Home ReviewsRefund
Home/Lexus/CT/Lexus CT I (2010-2014)/Repair manual/Airbag/Occupant Classification System (Diagnostic Codes & Symptom …
Contents Wiring diagrams Section: Airbag All sections

Occupant Classification System (Diagnostic Codes & Symptom Tests): Diagnosis Lexus CT I

Airbag 17 illustrations ~8032 words

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 342

Scheme 342: PROCEDURE
Scheme 342: PROCEDURE

Scheme 343

Scheme 343
Scheme 343
  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 Switch Condition Specified Condition W4-9 (BSW) - Body ground Power switch on (IG) Below 1 V W4-5 (BGND) - Body ground Power switch on (IG) Below 1 V TEXT IN ILLUSTRATION *1 Front Seat Inner Belt Assembly RH *2 Occupant Detection ECU *3 Front Seat Wire RH *4 Connector B *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) Turn the power switch off. Disconnect the cable from the negative (-) auxiliary battery terminal. Using SST, connect terminals 1 (BSW) and 2 (BGND) of connector C. NOTE: Do not forcibly insert SST into the terminals of the connector when connecting. SST: 09843-18040 Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition W4-9 (BSW) - W4-5 (BGND) Always Below 1 ohms TEXT IN ILLUSTRATION *1 Front Seat Inner Belt Assembly RH *2 Occupant Detection ECU *3 Front Seat Wire RH *4 Connector B *5 Connector C - - *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) Disconnect SST from connector C. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition W4-9 (BSW) - W4-5 (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 *4 Connector B *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 W4-9 (BSW) - Body ground Always 1 Mohms or higher W4-5 (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 *4 Connector B *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. Turn the power switch on (IG). Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR»(ref-568615-S18331892592013072300000) . Clear the DTCs stored in the airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(ref-568761-S06551148112013072300000) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-568615-S18331892592013072300000) . 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. CHECK FRONT SEAT INNER BELT ASSEMBLY RH Turn the power switch off. 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»(ref-568592-S33038158352013072300000) for Manual seat. Refer to «REMOVAL»(ref-568592-S20024442842013072300000) for Power seat). HINT: Perform the following inspection using known good parts from another vehicle if possible. 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»(ref-568615-S18331892592013072300000) . Clear the DTCs stored in the airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(ref-568761-S06551148112013072300000) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-568615-S18331892592013072300000) . 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 DETECTION ECU Turn the power switch off. Disconnect the cable from the negative (-) auxiliary battery terminal. Replace the occupant detection ECU. Refer to «REMOVAL»(ref-568591-S13313485522013072300000) . NEXT: Go to next step
  9. PERFORM ZERO POINT CALIBRATION Connect the cable to the negative (-) auxiliary battery terminal. Turn the power switch on (IG). Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(ref-568615-S13991606862013072300000) . NEXT: Go to next step
  10. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(ref-568615-S13991606862013072300000) . NEXT --> END
  11. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-568589-S05901111982013072300000)

