Occupant Classification System [diagnostic Codes & Symptom Tests] Toyota Prius V I

DESCRIPTION

The passenger side buckle switch circuit consists of the occupant detection 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 detection ECU. When DTC B1771 is output, perform troubleshooting for the DTC.

Scheme 279

INSPECTION PROCEDURE

Note. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work. Refer to PRECAUTION .

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, lift and 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 280

Scheme 281

1. CHECK CONNECTORS Turn the power switch off. Disconnect the cable from the negative (-) auxiliary battery terminal. Check that the connectors are properly connected to the occupant detection 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 detection ECU and front seat inner belt assembly RH. Check that the terminals of the 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 (-) auxiliary 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 Turn the power switch off. Disconnect the cable from the negative (-) auxiliary battery terminal. TEXT IN ILLUSTRATION *1 Front Seat Inner Belt Assembly RH *2 Occupant Detection ECU *3 Front Seat Wire RH *a Front view of wire harness connector (to Occupant Detection ECU) NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
3. CHECK FRONT SEAT WIRE RH (OPEN) Using a service wire, connect terminals 1 (BSW) and 2 (BGND) of connector C. NOTE: Do not forcibly insert the service wire into the terminals of the connector when connecting the wire. 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 Disconnect the service wire from connector C. TEXT IN ILLUSTRATION *1 Front Seat Inner Belt Assembly RH *2 Occupant Detection ECU *3 Front Seat Wire RH *4 Service Wire *a Front view of wire harness connector (to Occupant Detection ECU) *b Front view of wire harness connector (to Front Seat Inner Belt Assembly RH) NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
4. 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 W3-9 (BSW) - W3-5 (BGND) Always 1 Mohms or higher TEXT IN ILLUSTRATION *1 Front Seat Inner Belt Assembly RH *2 Occupant Detection ECU *3 Front Seat Wire RH *a Front view of wire harness connector (to Occupant Detection ECU) 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 Detection ECU *3 Front Seat Wire RH *a Front view of wire harness connector (to Occupant Detection ECU) NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
6. CHECK DTC Connect the connectors to the occupant detection ECU and front seat inner belt assembly RH. Connect the cable to the negative (-) auxiliary battery terminal. Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__dtc-check-clear) . Clear the DTCs stored in the airbag ECU assembly. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#supplemental-restraint-system-diagnostics-introduction) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__dtc-check-clear) . 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. Turn the power switch off. NG --> See step 7 OK --> See step 11
7. CHECK FRONT SEAT INNER BELT ASSEMBLY RH Disconnect the cable from the negative (-) auxiliary battery terminal. Replace the front seat inner belt assembly RH with a known good one. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#seat-belts-service-information__removal) . HINT: Perform the following inspection using known good parts from another vehicle if possible. Connect the cable to the negative (-) auxiliary battery terminal. Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__dtc-check-clear) . Clear the DTCs stored in the airbag ECU assembly. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#supplemental-restraint-system-diagnostics-introduction) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__dtc-check-clear) . 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. Turn the power switch off. Disconnect the cable from the negative (-) auxiliary battery terminal. Restore the front seat inner belt assembly RH that was installed for testing to its original location. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#seat-belts-service-information__removal) . NG --> See step 8 OK --> REPLACE FRONT SEAT INNER BELT ASSEMBLY RH
8. REPLACE OCCUPANT DETECTION ECU Disconnect the cable from the negative (-) auxiliary battery terminal. Replace the occupant detection ECU with a new one. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/airbag/#supplemental-restraint-system-service-information) . Connect the cable to the negative (-) auxiliary battery terminal. NEXT: Go to next step
9. PERFORM ZERO POINT CALIBRATION Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT: Go to next step
10. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT --> END
11. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction)

The front occupant classification sensor LH circuit consists of the occupant detection 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 detection ECU. When DTC B1780 is output, perform troubleshooting for the DTC.

