Home ReviewsRefund Car not listed?
Home/Toyota/Venza/Toyota Venza I (2008-2012)/Repair manual/Restraints Control Systems/Occupant Classification System (Diagnostic Codes & Symptom …
Contents Wiring diagrams Section: Restraints Control Systems All sections

Occupant Classification System (Diagnostic Codes & Symptom Tests): Diagnosis Toyota Venza I

Restraints Control Systems 21 illustrations ~10133 words

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 67

Scheme 67: PROCEDURE
Scheme 67: PROCEDURE

Scheme 68

Scheme 68
Scheme 68
  1. CHECK CONNECTORS Turn the ignition 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. RESULT Result Proceed to OK A NG (for Power seat) B NG (for Manual seat) C C --> REPLACE NO. 2 FLOOR WIRE B --> REPLACE FRONT SEAT WIRE RH A: Go to next step
  2. CHECK FRONT SEAT WIRE RH (SHORT TO B+) Connect the cable to the negative (-) battery terminal. Turn the ignition switch to ON. Measure the voltage according to the value(s) in the table below. Standard Voltage for Power Seat for Manual Seat Tester Connection Switch Condition Specified Condition S12-9 (BSW) - Body ground Ignition switch ON Below 1 V S12-5 (BGND) - Body ground Ignition switch ON Below 1 V Tester Connection Switch Condition Specified Condition M14-9 (BSW) - Body ground Ignition switch ON Below 1 V M14-5 (BGND) - Body ground Ignition switch ON Below 1 V RESULT Result Proceed to OK A NG (for Power seat) B NG (for Manual seat) C 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 *6 for Power Seat *7 for Manual Seat C --> REPLACE NO. 2 FLOOR WIRE B --> REPLACE FRONT SEAT WIRE RH A: Go to next step
  3. CHECK FRONT SEAT WIRE RH (OPEN) Turn the ignition switch off. Disconnect the cable from the negative (-) battery terminal. Using SST, connect terminals 2 and 1 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 for Power Seat for Manual Seat Tester Connection Condition Specified Condition S12-9 (BSW) - S12-5 (BGND) Always Below 1 ohms Tester Connection Condition Specified Condition M14-9 (BSW) - M14-5 (BGND) Always Below 1 ohms RESULT Result Proceed to OK A NG (for Power seat) B NG (for Manual seat) C 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 *8 for Power Seat *9 for Manual Seat - - C --> REPLACE NO. 2 FLOOR WIRE B --> REPLACE FRONT SEAT WIRE RH A: 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 for Power Seat for Manual Seat Tester Connection Condition Specified Condition S12-9 (BSW) - S12-5 (BGND) Always 1 Mohms or higher Tester Connection Condition Specified Condition M14-9 (BSW) - M14-5 (BGND) Always 1 Mohms or higher RESULT Result Proceed to OK A NG (for Power seat) B NG (for Manual seat) C 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 *6 for Power Seat *7 for Manual Seat C --> REPLACE NO. 2 FLOOR WIRE B --> REPLACE FRONT SEAT WIRE RH A: 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 for Power Seat for Manual Seat Tester Connection Condition Specified Condition S12-9 (BSW) - Body ground Always 1 Mohms or higher S12-5 (BGND) - Body ground Always 1 Mohms or higher Tester Connection Condition Specified Condition M14-9 (BSW) - Body ground Always 1 Mohms or higher M14-5 (BGND) - Body ground Always 1 Mohms or higher RESULT Result Proceed to OK A NG (for Power seat) B NG (for Manual seat) C 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 *6 for Power Seat *7 for Manual Seat C --> REPLACE NO. 2 FLOOR WIRE B --> REPLACE FRONT SEAT WIRE RH A: 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 ignition switch to ON. Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . Clear the DTCs stored in the center airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(ref-394836-S16636379082011040800000) . Turn the ignition switch off. Turn the ignition switch to ON. Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . 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 ignition switch off. Disconnect the cable from the negative (-) battery terminal. Replace the front seat inner belt assembly RH. Refer to «REMOVAL»(ref-394613-S18955130902011040800000) . HINT: Perform the inspection using parts from a normal vehicle if possible. Connect the cable to the negative (-) battery terminal. Turn the ignition switch to ON. Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . Clear the DTCs stored in the center airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(ref-394836-S16636379082011040800000) . Turn the ignition switch off. Turn the ignition switch to ON. Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . 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 ignition switch off. Disconnect the cable from the negative (-) battery terminal. Replace the occupant classification ECU. Refer to «REMOVAL»(ref-394612-S06806897562011040800000) . 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 ignition switch to ON. Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(ref-394630-S42267469492011040800000) . 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»(ref-394630-S42267469492011040800000) . 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»(ref-394610-S07332439272011040800000)

