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Occupant Classification System (Diagnostic Codes & Symptom Tests): Other Lexus IS III

Airbag 6 illustrations ~9827 words

CAUTION / NOTICE / HINT

Note. After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work. Refer to PRECAUTION [04/2013 - ]

HINT

  1. When DTC B1650/32 is stored as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant detection ECU. When DTC B1780 is output, perform troubleshooting for this DTC first.
  2. If troubleshooting (wire harness inspection) is difficult to perform, remove the front passenger seat installation bolts to see under the seat cushion.
  3. 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 42

Scheme 42: PROCEDURE
Scheme 42: PROCEDURE

Scheme 43

Scheme 43
Scheme 43
  1. CHECK CONNECTORS Turn the engine switch off. Disconnect the cable from the negative (-) 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 properly connected, 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. Result Proceed to OK NG Result: 2 NG REPLACE FRONT SEAT WIRE RH Result: 1 OK See step 2
  2. CHECK FRONT SEAT WIRE RH (SHORT TO B+) Connect the cable to the negative (-) battery terminal. *1 Front Occupant Classification Sensor LH *2 Occupant Detection ECU *3 Front Seat Wire RH *a Front view of wire harness connector (to Occupant Detection ECU) Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition a13-1 (SVC1) - Body ground Engine switch on (IG) Below 1 V a13-3 (SIG1) - Body ground Engine switch on (IG) Below 1 V a13-5 (SGD1) - Body ground Engine switch on (IG) Below 1 V Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal. Result Proceed to OK NG Result: 2 NG See step 12 Result: 1 OK See step 3
  3. CHECK FRONT SEAT WIRE RH (OPEN) Using a service wire, connect terminals 1 (SVC) and 3 (SGD), and connect terminals 2 (SIG) and 3 (SGD) of connector C. NOTE: Do not forcibly insert the service wire into the terminals of the connector when connecting the wire. *1 Front Occupant Classification Sensor LH *2 Occupant Detection ECU *3 Front Seat Wire RH *4 Service Wire *a Front view of wire harness connector (to Occupant Detection ECU) *b Front view of wire harness connector (to Front Occupant Classification Sensor LH) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition a13-1 (SVC1) - a13-5 (SGD1) Always Below 1 ohms a13-3 (SIG1) - a13-5 (SGD1) Always Below 1 ohms Disconnect the service wire from connector C. Result Proceed to OK NG Result: 2 NG REPLACE FRONT SEAT WIRE RH Result: 1 OK See step 4
  4. CHECK FRONT SEAT WIRE RH (SHORT) Measure the resistance according to the value(s) in the table below. *1 Front Occupant Classification Sensor LH *2 Occupant Detection ECU *3 Front Seat Wire RH *a Front view of wire harness connector (to Occupant Detection ECU) Standard Resistance Tester Connection Condition Specified Condition a13-1 (SVC1) - a13-5 (SGD1) Always 1 Mohms or higher a13-3 (SIG1) - a13-5 (SGD1) Always 1 Mohms or higher a13-1 (SVC1) - a13-3 (SIG1) Always 1 Mohms or higher Result Proceed to OK NG Result: 2 NG REPLACE FRONT SEAT WIRE RH Result: 1 OK See step 5
  5. CHECK FRONT SEAT WIRE RH (SHORT TO GROUND) Measure the resistance according to value(s) in the table below. *1 Front Occupant Classification Sensor LH *2 Occupant Detection ECU *3 Front Seat Wire RH *a Front view of wire harness connector (to Occupant Detection ECU) Standard Resistance Tester Connection Condition Specified Condition a13-1 (SVC1) - Body ground Always 1 Mohms or higher a13-3 (SIG1) - Body ground Always 1 Mohms or higher a13-5 (SGD1) - Body ground Always 1 Mohms or higher Result Proceed to OK NG Result: 2 NG REPLACE FRONT SEAT WIRE RH Result: 1 OK See step 6
  6. CHECK DTC Connect the connectors to the occupant detection ECU and front occupant classification sensor LH. Connect the cable to the negative (-) battery terminal. Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665567-S03038647982014102400000) Body Electrical > Occupant Detection > Clear DTCs Clear the DTCs stored in the airbag sensor assembly. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665792-S03803756002014102400000) Body Electrical > SRS Airbag > Clear DTCs Turn the engine switch off. Turn the engine switch on (IG), and wait for at least 10 seconds. Check for DTCs. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665567-S03038647982014102400000) Body Electrical > Occupant Detection > Trouble Codes OK DTC B1780 is not output. HINT: Codes other than DTC B1780 may be output at this time, but they are not related to this check. Turn the engine switch off. Result Proceed to OK NG Result: 1 OK USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665529-S21853141262014102400000) Result: 2 NG See step 7
  7. CHECK OCCUPANT DETECTION ECU Disconnect the cable from the negative (-) battery terminal. Replace the occupant detection ECU with a known good one. Refer to «REMOVAL [04/2013 - ]»(ref-665530-S23053807092014102400000) HINT: Perform the following inspection using known good parts from another vehicle if possible. Connect the cable to the negative (-) battery terminal. Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665567-S03038647982014102400000) Body Electrical > Occupant Detection > Clear DTCs Clear the DTCs stored in the airbag sensor assembly. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665792-S03803756002014102400000) Body Electrical > SRS Airbag > Clear DTCs Turn the engine switch off. Turn the engine switch on (IG), and wait for at least 10 seconds. Check for DTCs. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665567-S03038647982014102400000) Body Electrical > Occupant Detection > Trouble Codes OK DTC B1780 is not output. HINT: Codes other than DTC B1780 may be output at this time, but they are not related to this check. Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal. Restore the occupant detection ECU that was installed for testing to its original location. Refer to «REMOVAL [04/2013 - ]»(ref-665530-S23053807092014102400000) Result Proceed to OK NG Result: 2 NG See step 10 Result: 1 OK See step 8
  8. REPLACE OCCUPANT DETECTION ECU Disconnect the cable from the negative (-) battery terminal. Replace the occupant detection ECU with a new one. Refer to «REMOVAL [04/2013 - ]»(ref-665530-S23053807092014102400000) Connect the cable to the negative (-) battery terminal. Result Proceed to NEXT Result: 1 NEXT See step 9
  9. PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK Using the Techstream, perform Zero Point Calibration and Sensitivity Check. Refer to «INITIALIZATION [04/2013 - ]»(ref-665567-S31448154542014102400000) Body Electrical > Occupant Detection > Utility Tester Display Zero Point Calibration & Sensitivity Check Result Proceed to NEXT Result: 1 NEXT END
  10. REPLACE FRONT OCCUPANT CLASSIFICATION SENSOR LH (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY RH) Disconnect the cable from the negative (-) battery terminal. Replace the separate type front seat cushion spring assembly RH. Refer to «REMOVAL [04/2013 - ]»(ref-665743-S20114744952014102400000) Connect the cable to the negative (-) battery terminal. Result Proceed to NEXT Result: 1 NEXT See step 11
  11. PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK Using the Techstream, perform Zero Point Calibration and Sensitivity Check. Refer to «INITIALIZATION [04/2013 - ]»(ref-665567-S31448154542014102400000) Body Electrical > Occupant Detection > Utility Tester Display Zero Point Calibration & Sensitivity Check Result Proceed to NEXT Result: 1 NEXT END
  12. REPLACE FRONT OCCUPANT CLASSIFICATION SENSOR LH (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY RH) Disconnect the cable from the negative (-) battery terminal. Replace the separate type front seat cushion spring assembly RH. Refer to «REMOVAL [04/2013 - ]»(ref-665743-S20114744952014102400000) NOTE: Replace the front seat wire RH at the same time. HINT: When the front seat wire RH has a short to B+, the front occupant classification sensor LH will be damaged. Therefore, replace the front seat wire RH and separate type front seat cushion spring assembly RH, which includes the front occupant classification sensor LH. Connect the cable to the negative (-) battery terminal. Result Proceed to NEXT Result: 1 NEXT See step 13
  13. PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK Using the Techstream, perform Zero Point Calibration and Sensitivity Check. Refer to «INITIALIZATION [04/2013 - ]»(ref-665567-S31448154542014102400000) Body Electrical > Occupant Detection > Utility Tester Display Zero Point Calibration & Sensitivity Check Result Proceed to NEXT Result: 1 NEXT END

