DTC B1782: Rear Occupant Classification Sensor LH Circuit Malfunction [08/2016 - ]: Procedure
- CHECK VEHICLE CONDITION
Result: 2
B
See step 15
Result: 1
A
See step 2
- CHECK CONNECTORS
- Turn the ignition switch off.
- Disconnect the cable from the negative (-) battery terminal.
- Check that the connectors are properly connected to the occupant 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 3
- 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 ignition switch to ON.
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition S1-2 (SVC3) - Body ground Ignition switch ON Below 1 V S1-4 (SIG3) - Body ground Ignition switch ON Below 1 V S1-6 (SGD3) - Body ground Ignition switch ON Below 1 V - Turn the ignition switch off.
- Disconnect the cable from the negative (-) battery terminal.
Result
Proceed to OK NG
Result: 2
NG
See step 13
Result: 1
OK
See step 4
- Connect the cable to the negative (-) battery terminal.
- 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 S1-2 (SVC3) - S1-6 (SGD3) Always Below 1 Ω S1-4 (SIG3) - S1-6 (SGD3) Always Below 1 Ω - 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 5
- Using a service wire, connect terminals 1 (SVC) and 3 (SGD), and connect terminals 2 (SIG) and 3 (SGD) of connector C.
- 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 S1-2 (SVC3) - S1-6 (SGD3) Always 1 MΩ or higher S1-4 (SIG3) - S1-6 (SGD3) Always 1 MΩ or higher S1-2 (SVC3) - S1-4 (SIG3) Always 1 MΩ or higher Result
Proceed to OK NG
Result: 2
NG
REPLACE FRONT SEAT WIRE RH
Result: 1
OK
See step 6
- Measure the resistance according to the value(s) in the table below.
- 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 S1-2 (SVC3) - Body ground Always 1 MΩ or higher S1-4 (SIG3) - Body ground Always 1 MΩ or higher S1-6 (SGD3) - Body ground Always 1 MΩ or higher Result
Proceed to OK NG
Result: 2
NG
REPLACE FRONT SEAT WIRE RH
Result: 1
OK
See step 7
- Measure the resistance according to value(s) in the table below.
- 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 [08/2013 - ]
Body Electrical > Occupant Detection > Clear DTCs
- Clear the DTCs stored in the airbag sensor assembly.
Refer to DTC CHECK / CLEAR [08/2013 - ]
Body Electrical > SRS Airbag > Clear DTCs
- Turn the ignition switch off.
- Turn the ignition switch to ON, and wait for at least 10 seconds.
- Check for DTCs.
Refer to DTC CHECK / CLEAR [08/2013 - ]
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 ignition switch off.
Result
Proceed to OK NG
Result: 1
OK
USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2016 - 08/2017] Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2017 - ]
Result: 2
NG
See step 8
- 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 [08/2013 - ]
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 [08/2013 - ]
Body Electrical > Occupant Detection > Clear DTCs
- Clear the DTCs stored in the airbag sensor assembly.
Refer to DTC CHECK / CLEAR [08/2013 - ]
Body Electrical > SRS Airbag > Clear DTCs
- Turn the ignition switch off.
- Turn the ignition switch to ON, and wait for at least 10 seconds.
- Check for DTCs.
Refer to DTC CHECK / CLEAR [08/2013 - ]
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 ignition 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 [08/2013 - ]
Result
Proceed to OK NG
Result: 2
NG
See step 11
Result: 1
OK
See step 9
- REPLACE OCCUPANT DETECTION ECU
- Turn the ignition switch off.
- Disconnect the cable from the negative (-) battery terminal.
- Replace the occupant detection ECU with a new one.
Refer to REMOVAL [08/2013 - ]
- Connect the cable to the negative (-) battery terminal.
Result
Proceed to NEXT
Result: 1
NEXT
See step 10
- PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK
- Using the Techstream, perform Zero Point Calibration and Sensitivity Check.
Refer to INITIALIZATION [08/2016 - ]
Body Electrical > Occupant Detection > Utility
Tester Display Zero Point Calibration & Sensitivity Check Result
Proceed to NEXT
Result: 1
NEXT
END
- Using the Techstream, perform Zero Point Calibration and Sensitivity Check.
- REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY RH
- Turn the ignition switch off.
- Disconnect the cable from the negative (-) battery terminal.