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 344

Scheme 344: PROCEDURE
Scheme 344: PROCEDURE

Scheme 345

Scheme 345
Scheme 345
  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 Switch Condition Specified Condition W3-1 (SGD1) - Body ground Power switch on (IG) Below 1 V W3-7 (SIG1) - Body ground Power switch on (IG) Below 1 V W3-11 (SVC1) - Body ground Power switch on (IG) Below 1 V TEXT IN ILLUSTRATION *1 Front Occupant Classification Sensor LH *2 Occupant Detection ECU *3 Front Seat Wire RH *4 Connector B *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) Turn the power switch off. Disconnect the cable from the negative (-) auxiliary 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 W3-7 (SIG1) - W3-1 (SGD1) Always Below 1 ohms W3-11 (SVC1) - W3-1 (SGD1) Always Below 1 ohms TEXT IN ILLUSTRATION *1 Front Occupant Classification Sensor LH *2 Occupant Detection ECU *3 Front Seat Wire RH *4 Connector B *5 Connector C - - *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) Disconnect SST from connector C. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition W3-7 (SIG1) - W3-1 (SGD1) Always 1 Mohms or higher W3-11 (SVC1) - W3-1 (SGD1) Always 1 Mohms or higher W3-7 (SIG1) - W3-11 (SVC1) Always 1 Mohms or higher TEXT IN ILLUSTRATION *1 Front Occupant Classification Sensor LH *2 Occupant Detection ECU *3 Front Seat Wire RH *4 Connector B *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 W3-1 (SGD1) - Body ground Always 1 Mohms or higher W3-7 (SIG1) - Body ground Always 1 Mohms or higher W3-11 (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 *4 Connector B *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. Turn the power switch on (IG). Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR»(ref-568615-S18331892592013072300000) . Clear the DTCs stored in the airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(ref-568761-S06551148112013072300000) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-568615-S18331892592013072300000) . OK DTC B1780 is not output. HINT: Codes other than DTC B1780 may be output at this time, but they are not related to this check. NG --> See step 7 OK --> See step 10
  7. REPLACE FRONT SEAT CUSHION SPRING ASSEMBLY Turn the power switch off. Disconnect the cable from the negative (-) auxiliary battery terminal. Replace the front seat cushion spring assembly. Refer to «DISASSEMBLY»(ref-568764-S04604509752013072300000) for Manual seat. Refer to «DISASSEMBLY»(ref-568764-S10284912232013072300000) for Power seat). NEXT: Go to next step
  8. PERFORM ZERO POINT CALIBRATION Connect the cable to the negative (-) auxiliary battery terminal. Turn the power switch on (IG). Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(ref-568615-S13991606862013072300000) . NEXT: Go to next step
  9. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(ref-568615-S13991606862013072300000) . NEXT --> END
  10. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-568589-S05901111982013072300000)

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 346

Scheme 346: PROCEDURE
Scheme 346: PROCEDURE

Scheme 347

Scheme 347
Scheme 347
  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 Switch Condition Specified Condition W3-2 (SGD2) - Body ground Power switch on (IG) Below 1 V W3-8 (SIG2) - Body ground Power switch on (IG) Below 1 V W3-12 (SVC2) - Body ground Power switch on (IG) Below 1 V TEXT IN ILLUSTRATION *1 Front Occupant Classification Sensor RH *2 Occupant Detection ECU *3 Front Seat Wire RH *4 Connector B *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) Turn the power switch off. Disconnect the cable from the negative (-) auxiliary 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 W3-8 (SIG2) - W3-2 (SGD2) Always Below 1 ohms W3-12 (SVC2) - W3-2 (SGD2) Always Below 1 ohms TEXT IN ILLUSTRATION *1 Front Occupant Classification Sensor RH *2 Occupant Detection ECU *3 Front Seat Wire RH *4 Connector B *5 Connector C - - *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) Disconnect SST from connector C. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition W3-8 (SIG2) - W3-2 (SGD2) Always 1 Mohms or higher W3-12 (SVC2) - W3-2 (SGD2) Always 1 Mohms or higher W3-8 (SIG2) - W3-12 (SVC2) Always 1 Mohms or higher TEXT IN ILLUSTRATION *1 Front Occupant Classification Sensor RH *2 Occupant Detection ECU *3 Front Seat Wire RH *4 Connector B *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 W3-2 (SGD2) - Body ground Always 1 Mohms or higher W3-8 (SIG2) - Body ground Always 1 Mohms or higher W3-12 (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 *4 Connector B *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. Turn the power switch on (IG). Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR»(ref-568615-S18331892592013072300000) . Clear the DTCs stored in the airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(ref-568761-S06551148112013072300000) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-568615-S18331892592013072300000) . OK DTC B1781 is not output. HINT: Codes other than DTC B1781 may be output at this time, but they are not related to this check. NG --> See step 7 OK --> See step 10
  7. REPLACE FRONT SEAT CUSHION SPRING ASSEMBLY Turn the power switch off. Disconnect the cable from the negative (-) auxiliary battery terminal. Replace the front seat cushion spring assembly. Refer to «DISASSEMBLY»(ref-568764-S04604509752013072300000) for Manual seat. Refer to «DISASSEMBLY»(ref-568764-S10284912232013072300000) for Power seat). NEXT: Go to next step
  8. PERFORM ZERO POINT CALIBRATION Connect the cable to the negative (-) auxiliary battery terminal. Turn the power switch on (IG). Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(ref-568615-S13991606862013072300000) . NEXT: Go to next step
  9. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(ref-568615-S13991606862013072300000) . NEXT --> END
  10. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-568589-S05901111982013072300000)