Scheme 282

Note. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work. Refer to PRECAUTION .

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, lift and 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 283

Scheme 284

1. CHECK CONNECTORS Turn the power switch off. Disconnect the cable from the negative (-) auxiliary battery terminal. Check that the connectors are properly connected to the occupant detection 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 detection ECU and front occupant classification sensor LH. Check that the terminals of the 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 (-) auxiliary 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 Turn the power switch off. Disconnect the cable from the negative (-) auxiliary battery terminal. TEXT IN ILLUSTRATION *1 Front Occupant Classification Sensor LH *2 Occupant Detection ECU *3 Front Seat Wire RH *a Front view of wire harness connector (to Occupant Detection ECU) NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
3. CHECK FRONT SEAT WIRE RH (OPEN) Using a service wire, connect terminals 1 (SVC1) and 3 (SGD1), and connect terminals 2 (SIG1) and 3 (SGD1) of connector C. NOTE: Do not forcibly insert the service wire into the terminals of the connector when connecting the wire. 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 Disconnect the service wire from connector C. TEXT IN ILLUSTRATION *1 Front Occupant Classification Sensor LH *2 Occupant Detection ECU *3 Front Seat Wire RH *4 Service Wire *a Front view of wire harness connector (to Occupant Detection ECU) *b Front view of wire harness connector (to Front Occupant Classification Sensor LH) NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
4. 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 W2-7 (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 Detection ECU *3 Front Seat Wire RH *a Front view of wire harness connector (to Occupant Detection ECU) 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 Detection ECU *3 Front Seat Wire RH *a Front view of wire harness connector (to Occupant Detection ECU) NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
6. CHECK DTC Connect the connectors to the occupant detection ECU and front occupant classification sensor LH. Connect the cable to the negative (-) auxiliary battery terminal. Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__dtc-check-clear) . Clear the DTCs stored in the airbag ECU assembly. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#supplemental-restraint-system-diagnostics-introduction) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__dtc-check-clear) . 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. Turn the power switch off. NG --> See step 7 OK --> See step 10
7. REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY Disconnect the cable from the negative (-) auxiliary battery terminal. Replace the separate type front seat cushion spring assembly. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/seats/#seats-service-information) . Connect the cable to the negative (-) auxiliary battery terminal. NEXT: Go to next step
8. PERFORM ZERO POINT CALIBRATION Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT: Go to next step
9. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT --> END
10. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction)

The front occupant classification sensor RH circuit consists of the occupant detection 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 detection ECU. When DTC B1781 is output, perform troubleshooting for the DTC.

Scheme 285

Note. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work. Refer to PRECAUTION .

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, lift and 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 286

Scheme 287

1. CHECK CONNECTORS Turn the power switch off. Disconnect the cable from the negative (-) auxiliary battery terminal. Check that the connectors are properly connected to the occupant detection 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 detection ECU and front occupant classification sensor RH. Check that the terminals of the 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 (-) auxiliary 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 Turn the power switch off. Disconnect the cable from the negative (-) auxiliary battery terminal. TEXT IN ILLUSTRATION *1 Front Occupant Classification Sensor RH *2 Occupant Detection ECU *3 Front Seat Wire RH *a Front view of wire harness connector (to Occupant Detection ECU) NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
3. CHECK FRONT SEAT WIRE RH (OPEN) Using a service wire, connect terminals 1 (SVC2) and 3 (SGD2), and connect terminals 2 (SIG2) and 3 (SGD2) of connector C. NOTE: Do not forcibly insert the service wire into the terminals of the connector when connecting the wire. 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 Disconnect the service wire from connector C. TEXT IN ILLUSTRATION *1 Front Occupant Classification Sensor RH *2 Occupant Detection ECU *3 Front Seat Wire RH *4 Service Wire *a Front view of wire harness connector (to Occupant Detection ECU) *b Front view of wire harness connector (to Front Occupant Classification Sensor RH) NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
4. 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 W2-8 (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 Detection ECU *3 Front Seat Wire RH *a Front view of wire harness connector (to Occupant Detection ECU) 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 Detection ECU *3 Front Seat Wire RH *a Front view of wire harness connector (to Occupant Detection ECU) NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
6. CHECK DTC Connect the connectors to the occupant detection ECU and front occupant classification sensor RH. Connect the cable to the negative (-) auxiliary battery terminal. Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__dtc-check-clear) . Clear the DTCs stored in the airbag ECU assembly. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#supplemental-restraint-system-diagnostics-introduction) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__dtc-check-clear) . 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. Turn the power switch off. NG --> See step 7 OK --> See step 10
7. REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY Disconnect the cable from the negative (-) auxiliary battery terminal. Replace the separate type front seat cushion spring assembly. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/seats/#seats-service-information) . Connect the cable to the negative (-) auxiliary battery terminal. NEXT: Go to next step
8. PERFORM ZERO POINT CALIBRATION Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT: Go to next step
9. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT --> END
10. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction)

