Occupant Classification System (diagnostic Codes & Circuit Tests) (except Phv) Toyota Prius PHV pre-III

DESCRIPTION

The passenger side buckle switch circuit consists of the occupant classification ECU and front seat inner belt assembly RH.

DTC B1771 is stored when a malfunction is detected in the passenger side buckle switch circuit.

HINT

When DTC B1650/32 is detected as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant classification ECU. When DTC B1771 is output, perform troubleshooting for the DTC.

Scheme 36

INSPECTION PROCEDURE

HINT

1. If troubleshooting (wire harness inspection) is difficult to perform, remove the front passenger seat installation bolts to see under the seat cushion.
2. In the above case, hold the seat so that it does not fall down. Hold the seat only as necessary because holding the seat for a long period of time may cause seat rail deformation.

Scheme 37

Scheme 38

1. CHECK CONNECTORS Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. Check that the connectors are properly connected to the occupant classification ECU and front seat inner belt assembly RH. OK The connectors are properly connected. HINT: If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection. Disconnect the connectors from the occupant classification ECU and front seat inner belt assembly RH. Check that the terminals of connectors are not damaged. OK The terminals are not deformed or damaged. NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
2. CHECK FRONT SEAT WIRE RH (SHORT TO B+) Connect the cable to the negative (-) battery terminal. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition W3-9 (BSW) - Body ground Power switch on (IG) Below 1 V W3-5 (BGND) - Body ground Power switch on (IG) Below 1 V TEXT IN ILLUSTRATION *1 Front Seat Inner Belt Assembly RH *2 Occupant Classification ECU *3 Front Seat Wire RH *4 Front view of wire harness connector (to Occupant Classification ECU) *5 Connector B NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
3. CHECK FRONT SEAT WIRE RH (OPEN) Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. Using SST, connect terminals 1 (BSW) and 2 (BGND) of connector C. NOTE: Do not forcibly insert SST into the terminals of the connector when connecting. SST: 09843-18040 Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition W3-9 (BSW) - W3-5 (BGND) Always Below 1 ohms TEXT IN ILLUSTRATION *1 Front Seat Inner Belt Assembly RH *2 Occupant Classification ECU *3 Front Seat Wire RH *4 Front view of wire harness connector (to Occupant Classification ECU) *5 Front view of wire harness connector (to Front Seat Inner Belt Assembly RH) *6 Connector B *7 Connector C - - NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
4. CHECK FRONT SEAT WIRE RH (SHORT) Disconnect SST from connector C. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition W3-9 (BSW) - W3-5 (BGND) Always 1 Mohms or higher TEXT IN ILLUSTRATION *1 Front Seat Inner Belt Assembly RH *2 Occupant Classification ECU *3 Front Seat Wire RH *4 Front view of wire harness connector (to Occupant Classification ECU) *5 Connector B NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
5. CHECK FRONT SEAT WIRE RH (SHORT TO GROUND) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition W3-9 (BSW) - Body ground Always 1 Mohms or higher W3-5 (BGND) - Body ground Always 1 Mohms or higher TEXT IN ILLUSTRATION *1 Front Seat Inner Belt Assembly RH *2 Occupant Classification ECU *3 Front Seat Wire RH *4 Front view of wire harness connector (to Occupant Classification ECU) *5 Connector B NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
6. CHECK DTC Connect the connectors to the occupant classification ECU and front seat inner belt assembly RH. Connect the cable to the negative (-) battery terminal. Turn the power switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__dtc-checkclear) . Clear the DTCs stored in the center airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/airbag/#airbag-system-diagnostics-introduction-except-phv) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__dtc-checkclear) . OK DTC B1771 is not output. HINT: Codes other than DTC B1771 may be output at this time, but they are not related to this check. NG --> See step 7 OK --> See step 11
7. REPLACE FRONT SEAT INNER BELT ASSEMBLY RH Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. Replace the front seat inner belt assembly RH. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#seat-belt-service-information-except-phv) . HINT: Perform the inspection using parts from a normal vehicle if possible. Connect the cable to the negative (-) battery terminal. Turn the power switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__dtc-checkclear) . Clear the DTCs stored in the center airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/airbag/#airbag-system-diagnostics-introduction-except-phv) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__dtc-checkclear) . OK DTC B1771 is not output. HINT: Codes other than DTC B1771 may be output at this time, but they are not related to this check. NG --> See step 8 OK --> END
8. REPLACE OCCUPANT CLASSIFICATION ECU Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. Replace the occupant classification ECU. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/airbag/#supplemental-restraint-system-service-information-except-phv) . NEXT: Go to next step
9. PERFORM ZERO POINT CALIBRATION Connect the cable to the negative (-) battery terminal. Connect the Techstream to the DLC3. Turn the power switch on (IG). Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . OK "Zero Point Calibration is complete." is displayed. NEXT: Go to next step
10. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . Standard 27 to 33 kg (59.5 to 72.8 lb) NEXT --> END
11. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv)

The front occupant classification sensor LH circuit consists of the occupant classification ECU and front occupant classification sensor LH.

DTC B1780 is stored when a malfunction is detected in the front occupant classification sensor LH circuit.

HINT

When DTC B1650/32 is detected as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant classification ECU. When DTC B1780 is output, perform troubleshooting for the DTC.

Scheme 39

HINT

1. If troubleshooting (wire harness inspection) is difficult to perform, remove the front passenger seat installation bolts to see under the seat cushion.
2. In the above case, hold the seat so that it does not fall down. Hold the seat only as necessary because holding the seat for a long period of time may cause seat rail deformation.