Note. After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work. Refer to PRECAUTION [04/2013 - ]

HINT

  1. When DTC B1650/32 is stored as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant detection ECU. When DTC B1782 is output, perform troubleshooting for this DTC first.
  2. If troubleshooting (wire harness inspection) is difficult to perform, remove the front passenger seat installation bolts to see under the seat cushion.
  3. 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 44

Scheme 44: PROCEDURE
Scheme 44: PROCEDURE
  1. CHECK CONNECTORS Turn the engine switch off. Disconnect the cable from the negative (-) 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 properly connected, 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. Result Proceed to OK NG Result: 2 NG REPLACE FRONT SEAT WIRE RH Result: 1 OK See step 2
  2. CHECK FRONT SEAT WIRE RH (SHORT TO B+) Connect the cable to the negative (-) battery terminal. *1 Rear Occupant Classification Sensor LH *2 Occupant Detection ECU *3 Front Seat Wire RH *a Front view of wire harness connector (to Occupant Detection ECU) Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition a13-2 (SVC3) - Body ground Engine switch on (IG) Below 1 V a13-4 (SIG3) - Body ground Engine switch on (IG) Below 1 V a13-6 (SGD3) - Body ground Engine switch on (IG) Below 1 V Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal. Result Proceed to OK NG Result: 2 NG See step 12 Result: 1 OK See step 3
  3. CHECK FRONT SEAT WIRE RH (OPEN) Using a service wire, connect terminals 1 (SVC) and 3 (SGD), and connect terminals 2 (SIG) and 3 (SGD) of connector C. NOTE: Do not forcibly insert the service wire into the terminals of the connector when connecting the wire. *1 Rear Occupant Classification Sensor LH *2 Occupant Detection ECU *3 Front Seat Wire RH *4 Service Wire *a Front view of wire harness connector (to Occupant Detection ECU) *b Front view of wire harness connector (to Rear Occupant Classification Sensor LH) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition a13-2 (SVC3) - a13-6 (SGD3) Always Below 1 ohms a13-4 (SIG3) - a13-6 (SGD3) Always Below 1 ohms Disconnect the service wire from connector C. Result Proceed to OK NG Result: 2 NG REPLACE FRONT SEAT WIRE RH Result: 1 OK See step 4
  4. CHECK FRONT SEAT WIRE RH (SHORT) Measure the resistance according to the value(s) in the table below. *1 Rear Occupant Classification Sensor LH *2 Occupant Detection ECU *3 Front Seat Wire RH *a Front view of wire harness connector (to Occupant Detection ECU) Standard Resistance Tester Connection Condition Specified Condition a13-2 (SVC3) - a13-6 (SGD3) Always 1 Mohms or higher a13-4 (SIG3) - a13-6 (SGD3) Always 1 Mohms or higher a13-2 (SVC3) - a13-4 (SIG3) Always 1 Mohms or higher Result Proceed to OK NG Result: 2 NG REPLACE FRONT SEAT WIRE RH Result: 1 OK See step 5
  5. CHECK FRONT SEAT WIRE RH (SHORT TO GROUND) Measure the resistance according to value(s) in the table below. *1 Rear Occupant Classification Sensor LH *2 Occupant Detection ECU *3 Front Seat Wire RH *a Front view of wire harness connector (to Occupant Detection ECU) Standard Resistance Tester Connection Condition Specified Condition a13-2 (SVC3) - Body ground Always 1 Mohms or higher a13-4 (SIG3) - Body ground Always 1 Mohms or higher a13-6 (SGD3) - Body ground Always 1 Mohms or higher Result Proceed to OK NG Result: 2 NG REPLACE FRONT SEAT WIRE RH Result: 1 OK See step 6
  6. CHECK DTC Connect the connectors to the occupant detection ECU and rear occupant classification sensor LH. Connect the cable to the negative (-) battery terminal. Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665567-S03038647982014102400000) Body Electrical > Occupant Detection > Clear DTCs Clear the DTCs stored in the airbag sensor assembly. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665792-S03803756002014102400000) Body Electrical > SRS Airbag > Clear DTCs Turn the engine switch off. Turn the engine switch on (IG), and wait for at least 10 seconds. Check for DTCs. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665567-S03038647982014102400000) Body Electrical > Occupant Detection > Trouble Codes OK DTC B1782 is not output. HINT: Codes other than DTC B1782 may be output at this time, but they are not related to this check. Turn the engine switch off. Result Proceed to OK NG Result: 1 OK USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665529-S21853141262014102400000) Result: 2 NG See step 7
  7. CHECK OCCUPANT DETECTION ECU Disconnect the cable from the negative (-) battery terminal. Replace the occupant detection ECU with a known good one. Refer to «REMOVAL [04/2013 - ]»(ref-665530-S23053807092014102400000) HINT: Perform the following inspection using known good parts from another vehicle if possible. Connect the cable to the negative (-) battery terminal. Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665567-S03038647982014102400000) Body Electrical > Occupant Detection > Clear DTCs Clear the DTCs stored in the airbag sensor assembly. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665792-S03803756002014102400000) Body Electrical > SRS Airbag > Clear DTCs Turn the engine switch off. Turn the engine switch on (IG), and wait for at least 10 seconds. Check for DTCs. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665567-S03038647982014102400000) Body Electrical > Occupant Detection > Trouble Codes OK DTC B1782 is not output. HINT: Codes other than DTC B1782 may be output at this time, but they are not related to this check. Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal. Restore the occupant detection ECU that was installed for testing to its original location. Refer to «REMOVAL [04/2013 - ]»(ref-665530-S23053807092014102400000) Result Proceed to OK NG Result: 2 NG See step 10 Result: 1 OK See step 8
  8. REPLACE OCCUPANT DETECTION ECU Disconnect the cable from the negative (-) battery terminal. Replace the occupant detection ECU with a new one. Refer to «REMOVAL [04/2013 - ]»(ref-665530-S23053807092014102400000) Connect the cable to the negative (-) battery terminal. Result Proceed to NEXT Result: 1 NEXT See step 9
  9. PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK Using the Techstream, perform Zero Point Calibration and Sensitivity Check. Refer to «INITIALIZATION [04/2013 - ]»(ref-665567-S31448154542014102400000) Body Electrical > Occupant Detection > Utility Tester Display Zero Point Calibration & Sensitivity Check Result Proceed to NEXT Result: 1 NEXT END
  10. REPLACE REAR OCCUPANT CLASSIFICATION SENSOR LH (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY RH) Disconnect the cable from the negative (-) battery terminal. Replace the separate type front seat cushion spring assembly RH. Refer to «REMOVAL [04/2013 - ]»(ref-665743-S20114744952014102400000) Connect the cable to the negative (-) battery terminal. Result Proceed to NEXT Result: 1 NEXT See step 11
  11. PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK Using the Techstream, perform Zero Point Calibration and Sensitivity Check. Refer to «INITIALIZATION [04/2013 - ]»(ref-665567-S31448154542014102400000) Body Electrical > Occupant Detection > Utility Tester Display Zero Point Calibration & Sensitivity Check Result Proceed to NEXT Result: 1 NEXT END
  12. REPLACE REAR OCCUPANT CLASSIFICATION SENSOR LH (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY RH) Disconnect the cable from the negative (-) battery terminal. Replace the separate type front seat cushion spring assembly RH. Refer to «REMOVAL [04/2013 - ]»(ref-665743-S20114744952014102400000) NOTE: Replace the front seat wire RH at the same time. HINT: When the front seat wire RH has a short to B+, the rear occupant classification sensor LH will be damaged. Therefore, replace the front seat wire RH and the separate type front seat cushion spring assembly RH, which includes the rear occupant classification sensor LH. Connect the cable to the negative (-) battery terminal. Result Proceed to NEXT Result: 1 NEXT See step 13
  13. PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK Using the Techstream, perform Zero Point Calibration and Sensitivity Check. Refer to «INITIALIZATION [04/2013 - ]»(ref-665567-S31448154542014102400000) Body Electrical > Occupant Detection > Utility Tester Display Zero Point Calibration & Sensitivity Check Result Proceed to NEXT Result: 1 NEXT END