The rear occupant classification sensor LH circuit consists of the occupant detection 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 detection ECU. When DTC B1782 is output, perform troubleshooting for the DTC.

Scheme 288

Note. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work. Refer to PRECAUTION .

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, lift and 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 289

Scheme 290

1. CHECK CONNECTORS Turn the power switch off. Disconnect the cable from the negative (-) auxiliary battery terminal. Check that the connectors are properly connected to the occupant detection 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 detection ECU and rear occupant classification sensor LH. Check that the terminals of the 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 (-) auxiliary 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 Turn the power switch off. Disconnect the cable from the negative (-) auxiliary battery terminal. TEXT IN ILLUSTRATION *1 Rear Occupant Classification Sensor LH *2 Occupant Detection ECU *3 Front Seat Wire RH *a Front view of wire harness connector (to Occupant Detection ECU) NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
3. CHECK FRONT SEAT WIRE RH (OPEN) Using a service wire, connect terminals 5 (SVC3) and 3 (SGD3), and connect terminals 9 (SIG3) and 3 (SGD3) of connector C. NOTE: Do not forcibly insert the service wire into the terminals of the connector when connecting the wire. 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 Disconnect the service wire from connector C. TEXT IN ILLUSTRATION *1 Rear Occupant Classification Sensor LH *2 Occupant Detection ECU *3 Front Seat Wire RH *4 Service Wire *a Front view of wire harness connector (to Occupant Detection ECU) *b Front view of wire harness connector (to Rear Occupant Classification Sensor LH) NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
4. 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) - W2-3 (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 Detection ECU *3 Front Seat Wire RH *a Front view of wire harness connector (to Occupant Detection ECU) 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 Detection ECU *3 Front Seat Wire RH *a Front view of wire harness connector (to Occupant Detection ECU) NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
6. CHECK DTC Connect the connectors to the occupant detection ECU and rear occupant classification sensor LH. Connect the cable to the negative (-) auxiliary battery terminal. Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__dtc-check-clear) . Clear the DTCs stored in the airbag ECU assembly. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#supplemental-restraint-system-diagnostics-introduction) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__dtc-check-clear) . 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. Turn the power switch off. NG --> See step 7 OK --> See step 10
7. REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY Disconnect the cable from the negative (-) auxiliary battery terminal. Replace the separate type front seat cushion spring assembly. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/seats/#seats-service-information) . Connect the cable to the negative (-) auxiliary battery terminal. NEXT: Go to next step
8. PERFORM ZERO POINT CALIBRATION Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT: Go to next step
9. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT --> END
10. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction)

The rear occupant classification sensor RH circuit consists of the occupant detection 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 detection ECU. When DTC B1783 is output, perform troubleshooting for the DTC.

Scheme 291

Note. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work. Refer to PRECAUTION .