Scheme 40

Scheme 41

1. CHECK CONNECTORS Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. Check that the connectors are properly connected to the occupant classification ECU and front occupant classification sensor LH. OK The connectors are properly connected. HINT: If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection. Disconnect the connectors from the occupant classification ECU and front occupant classification sensor LH. Check that the terminals of connectors are not damaged. OK The terminals are not deformed or damaged. NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
2. CHECK FRONT SEAT WIRE RH (SHORT TO B+) Connect the cable to the negative (-) battery terminal. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition W2-1 (SGD1) - Body ground Power switch on (IG) Below 1 V W2-7 (SIG1) - Body ground Power switch on (IG) Below 1 V W2-11 (SVC1) - Body ground Power switch on (IG) Below 1 V TEXT IN ILLUSTRATION *1 Front Occupant Classification Sensor LH *2 Occupant Classification ECU *3 Front Seat Wire RH *4 Front view of wire harness connector (to Occupant Classification ECU) *5 Connector B NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
3. CHECK FRONT SEAT WIRE RH (OPEN) Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. Using SST, connect terminals 1 (SVC1) and 3 (SGD1), and connect terminals 2 (SIG1) and 3 (SGD1) of connector C. NOTE: Do not forcibly insert SST into the terminals of the connector when connecting. SST: 09843-18040 Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition W2-7 (SIG1) - W2-1 (SGD1) Always Below 1 ohms W2-11 (SVC1) - W2-1 (SGD1) Always Below 1 ohms TEXT IN ILLUSTRATION *1 Front Occupant Classification Sensor LH *2 Occupant Classification ECU *3 Front Seat Wire RH *4 Front view of wire harness connector (to Occupant Classification ECU) *5 Front view of wire harness connector (to Front Occupant Classification Sensor LH) *6 Connector B *7 Connector C - - NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
4. CHECK FRONT SEAT WIRE RH (SHORT) Disconnect SST from connector C. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition W2-7 (SIG1) - W2-1 (SGD1) Always 1 Mohms or higher W2-11 (SVC1) - W2-1 (SGD1) Always 1 Mohms or higher W2-7 (SIG1) - W2-11 (SVC1) Always 1 Mohms or higher TEXT IN ILLUSTRATION *1 Front Occupant Classification Sensor LH *2 Occupant Classification ECU *3 Front Seat Wire RH *4 Front view of wire harness connector (to Occupant Classification ECU) *5 Connector B NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
5. CHECK FRONT SEAT WIRE RH (SHORT TO GROUND) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition W2-1 (SGD1) - Body ground Always 1 Mohms or higher W2-7 (SIG1) - Body ground Always 1 Mohms or higher W2-11 (SVC1) - Body ground Always 1 Mohms or higher TEXT IN ILLUSTRATION *1 Front Occupant Classification Sensor LH *2 Occupant Classification ECU *3 Front Seat Wire RH *4 Front view of wire harness connector (to Occupant Classification ECU) *5 Connector B NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
6. CHECK DTC Connect the connectors to the occupant classification ECU and front occupant classification sensor LH. Connect the cable to the negative (-) battery terminal. Turn the power switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__dtc-checkclear) . Clear the DTCs stored in the center airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/airbag/#airbag-system-diagnostics-introduction-except-phv) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__dtc-checkclear) . OK DTC B1780 is not output. HINT: Codes other than DTC B1780 may be output at this time, but they are not related to this check. NG --> See step 7 OK --> See step 10
7. REPLACE FRONT SEAT CUSHION SPRING ASSEMBLY Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. Replace the front seat cushion spring assembly. Refer to «DISASSEMBLY»(/toyota/prius-phv/pre-iii-2010-2011/remont/seats/#seat-service-information-except-phv) . NEXT: Go to next step
8. PERFORM ZERO POINT CALIBRATION Connect the cable to the negative (-) battery terminal. Connect the Techstream to the DLC3. Turn the power switch on (IG). Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . OK "Zero Point Calibration is complete." is displayed. NEXT: Go to next step
9. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . Standard 27 to 33 kg (59.5 to 72.8 lb) NEXT --> END
10. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv)

The front occupant classification sensor RH circuit consists of the occupant classification ECU and front occupant classification sensor RH.

DTC B1781 is stored when a malfunction is detected in the front occupant classification sensor RH circuit.

HINT

When DTC B1650/32 is detected as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant classification ECU. When DTC B1781 is output, perform troubleshooting for the DTC.

Scheme 42

HINT

1. If troubleshooting (wire harness inspection) is difficult to perform, remove the front passenger seat installation bolts to see under the seat cushion.
2. In the above case, hold the seat so that it does not fall down. Hold the seat only as necessary because holding the seat for a long period of time may cause seat rail deformation.

Scheme 43

Scheme 44

1. CHECK CONNECTORS Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. Check that the connectors are properly connected to the occupant classification ECU and front occupant classification sensor RH. OK The connectors are properly connected. HINT: If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection. Disconnect the connectors from the occupant classification ECU and front occupant classification sensor RH. Check that the terminals of connectors are not damaged. OK The terminals are not deformed or damaged. NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
2. CHECK FRONT SEAT WIRE RH (SHORT TO B+) Connect the cable to the negative (-) battery terminal. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition W2-2 (SGD2) - Body ground Power switch on (IG) Below 1 V W2-8 (SIG2) - Body ground Power switch on (IG) Below 1 V W2-12 (SVC2) - Body ground Power switch on (IG) Below 1 V TEXT IN ILLUSTRATION *1 Front Occupant Classification Sensor RH *2 Occupant Classification ECU *3 Front Seat Wire RH *4 Front view of wire harness connector (to Occupant Classification ECU) *5 Connector B NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
3. CHECK FRONT SEAT WIRE RH (OPEN) Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. Using SST, connect terminals 1 (SVC2) and 3 (SGD2), and connect terminals 2 (SIG2) and 3 (SGD2) of connector C. NOTE: Do not forcibly insert SST into the terminals of the connector when connecting. SST: 09843-18040 Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition W2-8 (SIG2) - W2-2 (SGD2) Always Below 1 ohms W2-12 (SVC2) - W2-2 (SGD2) Always Below 1 ohms TEXT IN ILLUSTRATION *1 Front Occupant Classification Sensor RH *2 Occupant Classification ECU *3 Front Seat Wire RH *4 Front view of wire harness connector (to Occupant Classification ECU) *5 Front view of wire harness connector (to Front Occupant Classification Sensor RH) *6 Connector B *7 Connector C - - NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
4. CHECK FRONT SEAT WIRE RH (SHORT) Disconnect SST from connector C. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition W2-8 (SIG2) - W2-2 (SGD2) Always 1 Mohms or higher W2-12 (SVC2) - W2-2 (SGD2) Always 1 Mohms or higher W2-8 (SIG2) - W2-12 (SVC2) Always 1 Mohms or higher TEXT IN ILLUSTRATION *1 Front Occupant Classification Sensor RH *2 Occupant Classification ECU *3 Front Seat Wire RH *4 Front view of wire harness connector (to Occupant Classification ECU) *5 Connector B NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
5. CHECK FRONT SEAT WIRE RH (SHORT TO GROUND) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition W2-2 (SGD2) - Body ground Always 1 Mohms or higher W2-8 (SIG2) - Body ground Always 1 Mohms or higher W2-12 (SVC2) - Body ground Always 1 Mohms or higher TEXT IN ILLUSTRATION *1 Front Occupant Classification Sensor RH *2 Occupant Classification ECU *3 Front Seat Wire RH *4 Front view of wire harness connector (to Occupant Classification ECU) *5 Connector B NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
6. CHECK DTC Connect the connectors to the occupant classification ECU and front occupant classification sensor RH. Connect the cable to the negative (-) battery terminal. Turn the power switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__dtc-checkclear) . Clear the DTCs stored in the center airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__dtc-checkclear) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/airbag/#airbag-system-diagnostics-introduction-except-phv) . OK DTC B1781 is not output. HINT: Codes other than DTC B1781 may be output at this time, but they are not related to this check. NG --> See step 7 OK --> See step 10
7. REPLACE FRONT SEAT CUSHION SPRING ASSEMBLY Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. Replace the front seat cushion spring assembly. Refer to «DISASSEMBLY»(/toyota/prius-phv/pre-iii-2010-2011/remont/seats/#seat-service-information-except-phv) . NEXT: Go to next step
8. PERFORM ZERO POINT CALIBRATION Connect the cable to the negative (-) battery terminal. Connect the Techstream to the DLC3. Turn the power switch on (IG). Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . OK "Zero Point Calibration is complete." is displayed. NEXT: Go to next step
9. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . Standard 27 to 33 kg (59.5 to 72.8 lb) NEXT --> END
10. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv)