Note. After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work. Refer to PRECAUTION [04/2013 - ]

HINT

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

PROCEDURE

  1. PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK Using the Techstream, perform Zero Point Calibration and Sensitivity Check. Refer to «INITIALIZATION [04/2013 - ]»(ref-665567-S31448154542014102400000) Body Electrical > Occupant Detection > Utility Tester Display Zero Point Calibration & Sensitivity Check OK "Zero Point Calibration is complete." and "Sensitivity Check is complete." are displayed. Result Proceed to OK NG Result: 2 NG See step 5 Result: 1 OK See step 2
  2. CHECK DTC Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665567-S03038647982014102400000) Body Electrical > Occupant Detection > Clear DTCs Clear the DTCs stored in the airbag sensor assembly. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665792-S03803756002014102400000) Body Electrical > SRS Airbag > Clear DTCs Turn the engine switch off. Turn the engine switch on (IG), and wait for at least 10 seconds. Check for DTCs. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665567-S03038647982014102400000) Body Electrical > Occupant Detection > Trouble Codes OK DTC B1785 is not output. HINT: Codes other than DTC B1785 may be output at this time, but they are not related to this check. Turn the engine switch off. Result Proceed to OK NG Result: 1 OK END Result: 2 NG See step 3
  3. REPLACE FRONT OCCUPANT CLASSIFICATION SENSOR LH (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY RH) Disconnect the cable from the negative (-) battery terminal. Replace the separate type front seat cushion spring assembly RH. Refer to «REMOVAL [04/2013 - ]»(ref-665743-S20114744952014102400000) Connect the cable to the negative (-) battery terminal. Result Proceed to NEXT Result: 1 NEXT See step 4
  4. PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK Using the Techstream, perform Zero Point Calibration and Sensitivity Check. Refer to «INITIALIZATION [04/2013 - ]»(ref-665567-S31448154542014102400000) Body Electrical > Occupant Detection > Utility Tester Display Zero Point Calibration & Sensitivity Check Result Proceed to NEXT Result: 1 NEXT END
  5. REPLACE FRONT OCCUPANT CLASSIFICATION SENSOR LH (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY RH) Disconnect the cable from the negative (-) battery terminal. Replace the separate type front seat cushion spring assembly RH. Refer to «REMOVAL [04/2013 - ]»(ref-665743-S20114744952014102400000) Connect the cable to the negative (-) battery terminal. Result Proceed to NEXT Result: 1 NEXT See step 6
  6. PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK Using the Techstream, perform Zero Point Calibration and Sensitivity Check. Refer to «INITIALIZATION [04/2013 - ]»(ref-665567-S31448154542014102400000) Body Electrical > Occupant Detection > Utility Tester Display Zero Point Calibration & Sensitivity Check Result Proceed to NEXT Result: 1 NEXT END

Note. After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work. Refer to PRECAUTION [04/2013 - ]

  1. REPLACE OCCUPANT DETECTION ECU Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal. Replace the occupant detection ECU. Refer to «REMOVAL [04/2013 - ]»(ref-665530-S23053807092014102400000) Connect the cable to the negative (-) battery terminal. Result Proceed to NEXT Result: 1 NEXT See step 2
  2. PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK Using the Techstream, perform Zero Point Calibration and Sensitivity Check. Refer to «INITIALIZATION [04/2013 - ]»(ref-665567-S31448154542014102400000) Body Electrical > Occupant Detection > Utility Tester Display Zero Point Calibration & Sensitivity Check Result Proceed to NEXT Result: 1 NEXT END

Note. After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work. Refer to PRECAUTION [04/2013 - ]

HINT

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

  1. REPLACE OCCUPANT DETECTION ECU Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal. Replace the occupant detection ECU. Refer to «REMOVAL [04/2013 - ]»(ref-665530-S23053807092014102400000) Connect the cable to the negative (-) battery terminal. Result Proceed to NEXT Result: 1 NEXT See step 2
  2. PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK Using the Techstream, perform Zero Point Calibration and Sensitivity Check. Refer to «INITIALIZATION [04/2013 - ]»(ref-665567-S31448154542014102400000) Body Electrical > Occupant Detection > Utility Tester Display Zero Point Calibration & Sensitivity Check Result Proceed to NEXT Result: 1 NEXT END

Note. After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work. Refer to PRECAUTION [04/2013 - ] Inspect the fuses for circuits related to this system before performing the following procedure.