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, lift and 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 292

Scheme 293

1. CHECK CONNECTORS Turn the power switch off. Disconnect the cable from the negative (-) auxiliary battery terminal. Check that the connectors are properly connected to the occupant detection 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 detection ECU and rear occupant classification sensor RH. Check that the terminals of the 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 (-) auxiliary 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 Turn the power switch off. Disconnect the cable from the negative (-) auxiliary battery terminal. TEXT IN ILLUSTRATION *1 Rear Occupant Classification Sensor RH *2 Occupant Detection ECU *3 Front Seat Wire RH *a Front view of wire harness connector (to Occupant Detection ECU) NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
3. CHECK FRONT SEAT WIRE RH (OPEN) Using a service wire, connect terminals 6 (SVC4) and 4 (SGD4), and connect terminals 10 (SIG4) and 4 (SGD4) of connector C. NOTE: Do not forcibly insert the service wire into the terminals of the connector when connecting the wire. 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 Disconnect the service wire from connector C. TEXT IN ILLUSTRATION *1 Rear Occupant Classification Sensor RH *2 Occupant Detection ECU *3 Front Seat Wire RH *4 Service Wire *a Front view of wire harness connector (to Occupant Detection ECU) *b Front view of wire harness connector (to Rear Occupant Classification Sensor RH) NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
4. 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 W2-6 (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 Detection ECU *3 Front Seat Wire RH *a Front view of wire harness connector (to Occupant Detection ECU) 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 Detection ECU *3 Front Seat Wire RH *a Front view of wire harness connector (to Occupant Detection ECU) NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
6. CHECK DTC Connect the connectors to the occupant detection ECU and rear occupant classification sensor RH. Connect the cable to the negative (-) auxiliary battery terminal. Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__dtc-check-clear) . Clear the DTCs stored in the airbag ECU assembly. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#supplemental-restraint-system-diagnostics-introduction) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__dtc-check-clear) . 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. Turn the power switch off. NG --> See step 7 OK --> See step 10
7. REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY Disconnect the cable from the negative (-) auxiliary battery terminal. Replace the separate type front seat cushion spring assembly. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/seats/#seats-service-information) . Connect the cable to the negative (-) auxiliary battery terminal. NEXT: Go to next step
8. PERFORM ZERO POINT CALIBRATION Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT: Go to next step
9. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT --> END
10. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction)

DTC B1785 is stored when the occupant detection 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 was not in a collision, but the occupant detection ECU receives a collision detection signal and stores 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 detection ECU. When DTC B1785 is output, perform troubleshooting for the DTC.

WIRING DIAGRAM

Refer to DTC B1780. Refer to WIRING DIAGRAM .

Note. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work. Refer to PRECAUTION .

PROCEDURE

1. PERFORM ZERO POINT CALIBRATION Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . OK "Zero Point Calibration is complete." is displayed. NG --> See step 4 OK: Go to next step
2. CHECK DTC Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__dtc-check-clear) . Clear the DTCs stored in the airbag ECU assembly. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#supplemental-restraint-system-diagnostics-introduction) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__dtc-check-clear) . 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. Turn the power switch off. NG --> See step 4 OK: Go to next step
3. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT --> END
4. REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY Disconnect the cable from the negative (-) auxiliary battery terminal. Replace the separate type front seat cushion spring assembly. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/seats/#seats-service-information) . Connect the cable to the negative (-) auxiliary battery terminal. NEXT: Go to next step
5. PERFORM ZERO POINT CALIBRATION Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT: Go to next step
6. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT --> END

DTC B1786 is stored when the occupant detection 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 was not in a collision, but the occupant detection ECU receives a collision detection signal and stores 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 detection ECU. When DTC B1786 is output, perform troubleshooting for the DTC.

Refer to DTC B1781. Refer to WIRING DIAGRAM .

Note. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work. Refer to PRECAUTION .