The rear occupant classification sensor LH circuit consists of the occupant classification ECU and rear occupant classification sensor LH.

DTC B1782 is stored when a malfunction is detected in the rear occupant classification sensor LH circuit.

HINT

When DTC B1650/32 is detected as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant classification ECU. When DTC B1782 is output, perform troubleshooting for the DTC.

Scheme 45

HINT

1. If troubleshooting (wire harness inspection) is difficult to perform, remove the front passenger seat installation bolts to see under the seat cushion.
2. In the above case, hold the seat so that it does not fall down. Hold the seat only as necessary because holding the seat for a long period of time may cause seat rail deformation.

Scheme 46

Scheme 47

1. CHECK CONNECTORS Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. Check that the connectors are properly connected to the occupant classification ECU and rear occupant classification sensor LH. OK The connectors are properly connected. HINT: If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection. Disconnect the connectors from the occupant classification ECU and rear occupant classification sensor LH. Check that the terminals of connectors are not damaged. OK The terminals are not deformed or damaged. NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
2. CHECK FRONT SEAT WIRE RH (SHORT TO B+) Connect the cable to the negative (-) battery terminal. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition W2-3 (SGD3) - Body ground Power switch on (IG) Below 1 V W2-5 (SVC3) - Body ground Power switch on (IG) Below 1 V W2-9 (SIG3) - Body ground Power switch on (IG) Below 1 V TEXT IN ILLUSTRATION *1 Rear Occupant Classification Sensor LH *2 Occupant Classification ECU *3 Front Seat Wire RH *4 Front view of wire harness connector (to Occupant Classification ECU) *5 Connector B NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
3. CHECK FRONT SEAT WIRE RH (OPEN) Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. Using SST, connect terminals 1 (SVC3) and 3 (SGD3), and connect terminals 2 (SIG3) and 3 (SGD3) of connector C. NOTE: Do not forcibly insert SST into the terminals of the connector when connecting. SST: 09843-18040 Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition W2-5 (SVC3) - W2-3 (SGD3) Always Below 1 ohms W2-9 (SIG3) - W2-3 (SGD3) Always Below 1 ohms TEXT IN ILLUSTRATION *1 Rear Occupant Classification Sensor LH *2 Occupant Classification ECU *3 Front Seat Wire RH *4 Front view of wire harness connector (to Occupant Classification ECU) *5 Front view of wire harness connector (to Rear Occupant Classification Sensor LH) *6 Connector B *7 Connector C - - NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
4. CHECK FRONT SEAT WIRE RH (SHORT) Disconnect SST from connector C. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition W2-5 (SVC3) - W2-3 (SGD3) Always 1 Mohms or higher W2-9 (SIG3) - W2-3 (SGD3) Always 1 Mohms or higher W2-5 (SVC3) - W2-9 (SIG3) Always 1 Mohms or higher TEXT IN ILLUSTRATION *1 Rear Occupant Classification Sensor LH *2 Occupant Classification ECU *3 Front Seat Wire RH *4 Front view of wire harness connector (to Occupant Classification ECU) *5 Connector B NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
5. CHECK FRONT SEAT WIRE RH (SHORT TO GROUND) Measure the resistance according to value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition W2-3 (SGD3) - Body ground Always 1 Mohms or higher W2-5 (SVC3) - Body ground Always 1 Mohms or higher W2-9 (SIG3) - Body ground Always 1 Mohms or higher TEXT IN ILLUSTRATION *1 Rear Occupant Classification Sensor LH *2 Occupant Classification ECU *3 Front Seat Wire RH *4 Front view of wire harness connector (to Occupant Classification ECU) *5 Connector B NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
6. CHECK DTC Connect the connectors to the occupant classification ECU and rear occupant classification sensor LH. Connect the cable to the negative (-) battery terminal. Turn the power switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__dtc-checkclear) . Clear the DTCs stored in the center airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__dtc-checkclear) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/airbag/#airbag-system-diagnostics-introduction-except-phv) . OK DTC B1782 is not output. HINT: Codes other than DTC B1782 may be output at this time, but they are not related to this check. NG --> See step 7 OK --> See step 10
7. REPLACE FRONT SEAT CUSHION SPRING ASSEMBLY Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. Replace the front seat cushion spring assembly. Refer to «DISASSEMBLY»(/toyota/prius-phv/pre-iii-2010-2011/remont/seats/#seat-service-information-except-phv) . NEXT: Go to next step
8. PERFORM ZERO POINT CALIBRATION Connect the cable to the negative (-) battery terminal. Connect the Techstream to the DLC3. Turn the power switch on (IG). Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . OK "Zero Point Calibration is complete." is displayed. NEXT: Go to next step
9. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . Standard 27 to 33 kg (59.5 to 72.8 lb) NEXT --> END
10. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv)

The rear occupant classification sensor RH circuit consists of the occupant classification ECU and rear occupant classification sensor RH.

DTC B1783 is stored when a malfunction is detected in the rear occupant classification sensor RH circuit.

HINT

When DTC B1650/32 is detected as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant classification ECU. When DTC B1783 is output, perform troubleshooting for the DTC.

Scheme 48

HINT

1. If troubleshooting (wire harness inspection) is difficult to perform, remove the front passenger seat installation bolts to see under the seat cushion.
2. In the above case, hold the seat so that it does not fall down. Hold the seat only as necessary because holding the seat for a long period of time may cause seat rail deformation.