HINT

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

  1. CHECK BATTERY VOLTAGE Measure the voltage of the battery. Standard Voltage 11 to 14 V Result Proceed to OK NG Result: 2 NG INSPECT CHARGING SYSTEM AND BATTERY for 2GR-FSE: Refer to «ON-VEHICLE INSPECTION [04/2013 - ]»(ref-665710-S19859479582014102400000) for 4GR-FSE: Refer to «ON-VEHICLE INSPECTION [04/2013 - ]»(ref-665711-S19112603242014102400000) Result: 1 OK See step 2
  2. CHECK WIRE HARNESS (SOURCE VOLTAGE) Turn the engine switch off. *a Front view of wire harness connector (to Occupant Detection ECU) Disconnect the cable from the negative (-) battery terminal. Disconnect the connector from the occupant detection ECU. Connect the cable to the negative (-) battery terminal. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition a14-1 (+B) - Body ground Always 11 to 14 V Turn the engine switch off. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition a14-3 (GND) - Body ground Always Below 1 ohms Result Proceed to OK NG Result: 2 NG REPLACE WIRE HARNESS Result: 1 OK See step 3
  3. CHECK DTC Disconnect the cable from the negative (-) battery terminal. Connect the connector to the occupant detection ECU. Connect the cable to the negative (-) battery terminal. Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665567-S03038647982014102400000) Body Electrical > Occupant Detection > Clear DTCs Clear the DTCs stored in the airbag sensor assembly. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665792-S03803756002014102400000) Body Electrical > SRS Airbag > Clear DTCs Turn the engine switch off. Turn the engine switch on (IG), and wait for at least 10 seconds. Check for DTCs. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665567-S03038647982014102400000) Body Electrical > Occupant Detection > Trouble Codes OK DTC B1794 is not output. HINT: Codes other than DTC B1794 may be output at this time, but they are not related to this check. Turn the engine switch off. Result Proceed to OK NG Result: 1 OK USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665529-S21853141262014102400000) Result: 2 NG See step 4
  4. REPLACE OCCUPANT DETECTION ECU Disconnect the cable from the negative (-) battery terminal. Replace the occupant detection ECU. Refer to «REMOVAL [04/2013 - ]»(ref-665530-S23053807092014102400000) Connect the cable to the negative (-) battery terminal. Result Proceed to NEXT Result: 1 NEXT See step 5
  5. PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK Using the Techstream, perform Zero Point Calibration and Sensitivity Check. Refer to «INITIALIZATION [04/2013 - ]»(ref-665567-S31448154542014102400000) Body Electrical > Occupant Detection > Utility Tester Display Zero Point Calibration & Sensitivity Check Result Proceed to NEXT Result: 1 NEXT END

Note. After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work. Refer to PRECAUTION [04/2013 - ]

HINT

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

  1. PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK Using the Techstream, perform Zero Point Calibration and Sensitivity Check. Refer to «INITIALIZATION [04/2013 - ]»(ref-665567-S31448154542014102400000) Body Electrical > Occupant Detection > Utility Tester Display Zero Point Calibration & Sensitivity Check OK "Zero Point Calibration is complete." and "Sensitivity Check is complete." are displayed. Result Proceed to OK NG Result: 2 NG See step 5 Result: 1 OK See step 2
  2. CHECK DTC Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665567-S03038647982014102400000) Body Electrical > Occupant Detection > Clear DTCs Clear the DTCs stored in the airbag sensor assembly. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665792-S03803756002014102400000) Body Electrical > SRS Airbag > Clear DTCs Turn the engine switch off. Turn the engine switch on (IG), and wait for at least 10 seconds. Check for DTCs. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665567-S03038647982014102400000) Body Electrical > Occupant Detection > Trouble Codes OK DTC B1787 is not output. HINT: Codes other than DTC B1787 may be output at this time, but they are not related to this check. Turn the engine switch off. Result Proceed to OK NG Result: 1 OK END Result: 2 NG See step 3
  3. REPLACE REAR OCCUPANT CLASSIFICATION SENSOR LH (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY RH) Disconnect the cable from the negative (-) battery terminal. Replace the separate type front seat cushion spring assembly RH. Refer to «REMOVAL [04/2013 - ]»(ref-665743-S20114744952014102400000) Connect the cable to the negative (-) battery terminal. Result Proceed to NEXT Result: 1 NEXT See step 4
  4. PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK Using the Techstream, perform Zero Point Calibration and Sensitivity Check. Refer to «INITIALIZATION [04/2013 - ]»(ref-665567-S31448154542014102400000) Body Electrical > Occupant Detection > Utility Tester Display Zero Point Calibration & Sensitivity Check Result Proceed to NEXT Result: 1 NEXT END
  5. REPLACE REAR OCCUPANT CLASSIFICATION SENSOR LH (SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY RH) Disconnect the cable from the negative (-) battery terminal. Replace the separate type front seat cushion spring assembly RH. Refer to «REMOVAL [04/2013 - ]»(ref-665743-S20114744952014102400000) Connect the cable to the negative (-) battery terminal. Result Proceed to NEXT Result: 1 NEXT See step 6
  6. PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK Using the Techstream, perform Zero Point Calibration and Sensitivity Check. Refer to «INITIALIZATION [04/2013 - ]»(ref-665567-S31448154542014102400000) Body Electrical > Occupant Detection > Utility Tester Display Zero Point Calibration & Sensitivity Check Result Proceed to NEXT Result: 1 NEXT END

Note. After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work. Refer to PRECAUTION [04/2013 - ]

HINT

  1. When DTC B1650/32 is stored as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant detection ECU. When DTC B1790 is output, perform troubleshooting for this DTC first.
  2. If troubleshooting (wire harness inspection) is difficult to perform, remove the front passenger seat installation bolts to see under the seat cushion.
  3. 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 45

