Occupant Detection System (Diagnostics): Diagnosis Subaru BRZ ZC

Inspection

1. Measure the battery voltage and check the battery fluid. Standard voltage: 12V Specific gravity: 1.260 or more

List Of Diagnostic Codes

How To Troubleshoot

1. Bring in the car Next
2. Interview and phenomenon check Phenomenon check Next
3. Warning light check Check CAN communication system. (Refer to «HOW TO TROUBLESHOOT»(ref-619155-S21491093182014053000000) ) RESULT Result Go to The airbag warning light illuminates. A The airbag warning light does not illuminate. B B: Perform a failure diagnosis based on the malfunction symptom. A: Go to Next Step
4. DTC reading Turn the ignition switch to OFF. Connect the Subaru Select Monitor to data link connector. Turn the ignition switch to ON and start the Subaru Select Monitor. Read the DTC. NOTE: If the communication function of the Subaru Select Monitor does not operate properly, inspect the communication circuit. Record all DTCs and failure status information. RESULT Result Go to DTC is detected. A DTC is not detected. B B: Refer to "Fault in the airbag warning light" and perform the «INSPECTION STEPS»(ref-619160-S16379057622014053000000) . A: Go to Next Step
5. Performing diagnosis Diagnose the possible cause based on the list of diagnostic codes. Perform the inspection according to the diagnostic codes. Repair the cause of the fault. Clear the diagnostic codes. Perform the check mode. Check that no other DTC is detected. RESULT Result Go to DTC is detected. A DTC is not detected. B B: Complete the diagnosis. A: Perform the steps ( 1 ) to ( 5 ) of the procedure 5.

Checking/Clearing Diagnostic Codes

1. Reading diagnostic codes with the SSM3 Connect the SSM3 to data link connector. Turn the ignition switch to ON. Select the following menu items using the SSM3: [Each System Check]/[Occupant Detection System]/[Diagnostic Code(s) Display] NOTE: For details on the DTCs, refer to " «LIST OF DIAGNOSTIC CODES»(ref-619208-S17686402912014053000000) ".
2. Clearing diagnostic codes with the SSM3 Connect the SSM3 to data link connector. Turn the ignition switch to ON. Select the following menu items using the SSM3: [Each System Check]/[Occupant Detection System]/[Clear Memory] NOTE: After repairing the airbag system and the occupant detection system, clear the failure codes recorded in the airbag control module and the occupant detection control module.
3. Check mode Refer to the trouble situation on the «CHECK LIST FOR INTERVIEW»(ref-619160-S08194963792014053000000) to reproduce the same situation.

Circuit description

Scheme 286

Inspection steps

Scheme 287

1. Check DTC Read the DTC for the occupant detection system. Criteria: No other DTC is detected. NG: Perform the diagnosis according to the DTC. OK: Go to Next Step
2. Check poor contact of connectors. Check for poor contact of the connectors between the occupant detection control module and the airbag control module. Criteria: No fault is found. NG: Connect the connectors properly. In the case that the fault cannot be corrected, replace the airbag rear harness along with the body harness, or replace the front seat cushion ASSY RH. OK: Go to Next Step
3. Check airbag rear harness. Turn the ignition switch to OFF, disconnect the battery ground terminal, and wait for 60 seconds or more. Disconnect the connector (G2) under the passenger's seat. Disconnect the connector B from the airbag control module, and connect the connector (1AH) in the test harness AH. Connect the connector (2AH) in the test harness AH and the connector (1AG) in the test harness AG. Measure the resistance between the terminals. NOTE: Connect the test harness AS to the connector (G2) and touch the test harness with the tester. RESISTANCE Inspection terminals Inspection conditions Standard value (G2) No. 2 - (5AG) No. 16 Always Less than 10 ohms (G2) No. 3 - (5AG) No. 5 Always Less than 10 ohms Criteria: The same DTC is not displayed. NG: Replace the airbag rear harness along with the body harness. OK: Go to Next Step
4. Check airbag rear harness. Measure the resistance between the terminals. RESISTANCE Inspection terminals Inspection conditions Standard value (5AG) No. 5 - chassis ground Always 1 Mohms or more (5AG) No. 16 - chassis ground Always 1 Mohms or more (5AG) No. 5 - (5AG) No. 16 Always 1 Mohms or more NG: Replace the airbag rear harness along with the body harness. OK: Go to Next Step
5. Check occupant detection harness. Turn the ignition switch to ON. Measure the voltage between the terminals. VOLTAGE Inspection terminals Inspection conditions Standard value (G2) No. 1 - chassis ground IG ON 10 V or more NG: Replace front seat cushion ASSY RH. OK: Check the battery voltage and the fuses. If there is no faulty, replace the airbag rear harness along with the body harness.