Scheme 49

Scheme 50

1. CHECK CONNECTORS Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. Check that the connectors are properly connected to the occupant classification ECU and rear occupant classification sensor RH. OK The connectors are properly connected. HINT: If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection. Disconnect the connectors from the occupant classification ECU and rear occupant classification sensor RH. Check that the terminals of connectors are not damaged. OK The terminals are not deformed or damaged. NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
2. CHECK FRONT SEAT WIRE RH (SHORT TO B+) Connect the cable to the negative (-) battery terminal. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition W2-4 (SGD4) - Body ground Power switch on (IG) Below 1 V W2-6 (SVC4) - Body ground Power switch on (IG) Below 1 V W2-10 (SIG4) - Body ground Power switch on (IG) Below 1 V TEXT IN ILLUSTRATION *1 Rear Occupant Classification Sensor RH *2 Occupant Classification ECU *3 Front Seat Wire RH *4 Front view of wire harness connector (to Occupant Classification ECU) *5 Connector B NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
3. CHECK FRONT SEAT WIRE RH (OPEN) Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. Using SST, connect terminals 1 (SVC4) and 3 (SGD4), and connect terminals 2 (SIG4) and 3 (SGD4) of connector C. NOTE: Do not forcibly insert SST into the terminals of the connector when connecting. SST: 09843-18040 Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition W2-6 (SVC4) - W2-4 (SGD4) Always Below 1 ohms W2-10 (SIG4) - W2-4 (SGD4) Always Below 1 ohms TEXT IN ILLUSTRATION *1 Rear Occupant Classification Sensor RH *2 Occupant Classification ECU *3 Front Seat Wire RH *4 Front view of wire harness connector (to Occupant Classification ECU) *5 Front view of wire harness connector (to Rear Occupant Classification Sensor RH) *6 Connector B *7 Connector C - - NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
4. CHECK FRONT SEAT WIRE RH (SHORT) Disconnect SST from connector C. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition W2-6 (SVC4) - W2-4 (SGD4) Always 1 Mohms or higher W2-10 (SIG4) - W2-4 (SGD4) Always 1 Mohms or higher W2-6 (SVC4) - W2-10 (SIG4) Always 1 Mohms or higher TEXT IN ILLUSTRATION *1 Rear Occupant Classification Sensor RH *2 Occupant Classification ECU *3 Front Seat Wire RH *4 Front view of wire harness connector (to Occupant Classification ECU) *5 Connector B NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
5. CHECK FRONT SEAT WIRE RH (SHORT TO GROUND) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition W2-4 (SGD4) - Body ground Always 1 Mohms or higher W2-6 (SVC4) - Body ground Always 1 Mohms or higher W2-10 (SIG4) - Body ground Always 1 Mohms or higher TEXT IN ILLUSTRATION *1 Rear Occupant Classification Sensor RH *2 Occupant Classification ECU *3 Front Seat Wire RH *4 Front view of wire harness connector (to Occupant Classification ECU) *5 Connector B NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
6. CHECK DTC Connect the connectors to the occupant classification ECU and rear occupant classification sensor RH. Connect the cable to the negative (-) battery terminal. Turn the power switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__dtc-checkclear) . Clear the DTCs stored in the center airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__dtc-checkclear) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/airbag/#airbag-system-diagnostics-introduction-except-phv) . OK DTC B1783 is not output. HINT: Codes other than DTC B1783 may be output at this time, but they are not related to this check. NG --> See step 7 OK --> See step 10
7. REPLACE FRONT SEAT CUSHION SPRING ASSEMBLY Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. Replace the front seat cushion spring assembly. Refer to «DISASSEMBLY»(/toyota/prius-phv/pre-iii-2010-2011/remont/seats/#seat-service-information-except-phv) . NEXT: Go to next step
8. PERFORM ZERO POINT CALIBRATION Connect the cable to the negative (-) battery terminal. Connect the Techstream to the DLC3. Turn the power switch on (IG). Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . OK "Zero Point Calibration is complete." is displayed. NEXT: Go to next step
9. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . Standard 27 to 33 kg (59.5 to 72.8 lb) NEXT --> END
10. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv)

DTC B1785 is stored when the occupant classification ECU receives a collision detection signal sent by the front occupant classification sensor LH if an accident occurs.

DTC B1785 is also stored when the front seat assembly RH is subjected to a strong impact, even if an actual accident does not occur.

If the vehicle is not in a collision, but the occupant classification ECU outputs a collision detection signal and sets DTC B1785, the DTC can be cleared by performing Zero Point Calibration and Sensitivity Check.

Therefore, if DTC B1785 is output, first perform Zero Point Calibration and Sensitivity Check.

HINT

When DTC B1650/32 is detected as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant classification ECU. When DTC B1785 is output, perform troubleshooting for the DTC.

PROCEDURE

1. PERFORM ZERO POINT CALIBRATION Connect the Techstream to the DLC3. Turn the power switch on (IG). Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . OK "Zero Point Calibration is complete." is displayed. NG --> See step 3 OK: Go to next step
2. CHECK DTC Turn the power switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__dtc-checkclear) . Clear the DTCs stored in the center airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__dtc-checkclear) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/airbag/#airbag-system-diagnostics-introduction-except-phv) . OK DTC B1785 is not output. HINT: Codes other than DTC B1785 may be output at this time, but they are not related to this check. RESULT Result Proceed to NG A OK B B --> See step 5 A: Go to next step
3. REPLACE FRONT SEAT CUSHION SPRING ASSEMBLY Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. Replace the front seat cushion spring assembly. Refer to «DISASSEMBLY»(/toyota/prius-phv/pre-iii-2010-2011/remont/seats/#seat-service-information-except-phv) . NEXT: Go to next step
4. PERFORM ZERO POINT CALIBRATION Connect the cable to the negative (-) battery terminal. Connect the Techstream to the DLC3. Turn the power switch on (IG). Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . OK "Zero Point Calibration is complete." is displayed. NEXT: Go to next step
5. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . Standard 27 to 33 kg (59.5 to 72.8 lb) NEXT --> END

DTC B1786 is stored when the occupant classification ECU receives a collision detection signal sent by the front occupant classification sensor RH if an accident occurs.

DTC B1786 is also stored when the front seat assembly RH is subjected to a strong impact, even if an actual accident does not occur.

If the vehicle is not in a collision, but the occupant classification ECU outputs a collision detection signal and sets DTC B1786, the DTC can be cleared by performing Zero Point Calibration and Sensitivity Check.