Scheme 45: PROCEDURE
Scheme 45: PROCEDURE

Scheme 46

Scheme 46
Scheme 46
  1. CHECK CONNECTORS Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal. WARNING: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system. Check that the connectors are properly connected to the airbag sensor assembly and occupant detection ECU. Also check that the connectors that link the front seat wire RH and floor wire are properly connected. OK The connectors are properly connected. HINT: If the connectors are not properly connected, 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 floor wire. Check that the terminals of the connectors are not damaged. OK The terminals are not deformed or damaged. Result Proceed to OK NG Result: 2 NG REPLACE WIRE HARNESS Result: 1 OK See step 2
  2. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (SHORT TO B+) Connect the connectors that link the floor wire and front seat wire RH. *1 Occupant Detection ECU *2 Airbag Sensor Assembly *a Front view of wire harness connector (to Occupant Detection ECU) Connect the cable to the negative (-) battery terminal. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition a14-7 (FSR+) - Body ground Engine switch on (IG) Below 1 V a14-4 (FSR-) - Body ground Engine switch on (IG) Below 1 V Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal. WARNING: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system. Result Proceed to OK NG Result: 2 NG See step 13 Result: 1 OK See step 3
  3. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (OPEN) Using a service wire, connect terminals 9 (FSR+) and 17 (FSR-) of connector B. *1 Occupant Detection ECU *2 Airbag Sensor Assembly *3 Service Wire *a Front view of wire harness connector (to Airbag Sensor Assembly) *b Front view of wire harness connector (to Occupant Detection ECU) NOTE: Do not forcibly insert the service wire into the terminals of the connector when connecting the wire. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition a14-7 (FSR+) - a14-4 (FSR-) Always Below 1 ohms Result Proceed to OK NG Result: 2 NG See step 12 Result: 1 OK See step 4
  4. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (SHORT) Disconnect the service wire from connector B. *1 Occupant Detection ECU *2 Airbag Sensor Assembly *a Front view of wire harness connector (to Occupant Detection ECU) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition a14-7 (FSR+) - a14-4 (FSR-) Always 1 Mohms or higher Result Proceed to OK NG Result: 2 NG See step 11 Result: 1 OK See step 5
  5. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (SHORT TO GROUND) Measure the resistance according to the value(s) in the table below. *1 Occupant Detection ECU *2 Airbag Sensor Assembly *a Front view of wire harness connector (to Occupant Detection ECU) Standard Resistance Tester Connection Condition Specified Condition a14-7 (FSR+) - Body ground Always 1 Mohms or higher a14-4 (FSR-) - Body ground Always 1 Mohms or higher Result Proceed to OK NG Result: 3 NG See step 10 Result: 1 OK See step 6
  6. CHECK DTC Connect the connectors to the occupant detection ECU and airbag sensor assembly. Connect the cable to the negative (-) battery terminal. Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665567-S03038647982014102400000) Body Electrical > Occupant Detection > Clear DTCs Clear the DTCs stored in the airbag sensor assembly. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665792-S03803756002014102400000) Body Electrical > SRS Airbag > Clear DTCs Turn the engine switch off. Turn the engine switch on (IG), and wait for at least 10 seconds. Check for DTCs. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665567-S03038647982014102400000) Body Electrical > Occupant Detection > Trouble Codes OK DTC B1790 is not output. HINT: Codes other than DTC B1790 may be output at this time, but they are not related to this check. Turn the engine switch off. Result Proceed to OK NG Result: 1 OK USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665529-S21853141262014102400000) Result: 2 NG See step 7
  7. CHECK OCCUPANT DETECTION ECU Disconnect the cable from the negative (-) battery terminal. Replace the occupant detection ECU with a known good one. Refer to «REMOVAL [04/2013 - ]»(ref-665530-S23053807092014102400000) HINT: Perform the following inspection using known good parts from another vehicle if possible. Connect the cable to the negative (-) battery terminal. Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665567-S03038647982014102400000) Body Electrical > Occupant Detection > Clear DTCs Clear the DTCs stored in the airbag sensor assembly. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665792-S03803756002014102400000) Body Electrical > SRS Airbag > Clear DTCs Turn the engine switch off. Turn the engine switch on (IG), and wait for at least 10 seconds. Check for DTCs. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665567-S03038647982014102400000) Body Electrical > Occupant Detection > Trouble Codes OK DTC B1790 is not output. HINT: Codes other than DTC B1790 may be output at this time, but they are not related to this check. Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal. Restore the occupant detection ECU that was installed for testing to its original location. Refer to «REMOVAL [04/2013 - ]»(ref-665530-S23053807092014102400000) Result Proceed to OK NG Result: 2 NG REPLACE AIRBAG SENSOR ASSEMBLY. Refer to «REMOVAL [04/2013 - ]»(ref-665530-S37464415462014102400000) Result: 1 OK See step 8
  8. REPLACE OCCUPANT DETECTION ECU Disconnect the cable from the negative (-) battery terminal. Replace the occupant detection ECU with a new one. Refer to «REMOVAL [04/2013 - ]»(ref-665530-S23053807092014102400000) Connect the cable to the negative (-) battery terminal. Result Proceed to NEXT Result: 1 NEXT See step 9
  9. PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK Using the Techstream, perform Zero Point Calibration and Sensitivity Check. Refer to «INITIALIZATION [04/2013 - ]»(ref-665567-S31448154542014102400000) Body Electrical > Occupant Detection > Utility Tester Display Zero Point Calibration & Sensitivity Check Result Proceed to NEXT Result: 1 NEXT END
  10. CHECK FLOOR WIRE (SHORT TO GROUND) Disconnect the front seat wire RH connector from the floor wire. *1 Occupant Detection ECU *2 Airbag Sensor Assembly *3 Front Seat Wire RH *4 Floor Wire *a Front view of wire harness connector (to Front Seat Wire RH) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition Pa2-1 (FSR+) - Body ground Always 1 Mohms or higher Pa2-4 (FSR-) - Body ground Always 1 Mohms or higher Result Proceed to OK NG Result: 1 OK REPLACE FRONT SEAT WIRE RH Result: 2 NG REPLACE FLOOR WIRE
  11. CHECK FLOOR WIRE (SHORT) Disconnect the front seat wire RH connector from the floor wire. *1 Occupant Detection ECU *2 Airbag Sensor Assembly *3 Front Seat Wire RH *4 Floor Wire *a Front view of wire harness connector (to Front Seat Wire RH) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition Pa2-1 (FSR+) - Pa2-4 (FSR-) Always 1 Mohms or higher Result Proceed to OK NG Result: 1 OK REPLACE FRONT SEAT WIRE RH Result: 2 NG REPLACE FLOOR WIRE
  12. CHECK FLOOR WIRE (OPEN) Disconnect the front seat wire RH connector from the floor wire. *1 Occupant Detection ECU *2 Airbag Sensor Assembly *3 Front Seat Wire RH *4 Floor Wire *5 Service Wire *a Front view of wire harness connector (to Airbag Sensor Assembly) *b Front view of wire harness connector (to Front Seat Wire RH) HINT: The service wire has already been inserted into connector B. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition Pa2-1 (FSR+) - Pa2-4 (FSR-) Always Below 1 ohms Disconnect the service wire from connector B. Result Proceed to OK NG Result: 1 OK REPLACE FRONT SEAT WIRE RH Result: 2 NG REPLACE FLOOR WIRE
  13. CHECK FLOOR WIRE (SHORT TO B+) Disconnect the front seat wire RH connector from the floor wire. *1 Occupant Detection ECU *2 Airbag Sensor Assembly *3 Front Seat Wire RH *4 Floor Wire *a Front view of wire harness connector (to Front Seat Wire RH) Connect the cable to the negative (-) battery terminal. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition Pa2-1 (FSR+) - Body ground Engine switch on (IG) Below 1 V Pa2-4 (FSR-) - Body ground Engine switch on (IG) Below 1 V Result Proceed to OK NG Result: 1 OK REPLACE FRONT SEAT WIRE RH Result: 2 NG REPLACE FLOOR WIRE