1. PERFORM ZERO POINT CALIBRATION Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . OK "Zero Point Calibration is complete." is displayed. NG --> See step 4 OK: Go to next step
2. CHECK DTC Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__dtc-check-clear) . Clear the DTCs stored in the airbag ECU assembly. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#supplemental-restraint-system-diagnostics-introduction) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__dtc-check-clear) . 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. Turn the power switch off. NG --> See step 4 OK: Go to next step
3. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT --> END
4. REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY Disconnect the cable from the negative (-) auxiliary battery terminal. Replace the separate type front seat cushion spring assembly. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/seats/#seats-service-information) . Connect the cable to the negative (-) auxiliary battery terminal. NEXT: Go to next step
5. PERFORM ZERO POINT CALIBRATION Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT: Go to next step
6. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT --> END

DTC B1787 is stored when the occupant detection 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 was not in a collision, but the occupant detection ECU receives a collision detection signal and stores 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 detection ECU. When DTC B1787 is output, perform troubleshooting for the DTC.

Refer to DTC B1782. Refer to WIRING DIAGRAM .

Note. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work. Refer to PRECAUTION .

1. PERFORM ZERO POINT CALIBRATION Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . OK "Zero Point Calibration is complete." is displayed. NG --> See step 4 OK: Go to next step
2. CHECK DTC Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__dtc-check-clear) . Clear the DTCs stored in the airbag ECU assembly. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#supplemental-restraint-system-diagnostics-introduction) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__dtc-check-clear) . 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. Turn the power switch off. NG --> See step 4 OK: Go to next step
3. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT --> END
4. REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY Disconnect the cable from the negative (-) auxiliary battery terminal. Replace the separate type front seat cushion spring assembly. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/seats/#seats-service-information) . Connect the cable to the negative (-) auxiliary battery terminal. NEXT: Go to next step
5. PERFORM ZERO POINT CALIBRATION Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT: Go to next step
6. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT --> END

DTC B1788 is stored when the occupant detection 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 was not in a collision, but the occupant detection ECU receives a collision detection signal and stores 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 detection ECU. When DTC B1788 is output, perform troubleshooting for the DTC.

Refer to DTC B1783. Refer to WIRING DIAGRAM .

Note. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work. Refer to PRECAUTION .

1. PERFORM ZERO POINT CALIBRATION Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . OK "Zero Point Calibration is complete." is displayed. NG --> See step 4 OK: Go to next step
2. CHECK DTC Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__dtc-check-clear) . Clear the DTCs stored in the airbag ECU assembly. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#supplemental-restraint-system-diagnostics-introduction) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__dtc-check-clear) . 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. Turn the power switch off. NG --> See step 4 OK: Go to next step
3. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT --> END
4. REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY Disconnect the cable from the negative (-) auxiliary battery terminal. Replace the separate type front seat cushion spring assembly. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/seats/#seats-service-information) . Connect the cable to the negative (-) auxiliary battery terminal. NEXT: Go to next step
5. PERFORM ZERO POINT CALIBRATION Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT: Go to next step
6. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT --> END

The airbag ECU assembly communication circuit consists of the occupant detection ECU and airbag ECU assembly.

DTC B1790 is stored when a malfunction is detected in the airbag ECU 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 detection ECU. When DTC B1790 is output, perform troubleshooting for the DTC.

Scheme 294

Note. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work. Refer to PRECAUTION .

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, lift and 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 295