Therefore, if DTC B1786 is output, first perform Zero Point Calibration and Sensitivity Check.

HINT

When DTC B1650/32 is detected as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant classification ECU. When DTC B1786 is output, perform troubleshooting for the DTC.

1. PERFORM ZERO POINT CALIBRATION Connect the Techstream to the DLC3. Turn the power switch on (IG). Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . OK "Zero Point Calibration is complete." is displayed. NG --> See step 3 OK: Go to next step
2. CHECK DTC Turn the power switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__dtc-checkclear) . Clear the DTCs stored in the center airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__dtc-checkclear) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/airbag/#airbag-system-diagnostics-introduction-except-phv) . OK DTC B1786 is not output. HINT: Codes other than DTC B1786 may be output at this time, but they are not related to this check. RESULT Result Proceed to NG A OK B B --> See step 5 A: Go to next step
3. REPLACE FRONT SEAT CUSHION SPRING ASSEMBLY Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. Replace the front seat cushion spring assembly. Refer to «DISASSEMBLY»(/toyota/prius-phv/pre-iii-2010-2011/remont/seats/#seat-service-information-except-phv) . NEXT: Go to next step
4. PERFORM ZERO POINT CALIBRATION Connect the cable to the negative (-) battery terminal. Connect the Techstream to the DLC3. Turn the power switch on (IG). Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . OK "Zero Point Calibration is complete." is displayed. NEXT: Go to next step
5. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . Standard 27 to 33 kg (59.5 to 72.8 lb) NEXT --> END

DTC B1787 is stored when the occupant classification ECU receives a collision detection signal sent by the rear occupant classification sensor LH if an accident occurs.

DTC B1787 is also stored when the front seat assembly RH is subjected to a strong impact, even if an actual accident does not occur.

If the vehicle is not in a collision, but the occupant classification ECU outputs a collision detection signal and sets DTC B1787, the DTC can be cleared by performing Zero Point Calibration and Sensitivity Check.

Therefore, if DTC B1787 is output, first perform Zero Point Calibration and Sensitivity Check.

HINT

When DTC B1650/32 is detected as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant classification ECU. When DTC B1787 is output, perform troubleshooting for the DTC.

1. PERFORM ZERO POINT CALIBRATION Connect the Techstream to the DLC3. Turn the power switch on (IG). Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . OK "Zero Point Calibration is complete." is displayed. NG --> See step 3 OK: Go to next step
2. CHECK DTC Turn the power switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__dtc-checkclear) . Clear the DTCs stored in the center airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/airbag/#airbag-system-diagnostics-introduction-except-phv) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__dtc-checkclear) . OK DTC B1787 is not output. HINT: Codes other than DTC B1787 may be output at this time, but they are not related to this check. RESULT Result Proceed to NG A OK B B --> See step 5 A: Go to next step
3. REPLACE FRONT SEAT CUSHION SPRING ASSEMBLY Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. Replace the front seat cushion spring assembly. Refer to «DISASSEMBLY»(/toyota/prius-phv/pre-iii-2010-2011/remont/seats/#seat-service-information-except-phv) . NEXT: Go to next step
4. PERFORM ZERO POINT CALIBRATION Connect the cable to the negative (-) battery terminal. Connect the Techstream to the DLC3. Turn the power switch on (IG). Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . OK "Zero Point Calibration is complete." is displayed. NEXT: Go to next step
5. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . Standard 27 to 33 kg (59.5 to 72.8 lb) NEXT --> END

DTC B1788 is stored when the occupant classification ECU receives a collision detection signal sent by the rear occupant classification sensor RH if an accident occurs.

DTC B1788 is also stored when the front seat assembly RH is subjected to a strong impact, even if an actual accident does not occur.

If the vehicle is not in a collision, but the occupant classification ECU outputs a collision detection signal and sets DTC B1788, the DTC can be cleared by performing the Zero Point Calibration and Sensitivity Check.

Therefore, if DTC B1788 is output, first perform Zero Point Calibration and Sensitivity Check.

HINT

When DTC B1650/32 is detected as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant classification ECU. When DTC B1788 is output, perform troubleshooting for the DTC.

1. PERFORM ZERO POINT CALIBRATION Connect the Techstream to the DLC3. Turn the power switch on (IG). Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . OK "Zero Point Calibration is complete." is displayed. NG --> See step 3 OK: Go to next step
2. CHECK DTC Turn the power switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__dtc-checkclear) . Clear the DTCs stored in the center airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/airbag/#airbag-system-diagnostics-introduction-except-phv) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__dtc-checkclear) . OK DTC B1788 is not output. HINT: Codes other than DTC B1788 may be output at this time, but they are not related to this check. RESULT Result Proceed to NG A OK B B --> See step 5 A: Go to next step
3. REPLACE FRONT SEAT CUSHION SPRING ASSEMBLY Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. Replace the front seat cushion spring assembly. Refer to «DISASSEMBLY»(/toyota/prius-phv/pre-iii-2010-2011/remont/seats/#seat-service-information-except-phv) . NEXT: Go to next step
4. PERFORM ZERO POINT CALIBRATION Connect the cable to the negative (-) battery terminal. Connect the Techstream to the DLC3. Turn the power switch on (IG). Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . OK "Zero Point Calibration is complete." is displayed. OK: Go to next step
5. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . Standard 27 to 33 kg (59.5 to 72.8 lb) NEXT --> END

The center airbag sensor assembly communication circuit consists of the occupant classification ECU and center airbag sensor assembly.

DTC B1790 is stored when a malfunction is detected in the center airbag sensor assembly communication circuit.

HINT

When DTC B1650/32 is detected as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant classification ECU. When DTC B1790 is output, perform troubleshooting for the DTC.

Scheme 51

HINT

1. If troubleshooting (wire harness inspection) is difficult to perform, remove the front passenger seat installation bolts to see under the seat cushion.
2. In the above case, hold the seat so that it does not fall down. Hold the seat only as necessary because holding the seat for a long period of time may cause seat rail deformation.