- Replace the separate type front seat cushion spring assembly RH.
Refer to REMOVAL [04/2014 - 08/2017] Refer to REMOVAL [08/2017 - ]
- Connect the cable to the negative (-) battery terminal.
Result
Proceed to NEXT
Result: 1
NEXT
See step 12
- PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK
- Using the Techstream, perform Zero Point Calibration and Sensitivity Check.
Refer to INITIALIZATION [08/2016 - ]
Body Electrical > Occupant Detection > Utility
Tester Display Zero Point Calibration & Sensitivity Check Result
Proceed to NEXT
Result: 1
NEXT
END
- Using the Techstream, perform Zero Point Calibration and Sensitivity Check.
- REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY RH AND FRONT SEAT WIRE RH
- Replace the separate type front seat cushion spring assembly RH and front seat wire RH.
Refer to REMOVAL [04/2014 - 08/2017] Refer to REMOVAL [08/2017 - ]
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 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 14
- Replace the separate type front seat cushion spring assembly RH and front seat wire RH.
- PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK
- Using the Techstream, perform Zero Point Calibration and Sensitivity Check.
Refer to INITIALIZATION [08/2016 - ]
Body Electrical > Occupant Detection > Utility
Tester Display Zero Point Calibration & Sensitivity Check Result
Proceed to NEXT
Result: 1
NEXT
END
- Using the Techstream, perform Zero Point Calibration and Sensitivity Check.
- CHECK CONNECTORS
- Turn the ignition switch off.
- Disconnect the cable from the negative (-) battery terminal.
- Check that the connectors are properly connected to the occupant detection ECU, front seat inner belt assembly RH 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, front seat inner belt assembly RH 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 WIRE HARNESS
Result: 1
OK
See step 16
- CHECK WIRE HARNESS (SHORT TO B+)
- Connect the connector to the front seat inner belt assembly RH.
*1 Rear Occupant Classification Sensor LH *2 Occupant Detection ECU *a Front view of wire harness connector
(to Occupant Detection ECU) - Connect the cable to the negative (-) battery terminal.
- Turn the ignition switch to ON.
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition S7-2 (SVC3) - Body ground Ignition switch ON Below 1 V S7-4 (SIG3) - Body ground Ignition switch ON Below 1 V S7-6 (SGD3) - Body ground Ignition switch ON Below 1 V - Turn the ignition switch off.
- Disconnect the cable from the negative (-) battery terminal.
Result
Proceed to OK NG
Result: 2
NG
See step 29
Result: 1
OK
See step 17
- Connect the connector to the front seat inner belt assembly RH.
- CHECK WIRE HARNESS (OPEN)
- Using a service wire, connect terminals 1 (SVC) and 3 (SGD), and connect terminals 2 (SIG) and 3 (SGD) of connector E.
*1 Rear Occupant Classification Sensor LH *2 Occupant Detection ECU *3 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)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 S7-2 (SVC3) - S7-6 (SGD3) Always Below 1 Ω S7-4 (SIG3) - S7-6 (SGD3) Always Below 1 Ω Result
Proceed to OK NG
Result: 2
NG
See step 28
Result: 1
OK
See step 18
- Using a service wire, connect terminals 1 (SVC) and 3 (SGD), and connect terminals 2 (SIG) and 3 (SGD) of connector E.
- CHECK WIRE HARNESS (SHORT)
- Disconnect the service wire from connector E.
*1 Rear Occupant Classification Sensor LH *2 Occupant Detection ECU *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 S7-2 (SVC3) - S7-6 (SGD3) Always 1 MΩ or higher S7-4 (SIG3) - S7-6 (SGD3) Always 1 MΩ or higher S7-2 (SVC3) - S7-4 (SIG3) Always 1 MΩ or higher Result
Proceed to OK NG
Result: 2
NG
See step 27
Result: 1
OK
See step 19
- Disconnect the service wire from connector E.
- CHECK WIRE HARNESS (SHORT TO GROUND)
- Measure the resistance according to value(s) in the table below.
*1 Rear Occupant Classification Sensor LH *2 Occupant Detection ECU *a Front view of wire harness connector
(to Occupant Detection ECU)Standard Resistance
Tester Connection Condition Specified Condition S7-2 (SVC3) - Body ground Always 1 MΩ or higher S7-4 (SIG3) - Body ground Always 1 MΩ or higher S7-6 (SGD3) - Body ground Always 1 MΩ or higher Result
Proceed to OK NG
Result: 2
NG
See step 26
Result: 1
OK
See step 20
- Measure the resistance according to value(s) in the table below.