Scheme 296

Scheme 297

Scheme 298

1. CHECK CONNECTORS Turn the power switch off. Disconnect the cable from the negative (-) auxiliary battery terminal. WARNING: Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system. Check that the connectors are properly connected to the airbag ECU assembly and occupant detection 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 airbag ECU assembly and occupant detection ECU. Also disconnect the connectors that link the front seat wire RH and No. 2 floor wire. Check that the terminals of the 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 (-) auxiliary 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 Turn the power switch off. Disconnect the cable from the negative (-) auxiliary battery terminal. WARNING: Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system. TEXT IN ILLUSTRATION *1 Occupant Detection ECU *2 Airbag ECU Assembly *a Front view of wire harness connector (to Occupant Detection ECU) NG --> See step 11 OK: Go to next step
3. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (OPEN) Using a service wire, connect terminals 12 (FSR+) and 13 (FSR-) of connector B. NOTE: Do not forcibly insert the service wire into the terminals of the connector when connecting the wire. 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 Detection ECU *2 Airbag ECU Assembly *3 Service Wire *a Front view of wire harness connector (to Airbag ECU Assembly) *b Front view of wire harness connector (to Occupant Detection ECU) NG --> See step 12 OK: Go to next step
4. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (SHORT) Disconnect the service wire 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 Detection ECU *2 Airbag ECU Assembly *a Front view of wire harness connector (to Occupant Detection ECU) 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 Detection ECU *2 Airbag ECU Assembly *a Front view of wire harness connector (to Occupant Detection ECU) NG --> See step 14 OK: Go to next step
6. CHECK DTC Connect the connectors to the occupant detection ECU and airbag ECU assembly. Connect the cable to the negative (-) auxiliary battery terminal. Turn the power switch on (IG). Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__dtc-check-clear) . Clear the DTCs stored in the airbag ECU assembly. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#supplemental-restraint-system-diagnostics-introduction) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__dtc-check-clear) . 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. Turn the power switch off. NG --> See step 7 OK --> See step 15
7. CHECK OCCUPANT DETECTION ECU Disconnect the cable from the negative (-) auxiliary battery terminal. Replace the occupant detection ECU with a known good one. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/airbag/#supplemental-restraint-system-service-information) . HINT: Perform the following inspection using known good parts from another vehicle if possible. Connect the cable to the negative (-) auxiliary battery terminal. Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__dtc-check-clear) . Clear the DTCs stored in the airbag ECU assembly. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#supplemental-restraint-system-diagnostics-introduction) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__dtc-check-clear) . 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. Turn the power switch off. Disconnect the cable from the negative (-) auxiliary battery terminal. Restore the occupant detection ECU that was installed for testing to its original location. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/airbag/#supplemental-restraint-system-service-information) . NG --> See step 16 OK: Go to next step
8. REPLACE OCCUPANT DETECTION ECU Disconnect the cable from the negative (-) auxiliary battery terminal. Replace the occupant detection ECU with a new one. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/airbag/#supplemental-restraint-system-service-information) . Connect the cable to the negative (-) auxiliary battery terminal. NEXT: Go to next step
9. PERFORM ZERO POINT CALIBRATION Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT: Go to next step
10. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT --> END
11. CHECK NO. 2 FLOOR WIRE (SHORT TO B+) Disconnect the front seat wire RH connector from the No. 2 floor wire. Connect the cable to the negative (-) auxiliary 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 Detection ECU *2 Airbag ECU Assembly *3 Front Seat Wire RH *4 No. 2 Floor Wire *a Front view of wire harness connector (to Front Seat Wire RH) 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: The service wire 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 Disconnect the service wire from connector B. TEXT IN ILLUSTRATION *1 Occupant Detection ECU *2 Airbag ECU Assembly *3 Front Seat Wire RH *4 No. 2 Floor Wire *5 Service Wire *a Front view of wire harness connector (to Airbag ECU Assembly) *b Front view of wire harness connector (to Front Seat Wire RH) 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 Detection ECU *2 Airbag ECU Assembly *3 Front Seat Wire RH *4 No. 2 Floor Wire *a Front view of wire harness connector (to Front Seat Wire RH) 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 Detection ECU *2 Airbag ECU Assembly *3 Front Seat Wire RH *4 No. 2 Floor Wire *a Front view of wire harness connector (to Front Seat Wire RH) 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-v/i-2011-2014/remont/hoistjack/#introduction)
16. REPLACE AIRBAG ECU ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/airbag/#supplemental-restraint-system-service-information)

The occupant classification sensor power supply circuit consists of the occupant detection 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 detection ECU. When DTC B1793 is output, perform troubleshooting for the DTC.