Note. After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work. Refer to PRECAUTION [04/2013 - ]

HINT

  1. When DTC B1650/32 is stored as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant detection ECU. When DTC B1793 is output, perform troubleshooting for this DTC first.
  2. If troubleshooting (wire harness inspection) is difficult to perform, remove the front passenger seat installation bolts to see under the seat cushion.
  3. 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 47

Scheme 47: PROCEDURE
Scheme 47: PROCEDURE
  1. CHECK CONNECTORS Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal. Check that the connectors are properly connected to the front occupant classification sensor LH, rear occupant classification sensor LH and occupant detection ECU. OK The connectors are properly connected. HINT: If the connectors are not properly connected, reconnect the connectors and proceed to the next inspection. Disconnect the connectors from the front occupant classification sensor LH, rear occupant classification sensor LH and occupant detection ECU. Check that the terminals of the connectors are not damaged. OK The terminals are not deformed or damaged. Result Proceed to OK NG Result: 2 NG REPLACE FRONT SEAT WIRE RH Result: 1 OK See step 2
  2. CHECK FRONT SEAT WIRE RH (SHORT TO B+) Connect the cable to the negative (-) battery terminal. *1 Front Occupant Classification Sensor LH *2 Rear Occupant Classification Sensor LH *3 Occupant Detection ECU *4 Front Seat Wire RH *a Front view of wire harness connector (to Occupant Detection ECU) Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition a13-1 (SVC1) - Body ground Engine switch on (IG) Below 1 V a13-2 (SVC3) - Body ground Engine switch on (IG) Below 1 V Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal. Result Proceed to OK NG Result: 2 NG See step 11 Result: 1 OK See step 3
  3. CHECK FRONT SEAT WIRE RH (SHORT) Measure the resistance according to the value(s) in the table below. *1 Front Occupant Classification Sensor LH *2 Rear Occupant Classification Sensor LH *3 Occupant Detection ECU *4 Front Seat Wire RH *a Front view of wire harness connector (to Occupant Detection ECU) Standard Resistance Tester Connection Condition Specified Condition a13-1 (SVC1) - a13-2 (SVC3) Always 1 Mohms or higher Result Proceed to OK NG Result: 2 NG REPLACE FRONT SEAT WIRE RH Result: 1 OK See step 4
  4. CHECK FRONT SEAT WIRE RH (SHORT TO GROUND) Measure the resistance according to the value(s) in the table below. *1 Front Occupant Classification Sensor LH *2 Rear Occupant Classification Sensor LH *3 Occupant Detection ECU *4 Front Seat Wire RH *a Front view of wire harness connector (to Occupant Detection ECU) Standard Resistance Tester Connection Condition Specified Condition a13-1 (SVC1) - Body ground Always 1 Mohms or higher a13-2 (SVC3) - Body ground Always 1 Mohms or higher Result Proceed to OK NG Result: 2 NG REPLACE FRONT SEAT WIRE RH Result: 1 OK See step 5
  5. CHECK DTC Connect the connectors to the occupant detection ECU, front occupant classification sensor LH and rear occupant classification sensor LH. Connect the cable to the negative (-) battery terminal. Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665567-S03038647982014102400000) Body Electrical > Occupant Detection > Clear DTCs Clear the DTCs stored in the airbag sensor assembly. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665792-S03803756002014102400000) Body Electrical > SRS Airbag > Clear DTCs Turn the engine switch off. Turn the engine switch on (IG), and wait for at least 10 seconds. Check for DTCs. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665567-S03038647982014102400000) Body Electrical > Occupant Detection > Trouble Codes OK DTC B1793 is not output. HINT: Codes other than DTC B1793 may be output at this time, but they are not related to this check. Turn the engine switch off. Result Proceed to OK NG Result: 1 OK USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665529-S21853141262014102400000) Result: 2 NG See step 6
  6. CHECK OCCUPANT DETECTION ECU Disconnect the cable from the negative (-) battery terminal. Replace the occupant detection ECU with a known good one. Refer to «REMOVAL [04/2013 - ]»(ref-665530-S23053807092014102400000) HINT: Perform the following inspection using known good parts from another vehicle if possible. Connect the cable to the negative (-) battery terminal. Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665567-S03038647982014102400000) Body Electrical > Occupant Detection > Clear DTCs Clear the DTCs stored in the airbag sensor assembly. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665792-S03803756002014102400000) Body Electrical > SRS Airbag > Clear DTCs Turn the engine switch off. Turn the engine switch on (IG), and wait for at least 10 seconds. Check for DTCs. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665567-S03038647982014102400000) Body Electrical > Occupant Detection > Trouble Codes OK DTC B1793 is not output. HINT: Codes other than DTC B1793 may be output at this time, but they are not related to this check. Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal. Restore the occupant detection ECU that was installed for testing to its original location. Refer to «REMOVAL [04/2013 - ]»(ref-665530-S23053807092014102400000) Result Proceed to OK NG Result: 2 NG See step 9 Result: 1 OK See step 7
  7. REPLACE OCCUPANT DETECTION ECU Disconnect the cable from the negative (-) battery terminal. Replace the occupant detection ECU with a new one. Refer to «REMOVAL [04/2013 - ]»(ref-665530-S23053807092014102400000) Connect the cable to the negative (-) battery terminal. Result Proceed to NEXT Result: 1 NEXT See step 8
  8. PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK Using the Techstream, perform Zero Point Calibration and Sensitivity Check. Refer to «INITIALIZATION [04/2013 - ]»(ref-665567-S31448154542014102400000) Body Electrical > Occupant Detection > Utility Tester Display Zero Point Calibration & Sensitivity Check Result Proceed to NEXT Result: 1 NEXT END
  9. REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY RH Disconnect the cable from the negative (-) battery terminal. Replace the separate type front seat cushion spring assembly RH. Refer to «REMOVAL [04/2013 - ]»(ref-665743-S20114744952014102400000) HINT: The front occupant classification sensor LH and rear occupant classification sensor LH are built into the separate type front seat cushion spring assembly RH. Connect the cable to the negative (-) battery terminal. Result Proceed to NEXT Result: 1 NEXT See step 10
  10. PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK Using the Techstream, perform Zero Point Calibration and Sensitivity Check. Refer to «INITIALIZATION [04/2013 - ]»(ref-665567-S31448154542014102400000) Body Electrical > Occupant Detection > Utility Tester Display Zero Point Calibration & Sensitivity Check Result Proceed to NEXT Result: 1 NEXT END
  11. REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY RH Disconnect the cable from the negative (-) battery terminal. Replace the separate type front seat cushion spring assembly RH. Refer to «REMOVAL [04/2013 - ]»(ref-665743-S20114744952014102400000) NOTE: Replace the front seat wire RH at the same time. HINT: When the front seat wire RH has a short to B+, the front occupant classification sensor LH or rear occupant classification sensor LH will be damaged. Therefore, replace the front seat wire RH and the separate type front seat cushion spring assembly RH, which includes the front occupant classification sensor LH and rear occupant classification sensor LH. Connect the cable to the negative (-) battery terminal. Result Proceed to NEXT Result: 1 NEXT See step 12
  12. PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK Using the Techstream, perform Zero Point Calibration and Sensitivity Check. Refer to «INITIALIZATION [04/2013 - ]»(ref-665567-S31448154542014102400000) Body Electrical > Occupant Detection > Utility Tester Display Zero Point Calibration & Sensitivity Check Result Proceed to NEXT Result: 1 NEXT END