- 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 [08/2013 - ]
Body Electrical > Occupant Detection > Clear DTCs
- Clear the DTCs stored in the airbag sensor assembly.
Refer to DTC CHECK / CLEAR [08/2013 - ]
Body Electrical > SRS Airbag > Clear DTCs
- Turn the ignition switch off.
- Turn the ignition switch to ON, and wait for at least 10 seconds.
- Check for DTCs.
Refer to DTC CHECK / CLEAR [08/2013 - ]
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 ignition switch off.
Result
Proceed to OK NG
Result: 1
OK
USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2016 - 08/2017] Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2017 - ]
Result: 2
NG
See step 21
- 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 [08/2013 - ]
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 [08/2013 - ]
Body Electrical > Occupant Detection > Clear DTCs
- Clear the DTCs stored in the airbag sensor assembly.
Refer to DTC CHECK / CLEAR [08/2013 - ]
Body Electrical > SRS Airbag > Clear DTCs
- Turn the ignition switch off.
- Turn the ignition switch to ON, and wait for at least 10 seconds.
- Check for DTCs.
Refer to DTC CHECK / CLEAR [08/2013 - ]
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 ignition 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 [08/2013 - ]
Result
Proceed to OK NG
Result: 2
NG
See step 24
Result: 1
OK
See step 22
- REPLACE OCCUPANT DETECTION ECU
- Turn the ignition switch off.
- Disconnect the cable from the negative (-) battery terminal.
- Replace the occupant detection ECU with a new one.
Refer to REMOVAL [08/2013 - ]
- Connect the cable to the negative (-) battery terminal.
Result
Proceed to NEXT
Result: 1
NEXT
See step 23
- PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK
- Using the Techstream, perform Zero Point Calibration and Sensitivity Check.
Refer to INITIALIZATION [08/2016 - ]
Body Electrical > Occupant Detection > Utility
Tester Display Zero Point Calibration & Sensitivity Check Result
Proceed to NEXT
Result: 1
NEXT
END
- Using the Techstream, perform Zero Point Calibration and Sensitivity Check.
- REPLACE FRONT SEAT ADJUSTER SUB-ASSEMBLY RH
- Turn the ignition switch off.
- Disconnect the cable from the negative (-) battery terminal.
- Replace the front seat adjuster sub-assembly RH.
Refer to REMOVAL [08/2013 - ]
- Connect the cable to the negative (-) battery terminal.
Result
Proceed to NEXT
Result: 1
NEXT
See step 25
- PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK
- Using the Techstream, perform Zero Point Calibration and Sensitivity Check.
Refer to INITIALIZATION [08/2016 - ]
Body Electrical > Occupant Detection > Utility
Tester Display Zero Point Calibration & Sensitivity Check Result
Proceed to NEXT
Result: 1
NEXT
END
- Using the Techstream, perform Zero Point Calibration and Sensitivity Check.
- CHECK FRONT SEAT INNER BELT ASSEMBLY RH (SHORT TO GROUND)
- Disconnect the connector from the front seat inner belt assembly RH.
*1 Rear Occupant Classification Sensor LH *2 Occupant Detection ECU *3 Front Seat Inner Belt Assembly RH *4 Front Seat Wire RH *a Front view of wire harness connector
(to Front Seat Wire RH) - Measure the resistance according to value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition 6 - Body ground Always 1 MΩ or higher 7 - Body ground Always 1 MΩ or higher 8 - Body ground Always 1 MΩ or higher Result
Proceed to OK NG
Result: 1
OK
REPLACE FRONT SEAT WIRE RH
Result: 2
NG
REPLACE FRONT SEAT INNER BELT ASSEMBLY RH. Refer to REMOVAL [08/2016 - 08/2017] Refer to REMOVAL [08/2017 - ]
- Disconnect the connector from the front seat inner belt assembly RH.
- CHECK FRONT SEAT INNER BELT ASSEMBLY RH (SHORT)
- Disconnect the connector from the front seat inner belt assembly RH.