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 69

Scheme 69: PROCEDURE
Scheme 69: PROCEDURE

Scheme 70

Scheme 70
Scheme 70
  1. CHECK CONNECTORS Turn the ignition 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 ignition switch to ON. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition S13-1 (SGD1) - Body ground Ignition switch ON Below 1 V S13-7 (SIG1) - Body ground Ignition switch ON Below 1 V S13-11 (SVC1) - Body ground Ignition switch ON 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 ignition 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 S13-7 (SIG1) - S13-1 (SGD1) Always Below 1 ohms S13-11 (SVC1) - S13-1 (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 S13-7 (SIG1) - S13-1 (SGD1) Always 1 Mohms or higher S13-11 (SVC1) - S13-1 (SGD1) Always 1 Mohms or higher S13-7 (SIG1) - S13-11 (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 S13-1 (SGD1) - Body ground Always 1 Mohms or higher S13-7 (SIG1) - Body ground Always 1 Mohms or higher S13-11 (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 ignition switch to ON. Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . Clear the DTCs stored in the center airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(ref-394836-S16636379082011040800000) . Turn the ignition switch off. Turn the ignition switch to ON. Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . 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 14
  7. REPLACE OCCUPANT CLASSIFICATION ECU Turn the ignition switch off. Disconnect the cable from the negative (-) battery terminal. Replace the occupant classification ECU. Refer to «REMOVAL»(ref-394612-S06806897562011040800000) . HINT: Perform the inspection using parts from a normal vehicle if possible. 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 ignition switch to ON. Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(ref-394630-S42267469492011040800000) . OK "Zero Point Calibration is complete." is displayed. NG --> See step 11 OK: Go to next step
  9. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(ref-394630-S42267469492011040800000) . Standard 27 to 33 kg (59.5 to 72.8 lb) NG --> See step 11 OK: Go to next step
  10. CHECK DTC Turn the ignition switch to ON. Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . Clear the DTCs stored in the center airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(ref-394836-S16636379082011040800000) . Turn the ignition switch off. Turn the ignition switch to ON. Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . 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 11 OK --> END
  11. REPLACE FRONT SEAT ASSEMBLY RH Turn the ignition switch off. Disconnect the cable from the negative (-) battery terminal. Replace the front seat assembly RH. Refer to «REMOVAL»(ref-394821-S04430307052011040800000) for power seat or. Refer to «REMOVAL»(ref-394821-S07581256872011040800000) for manual seat). NEXT: Go to next step
  12. PERFORM ZERO POINT CALIBRATION Connect the cable to the negative (-) battery terminal. Connect the Techstream to the DLC3. Turn the ignition switch to ON. Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(ref-394630-S42267469492011040800000) . OK "Zero Point Calibration is complete." is displayed. NEXT: Go to next step
  13. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(ref-394630-S42267469492011040800000) . Standard 27 to 33 kg (59.5 to 72.8 lb) NEXT --> END
  14. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-394610-S07332439272011040800000)

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 71

Scheme 71: PROCEDURE
Scheme 71: PROCEDURE

Scheme 72

Scheme 72
Scheme 72
  1. CHECK CONNECTORS Turn the ignition 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 ignition switch to ON. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition S13-2 (SGD2) - Body ground Ignition switch ON Below 1 V S13-8 (SIG2) - Body ground Ignition switch ON Below 1 V S13-12 (SVC2) - Body ground Ignition switch ON 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 ignition 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 S13-8 (SIG2) - S13-2 (SGD2) Always Below 1 ohms S13-12 (SVC2) - S13-2 (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 S13-8 (SIG2) - S13-2 (SGD2) Always 1 Mohms or higher S13-12 (SVC2) - S13-2 (SGD2) Always 1 Mohms or higher S13-8 (SIG2) - S13-12 (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 S13-2 (SGD2) - Body ground Always 1 Mohms or higher S13-8 (SIG2) - Body ground Always 1 Mohms or higher S13-12 (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 the front occupant classification sensor RH. Connect the cable to the negative (-) battery terminal. Turn the ignition switch to ON. Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . Clear the DTCs stored in the center airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(ref-394836-S16636379082011040800000) . Turn the ignition switch off. Turn the ignition switch to ON. Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . 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 14
  7. REPLACE OCCUPANT CLASSIFICATION ECU Turn the ignition switch off. Disconnect the cable from the negative (-) battery terminal. Replace the occupant classification ECU. Refer to «REMOVAL»(ref-394612-S06806897562011040800000) . HINT: Perform the inspection using parts from a normal vehicle if possible. 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 ignition switch to ON. Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(ref-394630-S42267469492011040800000) . OK "Zero Point Calibration is complete." is displayed. NG --> See step 11 OK: Go to next step
  9. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(ref-394630-S42267469492011040800000) . Standard 27 to 33 kg (59.5 to 72.8 lb) NG --> See step 11 OK: Go to next step
  10. CHECK DTC Turn the ignition switch to ON. Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . Clear the DTCs stored in the center airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(ref-394836-S16636379082011040800000) . Turn the ignition switch off. Turn the ignition switch to ON. Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . 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 11 OK --> END
  11. REPLACE FRONT SEAT ASSEMBLY RH Turn the ignition switch off. Disconnect the cable from the negative (-) battery terminal. Replace the front seat assembly RH. Refer to «REMOVAL»(ref-394821-S04430307052011040800000) for power seat or. Refer to «REMOVAL»(ref-394821-S07581256872011040800000) for manual seat). NEXT: Go to next step
  12. PERFORM ZERO POINT CALIBRATION Connect the cable to the negative (-) battery terminal. Connect the Techstream to the DLC3. Turn the ignition switch to ON. Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(ref-394630-S42267469492011040800000) . OK "Zero Point Calibration is complete." is displayed. NEXT: Go to next step
  13. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(ref-394630-S42267469492011040800000) . Standard 27 to 33 kg (59.5 to 72.8 lb) NEXT --> END
  14. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-394610-S07332439272011040800000)

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 73

Scheme 73: PROCEDURE
Scheme 73: PROCEDURE

Scheme 74

Scheme 74
Scheme 74
  1. CHECK CONNECTORS Turn the ignition 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 ignition switch to ON. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition S13-3 (SGD3) - Body ground Ignition switch ON Below 1 V S13-5 (SVC3) - Body ground Ignition switch ON Below 1 V S13-9 (SIG3) - Body ground Ignition switch ON 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 ignition 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 S13-5 (SVC3) - S13-3 (SGD3) Always Below 1 ohms S13-9 (SIG3) - S13-3 (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 S13-5 (SVC3) - S13-3 (SGD3) Always 1 Mohms or higher S13-9 (SIG3) - S13-3 (SGD3) Always 1 Mohms or higher S13-5 (SVC3) - S13-9 (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 S13-3 (SGD3) - Body ground Always 1 Mohms or higher S13-5 (SVC3) - Body ground Always 1 Mohms or higher S13-9 (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 ignition switch to ON. Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . Clear the DTCs stored in the center airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(ref-394836-S16636379082011040800000) . Turn the ignition switch off. Turn the ignition switch to ON. Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . 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 14
  7. REPLACE OCCUPANT CLASSIFICATION ECU Turn the ignition switch off. Disconnect the cable from the negative (-) battery terminal. Replace the occupant classification ECU. Refer to «REMOVAL»(ref-394612-S06806897562011040800000) . HINT: Perform the inspection using parts from a normal vehicle if possible. 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 ignition switch to ON. Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(ref-394630-S42267469492011040800000) . OK "Zero Point Calibration is complete." is displayed. NG --> See step 11 OK: Go to next step
  9. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(ref-394630-S42267469492011040800000) . Standard 27 to 33 kg (59.5 to 72.8 lb) NG --> See step 11 OK: Go to next step
  10. CHECK DTC Turn the ignition switch to ON. Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . Clear the DTCs stored in the center airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(ref-394836-S16636379082011040800000) . Turn the ignition switch off. Turn the ignition switch to ON. Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . 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 11 OK --> END
  11. REPLACE FRONT SEAT ASSEMBLY RH Turn the ignition switch off. Disconnect the cable from the negative (-) battery terminal. Replace the front seat assembly RH. Refer to «REMOVAL»(ref-394821-S04430307052011040800000) for power seat or. Refer to «REMOVAL»(ref-394821-S07581256872011040800000) for manual seat). NEXT: Go to next step
  12. PERFORM ZERO POINT CALIBRATION Connect the cable to the negative (-) battery terminal. Connect the Techstream to the DLC3. Turn the ignition switch to ON. Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(ref-394630-S42267469492011040800000) . OK "Zero Point Calibration is complete." is displayed. NEXT: Go to next step
  13. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(ref-394630-S42267469492011040800000) . Standard 27 to 33 kg (59.5 to 72.8 lb) NEXT --> END
  14. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-394610-S07332439272011040800000)

