B1787

SUPPLEMENTAL RESTRAINT SYSTEMS: OCCUPANT CLASSIFICATION SYSTEM: B1787: Rear Occupant Classification Sensor LH Collision Detection
B1787 - Rear Occupant Classification Sensor LH Collision Detection

DESCRIPTION

DTC B1787 is stored when the occupant detection ECU receives a collision detection signal sent by the rear occupant classification sensor LH if an accident occurs.

DTC B1787 is also stored when the front seat assembly RH is subjected to a strong impact, even if an actual accident does not occur.

If the vehicle is not in a collision, but the occupant detection ECU outputs a collision detection signal and sets DTC B1787, the DTC can be cleared by performing Zero Point Calibration and Sensitivity Check.

Therefore, if DTC B1787 is output, first perform Zero Point Calibration and Sensitivity Check.





HINT
When DTC B1650/32 is detected 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 the DTC.

WIRING DIAGRAM

Refer to DTC B1782 B1782.

INSPECTION PROCEDURE

NOTICE:
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 Service Precautions.

PROCEDURE

1. PERFORM ZERO POINT CALIBRATION

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Using the Techstream, perform Zero Point Calibration Programming and Relearning.

OK:

"Zero Point Calibration is complete." is displayed.

NG -- REPLACE FRONT SEAT CUSHION SPRING ASSEMBLY
OK -- Continue to next step.

2. CHECK DTC

(a) Turn the power switch on (IG).

(b) Clear the DTCs stored in the occupant detection ECU Reading and Clearing Diagnostic Trouble Codes.

(c) Clear the DTCs stored in the airbag sensor assembly Reading and Clearing Diagnostic Trouble Codes.

(d) Turn the power switch off.

(e) Turn the power switch on (IG).

(f) Check for DTCs Reading and Clearing Diagnostic 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.

NG -- REPLACE FRONT SEAT CUSHION SPRING ASSEMBLY
OK -- Continue to next step.

3. PERFORM SENSITIVITY CHECK

(a) Using the Techstream, perform Sensitivity Check Programming and Relearning.

NEXT -- END

4. REPLACE FRONT SEAT CUSHION SPRING ASSEMBLY

(a) Turn the power switch off.

(b) Disconnect the cable from the negative (-) auxiliary battery terminal.

(c) Replace the front seat cushion spring assembly Disassembly for Manual seat, Disassembly for Power seat).

NEXT -- Continue to next step.

5. PERFORM ZERO POINT CALIBRATION

(a) Connect the cable to the negative (-) auxiliary battery terminal.

(b) Turn the power switch on (IG).

(c) Using the Techstream, perform Zero Point Calibration Programming and Relearning.

NEXT -- Continue to next step.

6. PERFORM SENSITIVITY CHECK

(a) Using the Techstream, perform Sensitivity Check Programming and Relearning.

NEXT -- END