Scheme 288

1. Check DTC Read the DTC for the occupant detection system. Criteria: No other DTC is detected. NG: Perform the diagnosis according to the DTC. OK: Go to Next Step
2. Check poor contact of connectors. Check for poor contact of the connectors between the occupant detection control module and the airbag control module. Criteria: No fault is found. NG: Connect the connectors properly. In the case that the fault cannot be corrected, replace the airbag rear harness along with the body harness, or replace the front seat cushion ASSY RH. OK: Go to Next Step
3. Check buckle switch. Turn the ignition switch to OFF, disconnect the battery ground terminal, and wait for 60 seconds or more. Disconnect the buckle switch connector. Connect the test harness AE and the test harness connector Y to the buckle switch connector C. Connect the battery ground terminal and turn the ignition switch to ON. Criteria: The airbag warning light illuminates for 6 seconds, then it goes off. NG: Check the seat harness, and if any fault is found, repair the harness. In the case that the fault cannot be corrected, replace the front seat ASSY RH. OK: Replace the front seat inner belt ASSY RH (seat belt buckle switch RH).

The occupant detection sensor circuit consists of the occupant detection ECM and the occupant detection sensor.

If any fault is detected in the occupant detection sensor circuit, the diagnostic code B1760 will be recorded.

1. Check poor contact of connectors. Turn the ignition switch to OFF. Disconnect the cable from the battery ground terminal. Check that the connector is securely connected to the occupant detection ECM. Criteria: The connector is securely connected. NOTE: If the connector is not securely connected, reconnect it, and proceed to the next check. Disconnect the connector from the occupant detection ECM. Check whether the connector terminal is damaged. Criteria: The terminal is not deformed or damaged. NG: Replace the front seat cushion ASSY RH. OK: Repair the connector. In the case that the fault cannot be corrected, replace the front seat cushion ASSY RH.

DTC B1761 will be detected when the occupant detection sensor is wet.

1. Dry front seat ASSY RH. Leave the vehicle with the windows open in a well-ventilated room for 24 hours to dry the seats. Next
2. Checking diagnostic codes Clear the diagnostic code recorded in the occupant detection ECM. (Refer to «CHECKING/CLEARING DIAGNOSTIC CODES»(ref-619208-S16149543532014053000000) ) Clear the diagnostic code recorded in the airbag sensor ASSY. (Refer to «CHECKING/CLEARING DIAGNOSTIC CODES»(ref-619160-S27561570222014053000000) ) Turn the ignition switch to OFF. Turn the ignition switch to ON. Check whether a diagnostic code is recorded. (Refer to «CHECKING/CLEARING DIAGNOSTIC CODES»(ref-619208-S16149543532014053000000) ) Criteria: The diagnostic code B1761 is not output. NOTE: At this point, any diagnostic codes other than B1761 may be output. However, these codes are not related to this check. NG: Replace front seat cushion ASSY RH. OK: Complete

The passenger's seat buckle switch circuit consists of the occupant detection ECM and the front seat inner belt ASSY RH.

If any fault is found in the passenger's seat buckle switch circuit, the diagnostic code B1771 will be recorded.

Note. In the case that the diagnostic code B1650 is detected as a result of troubleshooting of the air bag system, check the diagnostic code recorded in the occupant detection ECM. In the case that the diagnostic code B1771 is output, perform the troubleshooting procedures for this diagnostic code.

Scheme 289

Perform the diagnosis procedures from step 2 of "DTC B1655 Front buckle switch RH failure."

If any fault is found in the occupant detection ECM, the diagnostic code B1795 will be recorded.

Note. In the case that the diagnostic code B1650 is detected as a result of troubleshooting of the air bag system, check the diagnostic code recorded in the occupant detection ECM. In the case that the diagnostic code B1795 is output, perform the troubleshooting procedures for this diagnostic code.

1. Replace front seat cushion ASSY RH. Turn the ignition switch to OFF. Disconnect the cable from the battery ground terminal. Replace the front seat inner belt ASSY RH. Connect the cable to the battery ground terminal. Next: Complete