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 75

Scheme 75: PROCEDURE
Scheme 75: PROCEDURE

Scheme 76

Scheme 76
Scheme 76
  1. CHECK CONNECTORS Turn the ignition switch off. Disconnect the cable from the negative (-) battery terminal. Check that the connectors are properly connected to occupant classification ECU and the 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 ignition switch to ON. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition S13-4 (SGD4) - Body ground Ignition switch ON Below 1 V S13-6 (SVC4) - Body ground Ignition switch ON Below 1 V S13-10 (SIG4) - Body ground Ignition switch ON 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 ignition 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 S13-6 (SVC4) - S13-4 (SGD4) Always Below 1 ohms S13-10 (SIG4) - S13-4 (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 S13-6 (SVC4) - S13-4 (SGD4) Always 1 Mohms or higher S13-10 (SIG4) - S13-4 (SGD4) Always 1 Mohms or higher S13-6 (SVC4) - S13-10 (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 S13-4 (SGD4) - Body ground Always 1 Mohms or higher S13-6 (SVC4) - Body ground Always 1 Mohms or higher S13-10 (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 ignition switch to ON. Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . Clear the DTCs stored in the center airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(ref-394836-S16636379082011040800000) . Turn the ignition switch off. Turn the ignition switch to ON. Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . 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 14
  7. REPLACE OCCUPANT CLASSIFICATION ECU Turn the ignition switch off. Disconnect the cable from the negative (-) battery terminal. Replace the occupant classification ECU. Refer to «REMOVAL»(ref-394612-S06806897562011040800000) . HINT: Perform the inspection using parts from a normal vehicle if possible. 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 ignition switch to ON. Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(ref-394630-S42267469492011040800000) . OK "Zero Point Calibration is complete." is displayed. NG --> See step 11 OK: Go to next step
  9. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(ref-394630-S42267469492011040800000) . Standard 27 to 33 kg (59.5 to 72.8 lb) NG --> See step 11 OK: Go to next step
  10. CHECK DTC Turn the ignition switch to ON. Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . Clear the DTCs stored in the center airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(ref-394836-S16636379082011040800000) . Turn the ignition switch off. Turn the ignition switch to ON. Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . 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 11 OK --> END
  11. REPLACE FRONT SEAT ASSEMBLY RH Turn the ignition switch off. Disconnect the cable from the negative (-) battery terminal. Replace the front seat assembly RH. Refer to «REMOVAL»(ref-394821-S04430307052011040800000) for power seat or. Refer to «REMOVAL»(ref-394821-S07581256872011040800000) for manual seat). NEXT: Go to next step
  12. PERFORM ZERO POINT CALIBRATION Connect the cable to the negative (-) battery terminal. Connect the Techstream to the DLC3. Turn the ignition switch to ON. Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(ref-394630-S42267469492011040800000) . OK "Zero Point Calibration is complete." is displayed. NEXT: Go to next step
  13. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(ref-394630-S42267469492011040800000) . Standard 27 to 33 kg (59.5 to 72.8 lb) NEXT --> END
  14. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-394610-S07332439272011040800000)

