resistance, voltage and current. |
Scheme 198
Scheme 199
- How to disconnect: Press 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.
- 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.
AIRBAG CONTROL MODULE
Refer to Airbag System section. < Ref. to AIRBAG CONTROL MODULE , PROCEDURE, Airbag Connector. >
BUCKLE SWITCH (PASSENGER'S SEAT)
Refer to Airbag System section. < Ref. to BUCKLE SWITCH RH , PROCEDURE, Airbag Connector. >
COMMUNICATION FOR INITIALIZING THE AIRBAG SYSTEM IS IMPOSSIBLE DETECTING CONDITION
Defective harness connector
COMMUNICATION FOR INITIALIZING ONLY THE OCCUPANT DETECTION SYSTEM IS IMPOSSIBLE
Note. The occupant detection system communicates with the Subaru Select Monitor via the airbag control module.
DETECTING CONDITION
Defective harness connector between airbag control module and occupant detection control module
Recreate the circumstance by referring to the conditions described in the checklist.
LIST
| DTC | Item | Content of diagnosis | Reference |
|---|---|---|---|
| B1650 | Occupant Classification System Malfunction | Occupant detection sensor is faulty. Occupant detection control module is faulty. Occupant detection harness is faulty. Fuse No. 25 is blown. | < Ref. to DTC B1650 OCCUPANT CLASSIFICATION SYSTEM MALFUNCTION , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| B1655 | Front Buckle Switch RH Failure | Passenger's buckle switch circuit is open, shorted or shorted to ground. Occupant detection system is faulty. Occupant detection harness is faulty. | < Ref. to DTC B1655 FRONT BUCKLE SWITCH RH FAILURE , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| B1760 | Sensor Mat Abnormal | Occupant detection sensor is faulty. Occupant detection sensor is open, shorted between terminals, shorted to power supply or shorted to ground. Seat heater is open. Occupant detection control module is faulty. | < Ref. to DTC B1760 SENSOR MAT ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| B1771 | Buckle Switch Abnormal | Passenger's buckle switch is faulty. Passenger's buckle switch circuit is open, shorted or shorted to ground. Occupant detection system is faulty. Occupant detection harness is faulty. | < Ref. to DTC B1771 BUCKLE SWITCH ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| B1795 | ECU Internal Circuit Fault | Occupant detection control module is faulty. | < Ref. to DTC B1795 ECU INTERNAL CIRCUIT FAULT , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |