Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC B1787: Rear Occupant Classification Sensor LH Collision Detection [12/2019 - 11/2023]: Procedure
- PERFORM ZERO POINT CALIBRATION
- Using the GTS, perform Zero Point Calibration.
Refer to INITIALIZATION [12/2019 - 10/2021] , or refer to INITIALIZATION [10/2021 - 11/2023]
OK
"Zero Point Calibration is complete." is displayed.
Result
Proceed to OK NG
Result:
NG
See step 5
Result:
OK
See step 2
- Using the GTS, perform Zero Point Calibration.
- CHECK DTC
- Turn the ignition switch to ON, and wait for at least 60 seconds.
- Clear the DTCs stored in the occupant detection ECU.
Body Electrical > Occupant Detection > Clear DTCs
- Clear the DTCs stored in the airbag sensor assembly.
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.
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 ignition switch off.
Result
Proceed to OK NG
Result:
OK
END
Result:
NG
See step 3
- REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY RH
- Turn the ignition switch off.
- Disconnect the cable from the negative (-) auxiliary battery terminal.
- Replace the separate type front seat cushion spring assembly RH.
for Manual Seat: Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]
for Power Seat: Refer to REMOVAL [12/2019 - 10/2021] , or refer to REMOVAL [10/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]
- Connect the cable to the negative (-) auxiliary battery terminal.
Result
Proceed to NEXT
Result:
NEXT
See step 4
- PERFORM ZERO POINT CALIBRATION
- Using the GTS, perform Zero Point Calibration.
Refer to INITIALIZATION [12/2019 - 10/2021] , or refer to INITIALIZATION [10/2021 - 11/2023]
Result
Proceed to NEXT
Result:
NEXT
END
- Using the GTS, perform Zero Point Calibration.
- REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY RH
- Turn the ignition switch off.
- Disconnect the cable from the negative (-) auxiliary battery terminal.
- Replace the separate type front seat cushion spring assembly RH.
for Manual Seat: Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]
for Power Seat: Refer to REMOVAL [12/2019 - 10/2021] , or refer to REMOVAL [10/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]
- Connect the cable to the negative (-) auxiliary battery terminal.
Result
Proceed to NEXT
Result:
NEXT
See step 6
- PERFORM ZERO POINT CALIBRATION
- Using the GTS, perform Zero Point Calibration.
Refer to INITIALIZATION [12/2019 - 10/2021] , or refer to INITIALIZATION [10/2021 - 11/2023]
Result
Proceed to NEXT
Result:
NEXT
END
- Using the GTS, perform Zero Point Calibration.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.