HINT

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

Scheme 77

Scheme 77: PROCEDURE
Scheme 77: PROCEDURE

Scheme 78

Scheme 78
Scheme 78

Scheme 79

Scheme 79
Scheme 79

Scheme 80

Scheme 80
Scheme 80

Scheme 81

Scheme 81
Scheme 81

Scheme 82

Scheme 82
Scheme 82

Scheme 83

Scheme 83
Scheme 83

Scheme 84

Scheme 84
Scheme 84
  1. CHECK CONNECTORS Turn the ignition switch off. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. for Power seat: 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. for Manual seat: Check that the connectors are properly connected to the center airbag sensor assembly 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. for Power seat: 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. for Manual seat: Disconnect the connectors from the center airbag sensor assembly and occupant classification ECU. Check that the connector terminals are not damaged. OK The terminals are not deformed or damaged. RESULT Result Proceed to OK A NG (for Power seat) B NG (for Manual seat) C C --> REPLACE NO. 2 FLOOR WIRE B --> REPLACE WIRE HARNESS A: Go to next step
  2. CHECK VEHICLE CONDITION Check the passenger seat type. Result A for Manual seat B for Power seat B --> See step 12 A: Go to next step
  3. CHECK NO. 2 FLOOR WIRE (SHORT TO B+) Disconnect the connector from the center airbag sensor assembly and occupant classification ECU. Connect the cable to the negative (-) battery terminal. Turn the ignition switch to ON. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition M14-8 (FSR+) - Body ground Ignition switch ON Below 1 V M14-4 (FSR-) - Body ground Ignition switch ON Below 1 V TEXT IN ILLUSTRATION *1 Occupant Classification ECU *2 Center Airbag Sensor Assembly *3 No. 2 Floor Wire *4 Front view of wire harness connector (to Occupant Classification ECU) *5 Connector C NG --> REPLACE NO. 2 FLOOR WIRE OK: Go to next step
  4. CHECK NO. 2 FLOOR WIRE (OPEN) Turn the ignition switch off. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. Using SST, connect terminals 12 (FSP+) and 13 (FSP-) of connector B. NOTE: Do not forcibly insert SST into the terminals of the connector when connecting. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition M14-8 (FSR+) - M14-4 (FSR-) Always Below 1 ohms TEXT IN ILLUSTRATION *1 Occupant Classification ECU *2 Center Airbag Sensor Assembly *3 No. 2 Floor Wire *4 Front view of wire harness connector (to Center Airbag Sensor Assembly) *5 Front view of wire harness connector (to Occupant Classification ECU) *6 Connector B *7 Connector C - - NG --> REPLACE NO. 2 FLOOR WIRE OK: Go to next step
  5. CHECK NO. 2 FLOOR WIRE (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 M14-8 (FSR+) - M14-4 (FSR-) Always 1 Mohms or higher TEXT IN ILLUSTRATION *1 Occupant Classification ECU *2 Center Airbag Sensor Assembly *3 No. 2 Floor Wire *4 Front view of wire harness connector (to Occupant Classification ECU) *5 Connector C NG --> REPLACE NO. 2 FLOOR WIRE OK: Go to next step
  6. CHECK NO. 2 FLOOR WIRE (SHORT TO GROUND) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition M14-8 (FSR+) - Body ground Always 1 Mohms or higher M14-4 (FSR-) - Body ground Always 1 Mohms or higher TEXT IN ILLUSTRATION *1 Occupant Classification ECU *2 Center Airbag Sensor Assembly *3 No. 2 Floor Wire *4 Front view of wire harness connector (to Occupant Classification ECU) *5 Connector C NG --> REPLACE NO. 2 FLOOR WIRE OK: Go to next step
  7. RECHECK 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 ignition switch to ON. Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . Clear the DTCs stored in the center airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(ref-394836-S16636379082011040800000) . Turn the ignition switch off. Turn the ignition switch to ON. Using the Techstream, check the DTCs of the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . 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. OK --> See step 8 OK --> See step 30
  8. REPLACE OCCUPANT CLASSIFICATION ECU Turn the ignition switch off. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. Replace the occupant classification ECU. Refer to «REMOVAL»(ref-394612-S06806897562011040800000) . HINT: Perform the inspection using parts from a normal vehicle if possible. 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 ignition switch to ON. Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(ref-394630-S42267469492011040800000) . 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»(ref-394630-S42267469492011040800000) . Standard 27 to 33 kg (59.52 to 72.8 lb) NEXT: Go to next step