Scheme 52

Scheme 53

Scheme 54

Scheme 55

1. CHECK CONNECTORS Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. WARNING: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system. Check that the connectors are properly connected to the center airbag sensor assembly and occupant classification ECU. Also check that the connectors that link the front seat wire RH and No. 2 floor wire are properly connected. OK The connectors are properly connected. HINT: If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection. Disconnect the connectors from the center airbag sensor assembly and occupant classification ECU. Also disconnect the connectors that link the front seat wire RH and No. 2 floor wire. Check that the terminals of connectors are not damaged. OK The terminals are not deformed or damaged. NG --> REPLACE WIRE HARNESS OK: Go to next step
2. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (SHORT TO B+) Connect the cable to the negative (-) battery terminal. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition W3-8 (FSR+) - Body ground Power switch on (IG) Below 1 V W3-4 (FSR-) - Body ground Power switch on (IG) Below 1 V TEXT IN ILLUSTRATION *1 Occupant Classification ECU *2 Center Airbag Sensor Assembly *3 Front view of wire harness connector (to Occupant Classification ECU) *4 Connector E NG --> See step 11 OK: Go to next step
3. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (OPEN) Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. WARNING: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system. Using SST, connect terminals 12 (FSR+) and 13 (FSR-) of connector B. NOTE: Do not forcibly insert SST into the terminals of the connector when connecting. SST: 09843-18040 Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition W3-8 (FSR+) - W3-4 (FSR-) Always Below 1 ohms TEXT IN ILLUSTRATION *1 Occupant Classification ECU *2 Center Airbag Sensor Assembly *3 Front view of wire harness connector (to Center Airbag Sensor Assembly) *4 Front view of wire harness connector (to Occupant Classification ECU) *5 Connector B *6 Connector E NG --> See step 12 OK: Go to next step
4. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (SHORT) Disconnect SST from connector B. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition W3-8 (FSR+) - W3-4 (FSR-) Always 1 Mohms or higher TEXT IN ILLUSTRATION *1 Occupant Classification ECU *2 Center Airbag Sensor Assembly *3 Front view of wire harness connector (to Occupant Classification ECU) *4 Connector E NG --> See step 13 OK: Go to next step
5. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (SHORT TO GROUND) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition W3-8 (FSR+) - Body ground Always 1 Mohms or higher W3-4 (FSR-) - Body ground Always 1 Mohms or higher TEXT IN ILLUSTRATION *1 Occupant Classification ECU *2 Center Airbag Sensor Assembly *3 Front view of wire harness connector (to Occupant Classification ECU) *4 Connector E NG --> See step 14 OK: Go to next step
6. CHECK DTC Connect the connectors to the occupant classification ECU and center airbag sensor assembly. Connect the Techstream to the DLC3. Connect the cable to the negative (-) battery terminal. Turn the power switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/airbag/#airbag-system-diagnostics-introduction-except-phv) . Clear the DTCs stored in the center airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__dtc-checkclear) . Turn the power switch off. Turn the power switch on (IG). Using the Techstream, check for DTCs of the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__dtc-checkclear) . OK DTC B1790 is not output. HINT: Codes other than DTC B1790 may be output at this time, but they are not related to this check. NG --> See step 7 OK --> See step 15
7. REPLACE OCCUPANT CLASSIFICATION ECU Turn the power switch off. Disconnect the cable from the negative (-) battery terminals. WARNING: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system. Replace the occupant classification ECU. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/airbag/#supplemental-restraint-system-service-information-except-phv) . HINT: Perform the inspection using parts from a normal vehicle if possible. NEXT: Go to next step
8. RECHECK DTC Turn the power switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__dtc-checkclear) . Clear the DTCs stored in the center airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/airbag/#airbag-system-diagnostics-introduction-except-phv) . Turn the power switch off. Turn the power switch on (IG). Using the Techstream, check for DTCs of the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__dtc-checkclear) . OK DTC B1790 is not output. HINT: Codes other than DTC B1790 may be output at this time, but they are not related to this check. NG --> See step 16 OK: Go to next step
9. PERFORM ZERO POINT CALIBRATION Connect the cable to the negative (-) battery terminal. Connect the Techstream to the DLC3. Turn the power switch on (IG). Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . OK "Zero Point Calibration is complete." is displayed. NEXT: Go to next step
10. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . Standard 27 to 33 kg (59.5 to 72.8 lb) NEXT --> END
11. CHECK NO. 2 FLOOR WIRE (SHORT TO B+) Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. WARNING: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system. Disconnect the front seat wire RH connector from the No. 2 floor wire. Connect the cable to the negative (-) battery terminal. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition SW1-1 (FSR+) - Body ground Power switch on (IG) Below 1 V SW1-4 (FSR-) - Body ground Power switch on (IG) Below 1 V TEXT IN ILLUSTRATION *1 Occupant Classification ECU *2 Center Airbag Sensor Assembly *3 Front Seat Wire RH *4 No. 2 Floor Wire *5 Front view of wire harness connector (to Front Seat Wire RH) *6 Connector C NG --> REPLACE NO. 2 FLOOR WIRE OK --> REPLACE FRONT SEAT WIRE RH
12. CHECK NO. 2 FLOOR WIRE (OPEN) Disconnect the front seat wire RH connector from the No. 2 floor wire. HINT: SST has already been inserted into connector B. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition SW1-1 (FSR+) - SW1-4 (FSR-) Always Below 1 ohms TEXT IN ILLUSTRATION *1 Occupant Classification ECU *2 Center Airbag Sensor Assembly *3 Front Seat Wire RH *4 No. 2 Floor Wire *5 Front view of wire harness connector (to Center Airbag Sensor Assembly) *6 Front view of wire harness connector (to Front Seat Wire RH) *7 Connector B *8 Connector C NG --> REPLACE NO. 2 FLOOR WIRE OK --> REPLACE FRONT SEAT WIRE RH
13. CHECK NO. 2 FLOOR WIRE (SHORT) Disconnect the front seat wire RH connector from the No. 2 floor wire. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition SW1-1 (FSR+) - SW1-4 (FSR-) Always 1 Mohms or higher TEXT IN ILLUSTRATION *1 Occupant Classification ECU *2 Center Airbag Sensor Assembly *3 Front Seat Wire RH *4 No. 2 Floor Wire *5 Front view of wire harness connector (to Front Seat Wire RH) *6 Connector C NG --> REPLACE NO. 2 FLOOR WIRE OK --> REPLACE FRONT SEAT WIRE RH
14. CHECK NO. 2 FLOOR WIRE (SHORT TO GROUND) Disconnect the front seat wire RH connector from the No. 2 floor wire. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition SW1-1 (FSR+) - Body ground Always 1 Mohms or higher SW1-4 (FSR-) - Body ground Always 1 Mohms or higher TEXT IN ILLUSTRATION *1 Occupant Classification ECU *2 Center Airbag Sensor Assembly *3 Front Seat Wire RH *4 No. 2 Floor Wire *5 Front view of wire harness connector (to Front Seat Wire RH) *6 Connector C NG --> REPLACE NO. 2 FLOOR WIRE OK --> REPLACE FRONT SEAT WIRE RH
15. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv)
16. REPLACE CENTER AIRBAG SENSOR ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/airbag/#supplemental-restraint-system-service-information-except-phv)

The occupant classification sensor power supply circuit consists of the occupant classification ECU and occupant classification sensors.