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 348

Scheme 348: PROCEDURE
Scheme 348: PROCEDURE

Scheme 349

Scheme 349
Scheme 349
  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 Switch Condition Specified Condition W3-3 (SGD3) - Body ground Power switch on (IG) Below 1 V W3-5 (SVC3) - Body ground Power switch on (IG) Below 1 V W3-9 (SIG3) - Body ground Power switch on (IG) Below 1 V TEXT IN ILLUSTRATION *1 Rear Occupant Classification Sensor LH *2 Occupant Detection ECU *3 Front Seat Wire RH *4 Connector B *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) Turn the power switch off. Disconnect the cable from the negative (-) auxiliary 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 W3-5 (SVC3) - W3-3 (SGD3) Always Below 1 ohms W3-9 (SIG3) - W3-3 (SGD3) Always Below 1 ohms TEXT IN ILLUSTRATION *1 Rear Occupant Classification Sensor LH *2 Occupant Detection ECU *3 Front Seat Wire RH *4 Connector B *5 Connector C - - *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) Disconnect SST from connector C. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition W3-5 (SVC3) - W3-3 (SGD3) Always 1 Mohms or higher W3-9 (SIG3) - W3-3 (SGD3) Always 1 Mohms or higher W3-5 (SVC3) - W3-9 (SIG3) Always 1 Mohms or higher TEXT IN ILLUSTRATION *1 Rear Occupant Classification Sensor LH *2 Occupant Detection ECU *3 Front Seat Wire RH *4 Connector B *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 W3-3 (SGD3) - Body ground Always 1 Mohms or higher W3-5 (SVC3) - Body ground Always 1 Mohms or higher W3-9 (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 *4 Connector B *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. Turn the power switch on (IG). Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR»(ref-568615-S18331892592013072300000) . Clear the DTCs stored in the airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(ref-568761-S06551148112013072300000) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-568615-S18331892592013072300000) . OK DTC B1782 is not output. HINT: Codes other than DTC B1782 may be output at this time, but they are not related to this check. NG --> See step 7 OK --> See step 10
  7. REPLACE FRONT SEAT CUSHION SPRING ASSEMBLY Turn the power switch off. Disconnect the cable from the negative (-) auxiliary battery terminal. Replace the front seat cushion spring assembly. Refer to «DISASSEMBLY»(ref-568764-S04604509752013072300000) for Manual seat. Refer to «DISASSEMBLY»(ref-568764-S10284912232013072300000) for Power seat). NEXT: Go to next step
  8. PERFORM ZERO POINT CALIBRATION Connect the cable to the negative (-) auxiliary battery terminal. Turn the power switch on (IG). Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(ref-568615-S13991606862013072300000) . NEXT: Go to next step
  9. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(ref-568615-S13991606862013072300000) . NEXT --> END
  10. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-568589-S05901111982013072300000)