Scheme 299

Note. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work. Refer to PRECAUTION .

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, lift and 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 300

Scheme 301

1. CHECK CONNECTORS Turn the power switch off. Disconnect the cable from the negative (-) auxiliary battery terminal. Check that the connectors are properly connected to the 4 occupant classification sensors and occupant detection 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 detection ECU. Check that the terminals of the 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 (-) auxiliary 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 Turn the power switch off. Disconnect the cable from the negative (-) auxiliary battery terminal. TEXT IN ILLUSTRATION *1 4 Occupant Classification Sensors *2 Occupant Detection ECU *3 Front Seat Wire RH *a Front view of wire harness connector (to Occupant Detection ECU) NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
3. 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 W2-5 (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 4 Occupant Classification Sensors *2 Occupant Detection ECU *3 Front Seat Wire RH *a Front view of wire harness connector (to Occupant Detection 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 4 Occupant Classification Sensors *2 Occupant Detection ECU *3 Front Seat Wire RH *a Front view of wire harness connector (to Occupant Detection ECU) *b Front view of wire harness connector (to 4 Occupant Classification Sensors) *c to Front Occupant Classification Sensor LH *d to Rear Occupant Classification Sensor RH *e to Front Occupant Classification Sensor RH *f to Rear Occupant Classification Sensor LH 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 4 Occupant Classification Sensors *2 Occupant Detection ECU *3 Front Seat Wire RH *a Front view of wire harness connector (to Occupant Detection ECU) NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
6. CHECK DTC Connect the connectors to the occupant detection ECU and 4 occupant classification sensors. Connect the cable to the negative (-) auxiliary battery terminal. Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__dtc-check-clear) . Clear the DTCs stored in the airbag ECU assembly. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#supplemental-restraint-system-diagnostics-introduction) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__dtc-check-clear) . 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. Turn the power switch off. NG --> See step 7 OK --> See step 10
7. REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY Disconnect the cable from the negative (-) auxiliary battery terminal. Replace the separate type front seat cushion spring assembly. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/seats/#seats-service-information) . Connect the cable to the negative (-) auxiliary battery terminal. NEXT: Go to next step
8. PERFORM ZERO POINT CALIBRATION Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT: Go to next step
9. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT --> END
10. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction)

DTC B1794 is stored when a malfunction is detected in the occupant detection ECU auxiliary 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 detection ECU. When DTC B1794 is output, perform troubleshooting for the DTC.

Scheme 302

Note. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work. Refer to PRECAUTION . Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Scheme 303

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 (-) auxiliary battery terminal. Disconnect the connector from the occupant detection ECU. Connect the cable to the negative (-) auxiliary 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 Power switch off 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 *a Front view of wire harness connector (to Occupant Detection ECU) NG --> REPLACE WIRE HARNESS OK: Go to next step
3. CHECK DTC Disconnect the cable from the negative (-) auxiliary battery terminal. Connect the connector to the occupant detection ECU. Connect the cable to the negative (-) auxiliary battery terminal. Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__dtc-check-clear) . Clear the DTCs stored in the airbag ECU assembly. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#supplemental-restraint-system-diagnostics-introduction) . Turn the power switch off. Turn the power switch on (IG), and wait for at least 10 seconds. Check for DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__dtc-check-clear) . 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. Turn the power switch off. NG --> See step 4 OK --> See step 8
4. REPLACE OCCUPANT DETECTION ECU Disconnect the cable from the negative (-) auxiliary battery terminal. Replace the occupant detection ECU. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/airbag/#supplemental-restraint-system-service-information) . Connect the cable to the negative (-) auxiliary battery terminal. NEXT: Go to next step
5. PERFORM ZERO POINT CALIBRATION Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT: Go to next step
6. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT --> END
7. INSPECT CHARGING SYSTEM AND AUXILIARY BATTERY. Refer to «ON-VEHICLE INSPECTION»(/toyota/prius-v/i-2011-2014/remont/charging-system/#charging-system-inspection)
8. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction)

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

HINT

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

Note. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work. Refer to PRECAUTION .