DTC B1793 is stored when a malfunction is detected in the occupant classification sensor power supply circuit.

HINT

When DTC B1650/32 is detected as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant classification ECU. When DTC B1793 is output, perform troubleshooting for the DTC.

Scheme 56

HINT

1. If troubleshooting (wire harness inspection) is difficult to perform, remove the front passenger seat installation bolts to see under the seat cushion.
2. In the above case, hold the seat so that it does not fall down. Hold the seat only as necessary because holding the seat for a long period of time may cause seat rail deformation.

Scheme 57

Scheme 58

1. CHECK CONNECTORS Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. Check that the connectors are properly connected to the 4 occupant classification sensors and occupant classification ECU. OK The connectors are properly connected. HINT: If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection. Disconnect the connectors from the 4 occupant classification sensors and occupant classification ECU. Check that the terminals of connectors are not damaged. OK The terminals are not deformed or damaged. NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
2. CHECK FRONT SEAT WIRE RH (SHORT TO B+) Connect the cable to the negative (-) battery terminal. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition W2-5 (SVC3) - Body ground Power switch on (IG) Below 1 V W2-6 (SVC4) - Body ground Power switch on (IG) Below 1 V W2-11 (SVC1) - Body ground Power switch on (IG) Below 1 V W2-12 (SVC2) - Body ground Power switch on (IG) Below 1 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Occupant Classification ECU) NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
3. CHECK FRONT SEAT WIRE RH (SHORT TO GROUND) Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition W2-5 (SVC3) - Body ground Always 1 Mohms or higher W2-6 (SVC4) - Body ground Always 1 Mohms or higher W2-11 (SVC1) - Body ground Always 1 Mohms or higher W2-12 (SVC2) - Body ground Always 1 Mohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Occupant Classification ECU) NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
4. CHECK FRONT SEAT WIRE RH (OPEN) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition W2-5 (SVC3) - W1-1 (SVC3) Always Below 1 ohms W2-6 (SVC4) - W7-1 (SVC4) Always Below 1 ohms W2-11 (SVC1) - W4-1 (SVC1) Always Below 1 ohms W2-12 (SVC2) - W6-1 (SVC2) Always Below 1 ohms TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Occupant Classification Sensor) *2 Front LH *3 Front RH *4 Rear LH *5 Rear RH *6 Front view of wire harness connector (to Occupant Classification ECU) NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
5. CHECK FRONT SEAT WIRE RH (SHORT) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition W2-5 (SVC3) - W2-6 (SVC4) Always 1 Mohms or higher W2-5 (SVC3) - W2-11 (SVC1) Always 1 Mohms or higher W2-5 (SVC3) - W2-12 (SVC2) Always 1 Mohms or higher W2-6 (SVC4) - W2-11 (SVC1) Always 1 Mohms or higher W2-6 (SVC4) - W2-12 (SVC2) Always 1 Mohms or higher W2-11 (SVC1) - W2-12 (SVC2) Always 1 Mohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Occupant Classification ECU) NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
6. CHECK DTC Connect the connectors to the occupant classification ECU and 4 occupant classification sensors. Connect the cable to the negative (-) battery terminal. Turn the power switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__dtc-checkclear) . Clear the DTCs stored in the center airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/airbag/#airbag-system-diagnostics-introduction-except-phv) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__dtc-checkclear) . OK DTC B1793 is not output. HINT: Codes other than DTC B1793 may be output at this time, but they are not related to this check. NG --> See step 7 OK --> See step 10
7. REPLACE FRONT SEAT CUSHION SPRING ASSEMBLY Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. Replace the front seat cushion spring assembly. Refer to «DISASSEMBLY»(/toyota/prius-phv/pre-iii-2010-2011/remont/seats/#seat-service-information-except-phv) . NEXT: Go to next step
8. PERFORM ZERO POINT CALIBRATION Connect the cable to the negative (-) battery terminal. Connect the Techstream to the DLC3. Turn the power switch on (IG). Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . OK "Zero Point Calibration is complete." is displayed. NEXT: Go to next step
9. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . Standard 27 to 33 kg (59.5 to 72.8 lb) NEXT --> END
10. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv)

DTC B1794 is stored when a malfunction is detected in the occupant classification ECU battery positive line.

HINT

When DTC B1650/32 is detected as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant classification ECU. When DTC B1794 is output, perform troubleshooting for the DTC.

Scheme 59

Note. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Scheme 60

1. CHECK AUXILIARY BATTERY VOLTAGE Measure the voltage of the auxiliary battery. Standard Voltage 11 to 14 V NG --> See step 7 OK: Go to next step
2. CHECK WIRE HARNESS (SOURCE VOLTAGE) Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. Disconnect the connector from the occupant classification ECU. Connect the cable to the negative (-) battery terminal. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition W3-1 (+B) - Body ground Always 11 to 14 V Turn the power switch off. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition W3-3 (GND) - Body ground Always Below 1 ohms TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Occupant Classification ECU) NG --> REPLACE WIRE HARNESS OK: Go to next step
3. CHECK DTC Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. Connect the connector to the occupant classification ECU. Connect the Techstream to the DLC3. Connect the cable to the negative (-) battery terminal. Turn the power switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/airbag/#airbag-system-diagnostics-introduction-except-phv) . Clear the DTCs stored in the center airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__dtc-checkclear) . Turn the power switch off. Turn the power switch on (IG), and wait for at least 10 seconds. Using the Techstream, check for DTCs of the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__dtc-checkclear) . OK DTC B1794 is not output. HINT: Codes other than DTC B1794 may be output at this time, but they are not related to this check. NG --> See step 4 OK --> See step 8
4. REPLACE OCCUPANT CLASSIFICATION ECU Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. Replace the occupant classification ECU. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/airbag/#supplemental-restraint-system-service-information-except-phv) . NEXT: Go to next step
5. PERFORM ZERO POINT CALIBRATION Connect the cable to the negative (-) battery terminal. Connect the Techstream to the DLC3. Turn the power switch on (IG). Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . OK "Zero Point Calibration is complete." is displayed. NEXT: Go to next step
6. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . Standard 27 to 33 kg (59.5 to 72.8 lb) NEXT --> END
7. INSPECT AUXILIARY BATTERY. Refer to «ON-VEHICLE INSPECTION»(/toyota/prius-phv/pre-iii-2010-2011/remont/body-electrical/#battery-service-information-except-phv__on-vehicle-inspection)
8. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv)

DTC B1795 is stored when a malfunction is detected in the occupant classification ECU.