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 350

Scheme 350: PROCEDURE
Scheme 350: PROCEDURE

Scheme 351

Scheme 351
Scheme 351
  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 Switch Condition Specified Condition W3-4 (SGD4) - Body ground Power switch on (IG) Below 1 V W3-6 (SVC4) - Body ground Power switch on (IG) Below 1 V W3-10 (SIG4) - Body ground Power switch on (IG) Below 1 V TEXT IN ILLUSTRATION *1 Rear Occupant Classification Sensor RH *2 Occupant Detection ECU *3 Front Seat Wire RH *4 Connector B *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) Turn the power switch off. Disconnect the cable from the negative (-) auxiliary 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 W3-6 (SVC4) - W3-4 (SGD4) Always Below 1 ohms W3-10 (SIG4) - W3-4 (SGD4) Always Below 1 ohms TEXT IN ILLUSTRATION *1 Rear Occupant Classification Sensor RH *2 Occupant Detection ECU *3 Front Seat Wire RH *4 Connector B *5 Connector C - - *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) Disconnect SST from connector C. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition W3-6 (SVC4) - W3-4 (SGD4) Always 1 Mohms or higher W3-10 (SIG4) - W3-4 (SGD4) Always 1 Mohms or higher W3-6 (SVC4) - W3-10 (SIG4) Always 1 Mohms or higher TEXT IN ILLUSTRATION *1 Rear Occupant Classification Sensor RH *2 Occupant Detection ECU *3 Front Seat Wire RH *4 Connector B *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 W3-4 (SGD4) - Body ground Always 1 Mohms or higher W3-6 (SVC4) - Body ground Always 1 Mohms or higher W3-10 (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 *4 Connector B *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. Turn the power switch on (IG). Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR»(ref-568615-S18331892592013072300000) . Clear the DTCs stored in the airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(ref-568761-S06551148112013072300000) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-568615-S18331892592013072300000) . OK DTC B1783 is not output. HINT: Codes other than DTC B1783 may be output at this time, but they are not related to this check. NG --> See step 7 OK --> See step 10
  7. REPLACE FRONT SEAT CUSHION SPRING ASSEMBLY Turn the power switch off. Disconnect the cable from the negative (-) auxiliary battery terminal. Replace the front seat cushion spring assembly. Refer to «DISASSEMBLY»(ref-568764-S04604509752013072300000) for Manual seat. Refer to «DISASSEMBLY»(ref-568764-S10284912232013072300000) for Power seat). NEXT: Go to next step
  8. PERFORM ZERO POINT CALIBRATION Connect the cable to the negative (-) auxiliary battery terminal. Turn the power switch on (IG). Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(ref-568615-S13991606862013072300000) . NEXT: Go to next step
  9. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(ref-568615-S13991606862013072300000) . NEXT --> END
  10. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-568589-S05901111982013072300000)

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 .

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 .

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 .

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 .