1. REPLACE OCCUPANT DETECTION ECU Turn the power switch off. Disconnect the cable from the negative (-) auxiliary battery terminal. Replace the occupant detection ECU. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/airbag/#supplemental-restraint-system-service-information) . Connect the cable to the negative (-) auxiliary battery terminal. NEXT: Go to next step
2. PERFORM ZERO POINT CALIBRATION Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT: Go to next step
3. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT --> END

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

In this mode, if the occupant detection 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 detection ECU. When DTC B1796 is output, perform troubleshooting for the DTC.

Note. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work. Refer to PRECAUTION .

1. REPLACE OCCUPANT DETECTION ECU Turn the power switch off. Disconnect the cable from the negative (-) auxiliary battery terminal. Replace the occupant detection ECU. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/airbag/#supplemental-restraint-system-service-information) . Connect the cable to the negative (-) auxiliary battery terminal. NEXT: Go to next step
2. PERFORM ZERO POINT CALIBRATION Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT: Go to next step
3. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT --> END

The occupant classification system detects the front passenger seat condition. It then displays the front passenger airbag, front passenger side knee airbag and front seat belt pretensioner RH condition (activated/not activated) using 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.

Note. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work. Refer to PRECAUTION .

1. CHECK SRS WARNING LIGHT Turn the power switch on (IG), and check the SRS warning light condition. HINT: If passenger airbag ON/OFF indicator trouble occurs, the SRS warning light dose not illuminate. If the light comes on, a DTC is stored. Troubleshoot for the 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 Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__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-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__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 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. Refer to «INSTALLATION»(/toyota/prius-v/i-2011-2014/remont/seats/#seats-service-information) . NEXT: Go to next step
5. PERFORM ZERO POINT CALIBRATION Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__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-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . Standard 27 to 33 kg (59.5 to 72.8 lb) NG --> See step 7 OK --> END
7. READ VALUE USING TECHSTREAM Using the Techstream, read Data List. Refer to «DATA LIST / ACTIVE TEST»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__data-list-active-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 Set/Unset - 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 (-) auxiliary battery terminal. Disconnect the connectors from the occupant detection ECU and 4 occupant classification sensors. Check that the terminals of the 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 DETECTION ECU Connect the connectors to the 4 occupant classification sensors. Replace the occupant detection ECU. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/airbag/#supplemental-restraint-system-service-information) . Connect the cable to the negative (-) auxiliary battery terminal. NEXT: Go to next step
10. PERFORM ZERO POINT CALIBRATION Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT: Go to next step
11. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT --> END
12. CHECK CONNECTORS Turn the power switch off. Disconnect the cable from the negative (-) auxiliary battery terminal. Disconnect the connectors from the occupant detection ECU and front seat inner belt assembly RH. Check that the terminals of the 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 detection ECU. Replace the front seat inner belt assembly RH. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#seat-belts-service-information__removal) . Connect the cable to the negative (-) auxiliary battery terminal. NEXT: Go to next step
14. PERFORM ZERO POINT CALIBRATION Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT: Go to next step
15. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__initialization) . NEXT --> END
16. GO TO AIRBAG SYSTEM. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__diagnostic-trouble-code-chart)

See also:
• PRECAUTION
• DTC CHECK / CLEAR
• DTC CHECK / CLEAR
• REMOVAL
• REMOVAL
• INITIALIZATION
• REMOVAL
• ON-VEHICLE INSPECTION
• DATA LIST / ACTIVE TEST
• DIAGNOSTIC TROUBLE CODE CHART
• WIRING DIAGRAM