HINT

When DTC B1650/32 is detected as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant classification ECU. When DTC B1795 is output, perform troubleshooting for the DTC.

1. REPLACE OCCUPANT CLASSIFICATION ECU Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. Replace the occupant classification ECU. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/airbag/#supplemental-restraint-system-service-information-except-phv) . NEXT: Go to next step
2. PERFORM ZERO POINT CALIBRATION Connect the cable to the negative (-) battery terminal. Connect the Techstream to the DLC3. Turn the power switch on (IG). Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . OK "Zero Point Calibration is complete." is displayed. NEXT: Go to next step
3. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . Standard 27 to 33 kg (59.5 to 72.8 lb) NEXT --> END

In sleep mode, the occupant classification ECU reads the condition of each sensor while the power switch is off.

In this mode, if occupant classification ECU detects an internal malfunction, DTC B1796 is stored.

HINT

When DTC B1650/32 is detected as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant classification ECU. When DTC B1796 is output, perform troubleshooting for the DTC.

1. REPLACE OCCUPANT CLASSIFICATION ECU Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. Replace the occupant classification ECU. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/airbag/#supplemental-restraint-system-service-information-except-phv) . NEXT: Go to next step
2. PERFORM ZERO POINT CALIBRATION Connect the cable to the negative (-) battery terminal. Connect the Techstream to the DLC3. Turn the power switch on (IG). Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . OK "Zero Point Calibration is complete." is displayed. NEXT: Go to next step
3. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . Standard 27 to 33 kg (59.5 to 72.8 lb) NEXT --> END

The occupant classification system detects the front passenger seat condition. It then informs the front passenger airbag and front seat belt pretensioner RH condition (activated/not activated) with the passenger airbag ON/OFF indicator.

HINT

Approximately 6 seconds after the power switch is turned on (IG), the passenger airbag ON/OFF indicator will indicate ON/OFF depending on the conditions listed below.

1. CHECK SRS WARNING LIGHT Turn the power switch on (IG), and check the SRS warning light condition. HINT: If this trouble occurs, the SRS warning light is off. If the light is on, a DTC is output. Troubleshoot for the output DTC. OK After the primary check period, the SRS warning light goes off. HINT: The primary check is performed for approximately 6 seconds after the power switch is turned on (IG). NG --> See step 16 OK: Go to next step
2. PERFORM ZERO POINT CALIBRATION Turn the power switch off. Connect the Techstream to the DLC3. Turn the power switch on (IG). Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . OK "Zero Point Calibration is complete." is displayed. NG --> See step 4 OK: Go to next step
3. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . Standard 27 to 33 kg (59.5 to 72.8 lb) NG --> See step 4 OK --> END
4. RETIGHTEN FRONT SEAT ASSEMBLY RH BOLT Turn the power switch off. Loosen the 4 installation bolts of the front seat assembly RH. Tighten the 4 installation bolts of the front seat assembly RH to the specified torque. Torque: 37 N*m (374 kgf*cm, 27 ft.*lbf) NEXT: Go to next step
5. PERFORM ZERO POINT CALIBRATION Connect the Techstream to the DLC3. Turn the power switch on (IG). Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . OK "Zero Point Calibration is complete." is displayed. NG --> See step 7 OK: Go to next step
6. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . Standard 27 to 33 kg (59.5 to 72.8 lb) NG --> See step 7 OK --> END
7. READ VALUE USING PASSENGER SIDE BUCKLE SWITCH Turn the power switch on (IG). Using the Techstream, read Data List. Refer to «DATA LIST / ACTIVE TEST»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__data-listactive-test) . Read the display when the passenger side buckle switch is operated. OCCUPANT DETECTION Tester Display Measurement Item / Range Normal Condition Diagnostic Note Passenger Buckle SW Passenger side buckle switch/ Set: The seat belt is fastened Unset: The seat belt is not fastened NG: Data is not determined Unset/Set - OK The Techstream display changes correctly in accordance with the operation of the buckle switch. NG --> See step 12 OK: Go to next step
8. CHECK CONNECTORS Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. Disconnect the connectors from the occupant classification ECU and 4 occupant classification sensors. Check that the terminals of connectors are not damaged. OK The terminals are not deformed or damaged. NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
9. REPLACE OCCUPANT CLASSIFICATION ECU Connect the connectors to the 4 occupant classification sensors. Replace the occupant classification ECU. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/airbag/#supplemental-restraint-system-service-information-except-phv) . NEXT: Go to next step
10. PERFORM ZERO POINT CALIBRATION Connect the cable to the negative (-) battery terminal. Connect the Techstream to the DLC3. Turn the power switch on (IG). Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . OK "Zero Point Calibration is complete." is displayed. NEXT: Go to next step
11. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . Standard 27 to 33 kg (59.5 to 72.8 lb) NEXT --> END
12. CHECK CONNECTORS Turn the power switch off. Disconnect the cable from the negative (-) battery terminal. Disconnect the connectors from the occupant classification ECU and front seat inner belt assembly RH. Check that the terminals of connectors are not damaged. OK The terminals are not deformed or damaged. NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
13. REPLACE FRONT SEAT INNER BELT ASSEMBLY RH Connect the connector to the occupant classification ECU. Replace the front seat inner belt assembly RH. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#seat-belt-service-information-except-phv) . NEXT: Go to next step
14. PERFORM ZERO POINT CALIBRATION Connect the cable to the negative (-) battery terminal. Connect the Techstream to the DLC3. Turn the power switch on (IG). Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . OK "Zero Point Calibration is complete." is displayed. NEXT: Go to next step
15. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/restraints-control-systems/#occupant-classification-system-diagnostics-introduction-except-phv__initialization) . Standard 27 to 33 kg (59.5 to 72.8 lb) NEXT --> END
16. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-phv/pre-iii-2010-2011/remont/airbag/#airbag-system-diagnostics-introduction-except-phv__diagnostic-trouble-code-chart)

See also:
• DTC CHECK / CLEAR
• DTC CHECK / CLEAR
• REMOVAL
• REMOVAL
• INITIALIZATION
• HOW TO PROCEED WITH TROUBLESHOOTING
• DISASSEMBLY
• ON-VEHICLE INSPECTION
• DATA LIST / ACTIVE TEST
• DIAGNOSTIC TROUBLE CODE CHART