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 352

Scheme 352: PROCEDURE
Scheme 352: PROCEDURE

Scheme 353

Scheme 353
Scheme 353

Scheme 354

Scheme 354
Scheme 354

Scheme 355

Scheme 355
Scheme 355
  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 sensor 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 sensor 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 Switch Condition Specified Condition W4-8 (FSR+) - Body ground Power switch on (IG) Below 1 V W4-4 (FSR-) - Body ground Power switch on (IG) Below 1 V TEXT IN ILLUSTRATION *1 Occupant Detection ECU *2 Airbag Sensor Assembly *3 Connector E *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) 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. Using SST, connect terminals 12 (FSR+) and 13 (FSR-) of connector B. NOTE: Do not forcibly insert SST into the terminals of the connector when connecting. SST: 09843-18040 Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition W4-8 (FSR+) - W4-4 (FSR-) Always Below 1 ohms TEXT IN ILLUSTRATION *1 Occupant Detection ECU *2 Airbag Sensor Assembly *3 Connector B *4 Connector E *a Front view of wire harness connector (to Airbag Sensor 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 SST from connector B. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition W4-8 (FSR+) - W4-4 (FSR-) Always 1 Mohms or higher TEXT IN ILLUSTRATION *1 Occupant Detection ECU *2 Airbag Sensor Assembly *3 Connector E *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 W4-8 (FSR+) - Body ground Always 1 Mohms or higher W4-4 (FSR-) - Body ground Always 1 Mohms or higher TEXT IN ILLUSTRATION *1 Occupant Detection ECU *2 Airbag Sensor Assembly *3 Connector E *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 sensor 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»(ref-568615-S18331892592013072300000) . Clear the DTCs stored in the airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(ref-568761-S06551148112013072300000) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-568615-S18331892592013072300000) . OK DTC B1790 is not output. HINT: Codes other than DTC B1790 may be output at this time, but they are not related to this check. NG --> See step 7 OK --> See step 15
  7. REPLACE OCCUPANT DETECTION ECU Turn the power switch off. Disconnect the cable from the negative (-) auxiliary battery terminals. WARNING: Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system. Replace the occupant detection ECU with a known good one. Refer to «REMOVAL»(ref-568591-S13313485522013072300000) . HINT: Perform the following inspection using known good parts from another vehicle if possible. NEXT: Go to next step
  8. RECHECK DTC Turn the power switch on (IG). Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR»(ref-568615-S18331892592013072300000) . Clear the DTCs stored in the airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(ref-568761-S06551148112013072300000) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-568615-S18331892592013072300000) . OK DTC B1790 is not output. HINT: Codes other than DTC B1790 may be output at this time, but they are not related to this check. NG --> See step 16 OK: Go to next step
  9. PERFORM ZERO POINT CALIBRATION Connect the cable to the negative (-) auxiliary battery terminal. Turn the power switch on (IG). Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(ref-568615-S13991606862013072300000) . NEXT: Go to next step
  10. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(ref-568615-S13991606862013072300000) . NEXT --> END
  11. CHECK NO. 2 FLOOR WIRE (SHORT TO B+) 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. 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 Switch Condition Specified Condition QW2-7 (FSR+) - Body ground Power switch on (IG) Below 1 V QW2-3 (FSR-) - Body ground Power switch on (IG) Below 1 V TEXT IN ILLUSTRATION *1 Occupant Detection ECU *2 Airbag Sensor Assembly *3 Front Seat Wire RH *4 No. 2 Floor Wire *5 Connector C *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: 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 QW2-7 (FSR+) - QW2-3 (FSR-) Always Below 1 ohms TEXT IN ILLUSTRATION *1 Occupant Detection ECU *2 Airbag Sensor Assembly *3 Front Seat Wire RH *4 No. 2 Floor Wire *5 Connector B *6 Connector C *a Front view of wire harness connector (to Airbag Sensor 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 QW2-7 (FSR+) - QW2-3 (FSR-) Always 1 Mohms or higher TEXT IN ILLUSTRATION *1 Occupant Detection ECU *2 Airbag Sensor Assembly *3 Front Seat Wire RH *4 No. 2 Floor Wire *5 Connector C *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 QW2-7 (FSR+) - Body ground Always 1 Mohms or higher QW2-3 (FSR-) - Body ground Always 1 Mohms or higher TEXT IN ILLUSTRATION *1 Occupant Detection ECU *2 Airbag Sensor Assembly *3 Front Seat Wire RH *4 No. 2 Floor Wire *5 Connector C *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»(ref-568589-S05901111982013072300000)
  16. REPLACE AIRBAG SENSOR ASSEMBLY. Refer to «REMOVAL»(ref-568591-S25473923792013072300000)