  11. RECHECK DTC Turn the ignition switch to ON. Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . Clear the DTCs stored in the center airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(ref-394836-S16636379082011040800000) . Turn the ignition switch off. Turn the ignition switch to ON. Using the Techstream, check the DTCs of the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . 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 29 OK --> END
  12. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (SHORT TO B+) Connect the connectors that link the front seat wire RH and No. 2 floor wire. Connect the cable to the negative (-) battery terminal. Turn the ignition switch to ON. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition S12-8 (FSR+) - Body ground Ignition switch ON Below 1 V S12-4 (FSR-) - Body ground Ignition switch ON Below 1 V TEXT IN ILLUSTRATION *1 Occupant Classification ECU *2 Center Airbag Sensor Assembly *3 Junction Connector *4 Front view of wire harness connector (to Occupant Classification ECU) *5 Connector E NG --> See step 21 OK: Go to next step
  13. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (OPEN) Turn the ignition switch off. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. Using SST, connect terminals 12 (FSP+) and 13 (FSP-) of connector B. NOTE: Do not forcibly insert SST wire into the terminals of the connector when connecting. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition S12-8 (FSR+) - S12-4 (FSR-) Always Below 1 ohms TEXT IN ILLUSTRATION *1 Occupant Classification ECU *2 Center Airbag Sensor Assembly *3 Junction Connector *4 Front view of wire harness connector (to Center Airbag Sensor Assembly) *5 Front view of wire harness connector (to Occupant Classification ECU) *6 Connector B *7 Connector E - - NG --> See step 23 OK: Go to next step
  14. 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 S12-8 (FSR+) - S12-4 (FSR-) Always 1 Mohms or higher TEXT IN ILLUSTRATION *1 Occupant Classification ECU *2 Center Airbag Sensor Assembly *3 Junction Connector *4 Front view of wire harness connector (to Occupant Classification ECU) *5 Connector E NG --> See step 24 OK: Go to next step
  15. 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 S12-8 (FSR+) - Body ground Always 1 Mohms or higher S12-4 (FSR-) - Body ground Always 1 Mohms or higher TEXT IN ILLUSTRATION *1 Occupant Classification ECU *2 Center Airbag Sensor Assembly *3 Junction Connector *4 Front view of wire harness connector (to Occupant Classification ECU) *5 Connector E NG --> See step 25 OK: Go to next step
  16. RECHECK 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 ignition switch to ON. Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . Clear the DTCs stored in the center airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(ref-394836-S16636379082011040800000) . Turn the ignition switch off. Turn the ignition switch to ON. Using the Techstream, check the DTCs of the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . 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 17 OK --> See step 30
  17. REPLACE OCCUPANT CLASSIFICATION ECU Turn the ignition switch off. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. Replace the occupant classification ECU. Refer to «REMOVAL»(ref-394612-S06806897562011040800000) . HINT: Perform the inspection using parts from a normal vehicle if possible. NEXT: Go to next step
  18. PERFORM ZERO POINT CALIBRATION Connect the cable to the negative (-) battery terminal. Connect the Techstream to the DLC3. Turn the ignition switch to ON. Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(ref-394630-S42267469492011040800000) . OK "Zero Point Calibration is complete." is displayed. NEXT: Go to next step
  19. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(ref-394630-S42267469492011040800000) . Standard 27 to 33 kg (59.5 to 72.8 lb) NEXT: Go to next step
  20. RECHECK DTC Turn the ignition switch to ON. Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . Clear the DTCs stored in the center airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(ref-394836-S16636379082011040800000) . Turn the ignition switch off. Turn the ignition switch to ON. Using the Techstream, check the DTCs of the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . 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 29 OK --> END