*1 Rear Occupant Classification Sensor LH *2 Occupant Detection ECU *3 Front Seat Inner Belt Assembly RH *4 Front Seat Wire RH *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 6 - 8 Always 1 MΩ or higher 7 - 8 Always 1 MΩ or higher 6 - 7 Always 1 MΩ or higher Result
Proceed to OK NG
Result: 1
OK
REPLACE FRONT SEAT WIRE RH
Result: 2
NG
REPLACE FRONT SEAT INNER BELT ASSEMBLY RH. Refer to REMOVAL [08/2016 - 08/2017] Refer to REMOVAL [08/2017 - ]
- Disconnect the connector from the front seat inner belt assembly RH.
- CHECK FRONT SEAT INNER BELT ASSEMBLY RH (OPEN)
- Disconnect the connector from the front seat inner belt assembly RH.
*1 Rear Occupant Classification Sensor LH *2 Occupant Detection ECU *3 Front Seat Inner Belt Assembly RH *4 Front Seat Wire RH *5 Service Wire *a Front view of wire harness connector
(to Front Seat Wire RH)*b Front view of wire harness connector
(to Rear Occupant Classification Sensor LH)HINT:
The service wire has already been inserted into connector E.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition 6 - 8 Always Below 1 Ω 7 - 8 Always Below 1 Ω - Disconnect the service wire from connector E.
Result
Proceed to OK NG
Result: 1
OK
REPLACE FRONT SEAT WIRE RH
Result: 2
NG
REPLACE FRONT SEAT INNER BELT ASSEMBLY RH. Refer to REMOVAL [08/2016 - 08/2017] Refer to REMOVAL [08/2017 - ]
- Disconnect the connector from the front seat inner belt assembly RH.
- CHECK FRONT SEAT INNER BELT ASSEMBLY RH (SHORT TO B+)
- Disconnect the connector from the front seat inner belt assembly RH.
*1 Rear Occupant Classification Sensor LH *2 Occupant Detection ECU *3 Front Seat Inner Belt Assembly RH *4 Front Seat Wire RH *a Front view of wire harness connector
(to Front Seat Wire RH) - Connect the cable to the negative (-) battery terminal.
- Turn the ignition switch to ON.
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition 6 - Body ground Ignition switch ON Below 1 V 7 - Body ground Ignition switch ON Below 1 V 8 - Body ground Ignition switch ON Below 1 V - Turn the ignition switch off.
- Disconnect the cable from the negative (-) battery terminal.
Result
Proceed to OK NG
Result: 2
NG
See step 32
Result: 1
OK
See step 30
- Disconnect the connector from the front seat inner belt assembly RH.
- REPLACE FRONT SEAT ADJUSTER SUB-ASSEMBLY RH AND FRONT SEAT WIRE RH
- Replace the front seat adjuster sub-assembly RH and front seat wire RH.
Refer to REMOVAL [08/2013 - ]
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 front seat adjuster sub-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 31
- Replace the front seat adjuster sub-assembly RH and front seat wire RH.
- PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK
- Using the Techstream, perform Zero Point Calibration and Sensitivity Check.
Refer to INITIALIZATION [08/2016 - ]
Body Electrical > Occupant Detection > Utility
Tester Display Zero Point Calibration & Sensitivity Check Result
Proceed to NEXT
Result: 1
NEXT
END
- Using the Techstream, perform Zero Point Calibration and Sensitivity Check.
- REPLACE FRONT SEAT ADJUSTER SUB-ASSEMBLY RH AND FRONT SEAT INNER BELT ASSEMBLY RH
- Replace the front seat adjuster sub-assembly RH and front seat inner belt assembly RH.
Refer to REMOVAL [08/2013 - ]
HINT:
When the front seat inner belt assembly RH has a short to B+, the rear occupant classification sensor LH will be damaged. Therefore, replace the front seat inner belt assembly RH and front seat adjuster sub-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 33
- Replace the front seat adjuster sub-assembly RH and front seat inner belt assembly RH.
- PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK
- Using the Techstream, perform Zero Point Calibration and Sensitivity Check.
Refer to INITIALIZATION [08/2016 - ]
Body Electrical > Occupant Detection > Utility
Tester Display Zero Point Calibration & Sensitivity Check Result
Proceed to NEXT
Result: 1
NEXT
END
- Using the Techstream, perform Zero Point Calibration and Sensitivity Check.