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 356

Scheme 356: PROCEDURE
Scheme 356: PROCEDURE

Scheme 357

Scheme 357
Scheme 357
  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 Switch Condition Specified Condition W3-5 (SVC3) - Body ground Power switch on (IG) Below 1 V W3-6 (SVC4) - Body ground Power switch on (IG) Below 1 V W3-11 (SVC1) - Body ground Power switch on (IG) Below 1 V W3-12 (SVC2) - Body ground Power switch on (IG) Below 1 V TEXT IN ILLUSTRATION *1 4 Occupant Classification Sensors *2 Occupant Detection ECU *3 Front Seat Wire RH *4 Connector B *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) Turn the power switch off. Disconnect the cable from the negative (-) auxiliary battery terminal. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition W3-5 (SVC3) - Body ground Always 1 Mohms or higher W3-6 (SVC4) - Body ground Always 1 Mohms or higher W3-11 (SVC1) - Body ground Always 1 Mohms or higher W3-12 (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 *4 Connector B *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 W3-5 (SVC3) - W7-1 (SVC3) Always Below 1 ohms W3-6 (SVC4) - W1-1 (SVC4) Always Below 1 ohms W3-11 (SVC1) - W6-1 (SVC1) Always Below 1 ohms W3-12 (SVC2) - W2-1 (SVC2) Always Below 1 ohms TEXT IN ILLUSTRATION *1 4 Occupant Classification Sensors *2 Occupant Detection ECU *3 Front Seat Wire RH *4 Connector B *5 Connector C *6 Front Occupant Classification Sensor LH *7 Rear Occupant Classification Sensor RH *8 Front Occupant Classification Sensor RH *9 Rear Occupant Classification Sensor LH - - *a Front view of wire harness connector (to Occupant Detection ECU) *b Front view of wire harness connector (to 4 Occupant Classification Sensors) 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 W3-5 (SVC3) - W3-6 (SVC4) Always 1 Mohms or higher W3-5 (SVC3) - W3-11 (SVC1) Always 1 Mohms or higher W3-5 (SVC3) - W3-12 (SVC2) Always 1 Mohms or higher W3-6 (SVC4) - W3-11 (SVC1) Always 1 Mohms or higher W3-6 (SVC4) - W3-12 (SVC2) Always 1 Mohms or higher W3-11 (SVC1) - W3-12 (SVC2) Always 1 Mohms or higher TEXT IN ILLUSTRATION *1 4 Occupant Classification Sensors *2 Occupant Detection ECU *3 Front Seat Wire RH *4 Connector B *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. Turn the power switch on (IG). Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR»(ref-568615-S18331892592013072300000) . Clear the DTCs stored in the airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(ref-568761-S06551148112013072300000) . Turn the power switch off. Turn the power switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-568615-S18331892592013072300000) . OK DTC B1793 is not output. HINT: Codes other than DTC B1793 may be output at this time, but they are not related to this check. NG --> See step 7 OK --> See step 10
  7. REPLACE FRONT SEAT CUSHION SPRING ASSEMBLY Turn the power switch off. Disconnect the cable from the negative (-) auxiliary battery terminal. Replace the front seat cushion spring assembly. Refer to «DISASSEMBLY»(ref-568764-S04604509752013072300000) for Manual seat. Refer to «DISASSEMBLY»(ref-568764-S10284912232013072300000) for Power seat). NEXT: Go to next step
  8. PERFORM ZERO POINT CALIBRATION Connect the cable to the negative (-) auxiliary battery terminal. Turn the power switch on (IG). Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(ref-568615-S13991606862013072300000) . NEXT: Go to next step
  9. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(ref-568615-S13991606862013072300000) . NEXT --> END
  10. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-568589-S05901111982013072300000)

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 .

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

Scheme 358

Scheme 358: PROCEDURE
Scheme 358: PROCEDURE
  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 Switch Condition Specified Condition W4-1 (+B) - Body ground Always 11 to 14 V Turn the power switch off. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition W4-3 (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 Turn the power switch off. 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. Turn the power switch on (IG). Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR»(ref-568615-S18331892592013072300000) . Clear the DTCs stored in the airbag sensor assembly. Refer to «DTC CHECK / CLEAR»(ref-568761-S06551148112013072300000) . 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»(ref-568615-S18331892592013072300000) . OK DTC B1794 is not output. HINT: Codes other than DTC B1794 may be output at this time, but they are not related to this check. NG --> See step 4 OK --> See step 8
  4. REPLACE OCCUPANT DETECTION ECU Turn the power switch off. Disconnect the cable from the negative (-) auxiliary battery terminal. Replace the occupant detection ECU. Refer to «REMOVAL»(ref-568591-S13313485522013072300000) . NEXT: Go to next step
  5. PERFORM ZERO POINT CALIBRATION Connect the cable to the negative (-) auxiliary battery terminal. Turn the power switch on (IG). Using the Techstream, perform Zero Point Calibration. Refer to «INITIALIZATION»(ref-568615-S13991606862013072300000) . NEXT: Go to next step
  6. PERFORM SENSITIVITY CHECK Using the Techstream, perform Sensitivity Check. Refer to «INITIALIZATION»(ref-568615-S13991606862013072300000) . NEXT --> END
  7. INSPECT AUXILIARY BATTERY. Refer to «ON-VEHICLE INSPECTION»(ref-568728-S05285491322013072300000)
  8. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-568589-S05901111982013072300000)

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 .

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 .

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 .

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