  21. CHECK NO. 2 FLOOR WIRE (SHORT TO B+) Turn the ignition switch off. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. Disconnect the junction connector from the No. 2 floor wire. Connect the cable to the negative (-) battery terminal. Turn the ignition switch to ON. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition M26-13 (FSR+) - Body ground Ignition switch ON Below 1 V M26-14 (FSR-) - Body ground Ignition switch ON Below 1 V TEXT IN ILLUSTRATION *1 Occupant Classification ECU *2 Center Airbag Sensor Assembly *3 Front Seat Wire RH *4 Junction Connector *5 No. 2 Floor Wire *6 Front view of wire harness connector (to Junction Connector) *7 Connector C NG --> REPLACE NO. 2 FLOOR WIRE OK: Go to next step
  22. CHECK FRONT SEAT WIRE RH (SHORT TO B+) Turn the ignition switch off. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. Disconnect the front seat wire RH connector from the junction connector. Connect the cable to the negative (-) battery terminal. Turn the ignition switch to ON. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition S14-14 (FSR+) - Body ground Ignition switch ON Below 1 V S14-13 (FSR-) - Body ground Ignition switch ON Below 1 V TEXT IN ILLUSTRATION *1 Occupant Classification ECU *2 Center Airbag Sensor Assembly *3 Front Seat Wire RH *4 Junction Connector *5 No. 2 Floor Wire *6 Front view of wire harness connector (to Junction Connector) *7 Connector D NG --> REPLACE FRONT SEAT WIRE RH OK --> REPLACE JUNCTION CONNECTOR
  23. CHECK NO. 2 FLOOR WIRE (OPEN) Disconnect the junction 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 M26-13 (FSR+) - M26-14 (FSR-) Always Below 1 ohms TEXT IN ILLUSTRATION *1 Occupant Classification ECU *2 Center Airbag Sensor Assembly *3 Front Seat Wire RH *4 Junction Connector *5 No. 2 Floor Wire *6 Front view of wire harness connector (to Center Airbag Sensor Assembly) *7 Front view of wire harness connector (to Junction Connector) *8 Connector B *9 Connector C - - NG --> REPLACE NO. 2 FLOOR WIRE OK: Go to next step
  24. CHECK FRONT SEAT WIRE RH (OPEN) Disconnect the front seat wire RH connector from the junction connector. Using SST, connect terminals 8 (FSR+) and 4 (FSR-) of connector E. NOTE: Do not forcibly insert SST wire into the terminals of the connector when connecting. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition S14-14 (FSR+) - S14-13 (FSR-) Always Below 1 ohms TEXT IN ILLUSTRATION *1 Occupant Classification ECU *2 Center Airbag Sensor Assembly *3 Front Seat Wire RH *4 Junction Connector *5 No. 2 Floor Wire *6 Front view of wire harness connector (to Junction Connector) *7 Front view of wire harness connector (to Occupant Classification ECU) *8 Connector D *9 Connector E - - NG --> REPLACE FRONT SEAT WIRE RH OK --> REPLACE JUNCTION CONNECTOR
  25. CHECK NO. 2 FLOOR WIRE (SHORT) Disconnect the junction 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 M26-13 (FSR+) - M26-14 (FSR-) Always 1 Mohms or higher TEXT IN ILLUSTRATION *1 Occupant Classification ECU *2 Center Airbag Sensor Assembly *3 Front Seat Wire RH *4 Junction Connector *5 No. 2 Floor Wire *6 Front view of wire harness connector (to Junction Connector) *7 Connector C NG --> REPLACE NO. 2 FLOOR WIRE OK: Go to next step
  26. CHECK FRONT SEAT WIRE RH (SHORT) Disconnect the front seat wire RH connector from the junction connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition S14-14 (FSR+) - S14-13 (FSR-) Always 1 Mohms or higher TEXT IN ILLUSTRATION *1 Occupant Classification ECU *2 Center Airbag Sensor Assembly *3 Front Seat Wire RH *4 Junction Connector *5 No. 2 Floor Wire *6 Front view of wire harness connector (to Junction Connector) *7 Connector D NG --> REPLACE FRONT SEAT WIRE RH OK --> REPLACE JUNCTION CONNECTOR
  27. CHECK NO. 2 FLOOR WIRE (SHORT TO GROUND) Disconnect the junction 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 M26-13 (FSR+) - Body ground Always 1 Mohms or higher M26-14 (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 Junction Connector *5 No. 2 Floor Wire *6 Front view of wire harness connector (to Junction Connector) *7 Connector C NG --> REPLACE NO. 2 FLOOR WIRE OK: Go to next step
  28. CHECK FRONT SEAT WIRE RH (SHORT TO GROUND) Disconnect the front seat wire RH connector from the junction connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition S14-14 (FSR+) - Body ground Always 1 Mohms or higher S14-13 (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 Junction Connector *5 No. 2 Floor Wire *6 Front view of wire harness connector (to Junction Connector) *7 Connector D NG --> REPLACE FRONT SEAT WIRE RH OK --> REPLACE JUNCTION CONNECTOR
  29. REPLACE CENTER AIRBAG SENSOR ASSEMBLY. Refer to «REMOVAL»(ref-394612-S18873158642011040800000)
  30. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-394610-S07332439272011040800000)