Note. After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work. Refer to PRECAUTION [04/2013 - ]

HINT

  1. When DTC B1650/32 is stored as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant detection ECU. When DTC B1771 is output, perform troubleshooting for this DTC first.
  2. If troubleshooting (wire harness inspection) is difficult to perform, remove the front passenger seat installation bolts to see under the seat cushion.
  3. 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.
  1. CHECK CONNECTORS Turn the engine switch off. Disconnect the cable from the negative (-) 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 properly connected, 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. Result Proceed to OK NG Result: 2 NG REPLACE FRONT SEAT WIRE RH Result: 1 OK See step 2
  2. CHECK FRONT SEAT WIRE RH (SHORT TO B+) Connect the cable to the negative (-) battery terminal. *1 Front Seat Inner Belt Assembly RH *2 Occupant Detection ECU *3 Front Seat Wire RH *a Front view of wire harness connector (to Occupant Detection ECU) Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition a14-8 (BSW) - Body ground Engine switch on (IG) Below 1 V a14-5 (BGND) - Body ground Engine switch on (IG) Below 1 V Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal. Result Proceed to OK NG Result: 2 NG REPLACE FRONT SEAT WIRE RH Result: 1 OK See step 3
  3. CHECK FRONT SEAT WIRE RH (OPEN) Using a service wire, connect terminals 1 (BSW) and 2 (BGND) of connector C. *1 Front Seat Inner Belt Assembly RH *2 Occupant Detection ECU *3 Front Seat Wire RH *4 Service Wire *a Front view of wire harness connector (to Occupant Detection ECU) *b Front view of wire harness connector (to Front Seat Inner Belt Assembly RH) NOTE: Do not forcibly insert the service wire into the terminals of the connector when connecting the wire. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition a14-8 (BSW) - a14-5 (BGND) Always Below 1 ohms Disconnect the service wire from connector C. Result Proceed to OK NG Result: 2 NG REPLACE FRONT SEAT WIRE RH Result: 1 OK See step 4
  4. CHECK FRONT SEAT WIRE RH (SHORT) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition a14-8 (BSW) - a14-5 (BGND) Always 1 Mohms or higher *1 Front Seat Inner Belt Assembly RH *2 Occupant Detection ECU *3 Front Seat Wire RH *a Front view of wire harness connector (to Occupant Detection ECU) Result Proceed to OK NG Result: 2 NG REPLACE FRONT SEAT WIRE RH Result: 1 OK See step 5
  5. CHECK FRONT SEAT WIRE RH (SHORT TO GROUND) Measure the resistance according to the value(s) in the table below. *1 Front Seat Inner Belt Assembly RH *2 Occupant Detection ECU *3 Front Seat Wire RH *a Front view of wire harness connector (to Occupant Detection ECU) Standard Resistance Tester Connection Condition Specified Condition a14-8 (BSW) - Body ground Always 1 Mohms or higher a14-5 (BGND) - Body ground Always 1 Mohms or higher Result Proceed to OK NG Result: 2 NG REPLACE FRONT SEAT WIRE RH Result: 1 OK See step 6
  6. CHECK DTC Connect the connectors to the occupant detection ECU and front seat inner belt assembly RH. Connect the cable to the negative (-) battery terminal. Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665567-S03038647982014102400000) Body Electrical > Occupant Detection > Clear DTCs Clear the DTCs stored in the airbag sensor assembly. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665792-S03803756002014102400000) Body Electrical > SRS Airbag > Clear DTCs Turn the engine switch off. Turn the engine switch on (IG), and wait for at least 10 seconds. Check for DTCs. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665567-S03038647982014102400000) Body Electrical > Occupant Detection > Trouble Codes OK DTC B1771 is not output. HINT: Codes other than DTC B1771 may be output at this time, but they are not related to this check. Turn the engine switch off. Result Proceed to OK NG Result: 1 OK USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665529-S21853141262014102400000) Result: 2 NG See step 7
  7. CHECK FRONT SEAT INNER BELT ASSEMBLY RH Disconnect the cable from the negative (-) battery terminal. Replace the front seat inner belt assembly RH with a known good one. Refer to «REMOVAL [04/2013 - ]»(ref-665531-S10627930282014102400000) HINT: Perform the following inspection using known good parts from another vehicle if possible. Connect the cable to the negative (-) battery terminal. Clear the DTCs stored in the occupant detection ECU. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665567-S03038647982014102400000) Body Electrical > Occupant Detection > Clear DTCs Clear the DTCs stored in the airbag sensor assembly. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665792-S03803756002014102400000) Body Electrical > SRS Airbag > Clear DTCs Turn the engine switch off. Turn the engine switch on (IG), and wait for at least 10 seconds. Check for DTCs. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665567-S03038647982014102400000) Body Electrical > Occupant Detection > Trouble Codes OK DTC B1771 is not output. HINT: Codes other than DTC B1771 may be output at this time, but they are not related to this check. Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal. Restore the front seat inner belt assembly RH that was installed for testing to its original location. Refer to «REMOVAL [04/2013 - ]»(ref-665531-S10627930282014102400000) Result Proceed to OK NG Result: 1 OK REPLACE FRONT SEAT INNER BELT ASSEMBLY RH. Refer to «REMOVAL [04/2013 - ]»(ref-665531-S10627930282014102400000) Result: 2 NG See step 8
  8. REPLACE OCCUPANT DETECTION ECU Disconnect the cable from the negative (-) battery terminal. Replace the occupant detection ECU with a new one. Refer to «REMOVAL [04/2013 - ]»(ref-665530-S23053807092014102400000) Connect the cable to the negative (-) battery terminal. Result Proceed to NEXT Result: 1 NEXT See step 9
  9. PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK Using the Techstream, perform Zero Point Calibration and Sensitivity Check. Refer to «INITIALIZATION [04/2013 - ]»(ref-665567-S31448154542014102400000) Body Electrical > Occupant Detection > Utility Tester Display Zero Point Calibration & Sensitivity Check Result Proceed to NEXT Result: 1 NEXT END

Note. After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work. Refer to PRECAUTION [04/2013 - ]

  1. CHECK SRS WARNING LIGHT Turn the engine switch on (IG), and check the SRS warning light condition. HINT: If a passenger airbag ON/OFF indicator malfunction occurs, the SRS warning light does not illuminate. If the light comes on, a DTC is stored. Troubleshoot the DTC. OK After the primary check period, the SRS warning light goes off. HINT: The primary check is performed for approximately 6 seconds after the engine switch is turned on (IG). Result Proceed to OK NG Result: 2 NG GO TO AIRBAG SYSTEM. Refer to «DIAGNOSTIC TROUBLE CODE CHART [04/2013 - ]»(ref-665792-S06886873772014102400000) Result: 1 OK See step 2
  2. PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK Using the Techstream, perform Zero Point Calibration and Sensitivity Check. Refer to «INITIALIZATION [04/2013 - ]»(ref-665567-S31448154542014102400000) Body Electrical > Occupant Detection > Utility Tester Display Zero Point Calibration & Sensitivity Check OK "Zero Point Calibration is complete." and "Sensitivity Check is complete." are displayed. Result Proceed to OK NG Result: 1 OK END Result: 2 NG See step 3
  3. RETIGHTEN FRONT SEAT ASSEMBLY RH BOLT Loosen the 4 installation bolts of the front seat assembly RH. Tighten the 4 installation bolts of the front seat assembly RH to the specified torque. Refer to «INSTALLATION [04/2013 - ]»(ref-665743-S36391795312014102400000) Result Proceed to NEXT Result: 1 NEXT See step 4
  4. PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK Using the Techstream, perform Zero Point Calibration and Sensitivity Check. Refer to «INITIALIZATION [04/2013 - ]»(ref-665567-S31448154542014102400000) Body Electrical > Occupant Detection > Utility Tester Display Zero Point Calibration & Sensitivity Check OK "Zero Point Calibration is complete." and "Sensitivity Check is complete." are displayed. Result Proceed to OK NG Result: 1 OK END Result: 2 NG See step 5
  5. READ VALUE USING TECHSTREAM Using the Techstream, read the Data List. Refer to «DATA LIST / ACTIVE TEST [04/2013 - ]»(ref-665567-S14506231222014102400000) Body Electrical > Occupant Detection > Data List Tester Display Passenger Buckle SW Read the display when the passenger side buckle switch is operated. Body Electrical > Occupant Detection > Data List Tester Display Measurement Item Range Normal Condition Diagnostic Note Passenger Buckle SW Passenger side buckle switch Set: The seat belt is fastened Unset: The seat belt is not fastened NG: Data is not determined Set/Unset - OK The Techstream display changes correctly in accordance with the operation of the buckle switch. Result Proceed to OK NG Result: 2 NG See step 9 Result: 1 OK See step 6
  6. CHECK CONNECTORS Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal. Disconnect the connectors from the occupant detection ECU, front occupant classification sensor LH and rear occupant classification sensor LH. Check that the terminals of the connectors are not damaged. OK The terminals are not deformed or damaged. Result Proceed to OK NG Result: 2 NG REPLACE FRONT SEAT WIRE RH Result: 1 OK See step 7
  7. REPLACE OCCUPANT DETECTION ECU Connect the connectors to the front occupant classification sensor LH and rear occupant classification sensor LH. Replace the occupant detection ECU. Refer to «REMOVAL [04/2013 - ]»(ref-665530-S23053807092014102400000) Connect the cable to the negative (-) battery terminal. Result Proceed to NEXT Result: 1 NEXT See step 8
  8. PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK Using the Techstream, perform Zero Point Calibration and Sensitivity Check. Refer to «INITIALIZATION [04/2013 - ]»(ref-665567-S31448154542014102400000) Body Electrical > Occupant Detection > Utility Tester Display Zero Point Calibration & Sensitivity Check Result Proceed to NEXT Result: 1 NEXT END
  9. CHECK CONNECTORS Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal. Disconnect the connectors from the occupant detection ECU and front seat inner belt assembly RH. Check that the terminals of the connectors are not damaged. OK The terminals are not deformed or damaged. Result Proceed to OK NG Result: 2 NG REPLACE FRONT SEAT WIRE RH Result: 1 OK See step 10
  10. REPLACE FRONT SEAT INNER BELT ASSEMBLY RH Connect the connector to the occupant detection ECU. Replace the front seat inner belt assembly RH. Refer to «REMOVAL [04/2013 - ]»(ref-665531-S10627930282014102400000) Connect the cable to the negative (-) battery terminal. Result Proceed to NEXT Result: 1 NEXT See step 11
  11. PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK Using the Techstream, perform Zero Point Calibration and Sensitivity Check. Refer to «INITIALIZATION [04/2013 - ]»(ref-665567-S31448154542014102400000) Body Electrical > Occupant Detection > Utility Tester Display Zero Point Calibration & Sensitivity Check Result Proceed to NEXT Result: 1 NEXT END

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