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 85

Scheme 85: PROCEDURE
Scheme 85: PROCEDURE

Scheme 86

Scheme 86
Scheme 86
  1. CHECK CONNECTORS Turn the ignition switch off. Disconnect the cable from the negative (-) battery terminal. Check that the connectors are properly connected to the center airbag sensor assembly and the 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 center airbag sensor assembly and the 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 ignition switch to ON. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition S13-5 (SVC3) - Body ground Ignition switch ON Below 1 V S13-6 (SVC4) - Body ground Ignition switch ON Below 1 V S13-11 (SVC1) - Body ground Ignition switch ON Below 1 V S13-12 (SVC2) - Body ground Ignition switch ON 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 ignition 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 S13-5 (SVC3) - Body ground Always 1 Mohms or higher S13-6 (SVC4) - Body ground Always 1 Mohms or higher S13-11 (SVC1) - Body ground Always 1 Mohms or higher S13-12 (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 S13-5 (SVC3) - S5-1 (SVC3) Always Below 1 ohms S13-6 (SVC4) - S6-1 (SVC4) Always Below 1 ohms S13-11 (SVC1) - S3-1 (SVC1) Always Below 1 ohms S13-12 (SVC2) - S4-1 (SVC2) Always Below 1 ohms TEXT IN ILLUSTRATION *1 Front LH *2 Front RH *3 Rear LH *4 Rear RH *5 Front view of wire harness connector (to Occupant Classification Sensor) *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 S13-5 (SVC3) - S13-6 (SVC4) Always 1 Mohms or higher S13-5 (SVC3) - S13-11 (SVC1) Always 1 Mohms or higher S13-5 (SVC3) - S13-12 (SVC2) Always 1 Mohms or higher S13-6 (SVC4) - S13-11 (SVC1) Always 1 Mohms or higher S13-6 (SVC4) - S13-12 (SVC2) Always 1 Mohms or higher S13-11 (SVC1) - S13-12 (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 the 4 occupant classification sensors. Connect the cable to the negative (-) battery terminal. Turn the ignition switch to ON. Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . Clear the DTCs stored in the center airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(ref-394836-S16636379082011040800000) . Turn the ignition switch off. Turn the ignition switch to ON. Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . 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 14
  7. REPLACE OCCUPANT CLASSIFICATION ECU Turn the ignition switch off. Disconnect the cable from the negative (-) battery terminal. Replace the occupant classification ECU. Refer to «REMOVAL»(ref-394612-S06806897562011040800000) . HINT: Perform the inspection using parts from a normal vehicle if possible. 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 ignition switch to ON. Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(ref-394630-S42267469492011040800000) . OK "Zero Point Calibration is complete." is displayed. NG --> See step 11 OK: Go to next step
  9. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(ref-394630-S42267469492011040800000) . Standard 27 to 33 kg (59.5 to 72.8 lb) NG --> See step 11 OK: Go to next step
  10. CHECK DTC Turn the ignition switch to ON. Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . Clear the DTCs stored in the center airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(ref-394836-S16636379082011040800000) . Turn the ignition switch off. Turn the ignition switch to ON. Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . 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 11 OK --> END
  11. REPLACE FRONT SEAT ASSEMBLY RH Turn the ignition switch off. Disconnect the cable from the negative (-) battery terminal. Replace the front seat assembly RH. Refer to «REMOVAL»(ref-394821-S04430307052011040800000) for power seat or. Refer to «REMOVAL»(ref-394821-S07581256872011040800000) for manual seat). NEXT: Go to next step
  12. PERFORM ZERO POINT CALIBRATION Connect the cable to the negative (-) battery terminal. Connect the Techstream to the DLC3. Turn the ignition switch to ON. Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(ref-394630-S42267469492011040800000) . OK "Zero Point Calibration is complete." is displayed. NEXT: Go to next step
  13. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(ref-394630-S42267469492011040800000) . Standard 27 to 33 kg (59.5 to 72.8 lb) NEXT --> END
  14. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-394610-S07332439272011040800000)

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

Scheme 87

Scheme 87: PROCEDURE
Scheme 87: PROCEDURE
  1. CHECK BATTERY Measure the voltage of the battery. Standard Voltage 11 to 14 V NG --> REPLACE BATTERY OK: Go to next step
  2. CHECK WIRE HARNESS (SOURCE VOLTAGE) Turn the ignition 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 ignition switch to ON. Measure the voltage according to the value(s) in the table below. Standard Voltage for Power Seat for Manual Seat Tester Connection Condition Specified Condition S12-1 (+B) - Body ground Always 11 to 14 V S12-7 (IG) - Body ground Ignition switch ON 11 to 14 V Tester Connection Condition Specified Condition M14-1 (+B) - Body ground Always 11 to 14 V M14-7 (IG) - Body ground Ignition switch ON 11 to 14 V Turn the ignition switch off. Measure the resistance according to the value(s) in the table below. Standard Resistance for Power Seat for Manual Seat Tester Connection Condition Specified Condition S12-3 (GND) - Body ground Always Below 1 ohms Tester Connection Condition Specified Condition M14-3 (GND) - Body ground Always Below 1 ohms TEXT IN ILLUSTRATION *1 for Power Seat *2 for Manual Seat *3 Front view of wire harness connector (to Occupant Classification ECU) NG --> REPLACE WIRE HARNESS OK: Go to next step
  3. CHECK DTC Turn the ignition 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 ignition switch to ON. Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . Clear the DTCs stored in the center airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(ref-394836-S16636379082011040800000) . Turn the ignition switch off. Turn the ignition switch to ON, and wait for at least 10 seconds. Using the Techstream, check for DTCs of the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-394630-S27689341872011040800000) . 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 7
  4. REPLACE OCCUPANT CLASSIFICATION ECU Turn the ignition switch off. Disconnect the cable from the negative (-) battery terminal. Replace the occupant classification ECU. Refer to «REMOVAL»(ref-394612-S06806897562011040800000) . 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 ignition switch to ON. Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(ref-394630-S42267469492011040800000) . 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»(ref-394630-S42267469492011040800000) . Standard 27 to 33 kg (59.5 to 72.8 lb) NEXT --> END
  7. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-394610-S07332439272011040800000)

More articles — Occupant Classification System (Diagnostic Codes & Symptom Tests)