B1787
SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM: B1787: Rear Occupant Classification Sensor LH Collision Detection
B1787 - Rear Occupant Classification Sensor LH Collision Detection
DESCRIPTION
DTC B1787 is output when the occupant classification ECU receives a collision detection signal sent by the rear occupant classification sensor LH if an accident occurs.
DTC B1787 is also output when the front seat assembly RH is subjected to a strong impact, even if an actual accident does not occur.
However, when the occupant classification ECU outputs a collision detection signal, even if the vehicle is not in a collision, DTC B1787 can be cleared by "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 classification ECU. When DTC B1787 is output, perform troubleshooting for the DTC.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. PERFORM ZERO POINT CALIBRATION
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch on (IG).
(c) Using Techstream, perform "zero point calibration" Programming and Relearning.
OK:
"Zero Point Calibration is complete." is displayed.
NG -- REPLACE FRONT SEAT ASSEMBLY RH
OK -- Continue to next step.
2. PERFORM SENSITIVITY CHECK
(a) Using Techstream, perform "sensitivity check" Programming and Relearning.
Standard value:
27 to 33 kg (59.52 to 72.75 lb)
NG -- REPLACE FRONT SEAT ASSEMBLY RH
OK -- Continue to next step.
3. CHECK DTC
(a) Turn the ignition switch on (IG).
(b) Clear the DTCs stored in the occupant classification ECU Reading and Clearing Diagnostic Trouble Codes.
(c) for TMC made:
Clear the DTCs stored in the center airbag sensor assembly Airbag System (for TMC Made).
(d) except TMC made:
Clear the DTCs stored in the center airbag sensor assembly Airbag System (except TMC Made).
(e) Turn the ignition switch off.
(f) Turn the ignition switch on (IG).
(g) Check the 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.
OK -- END
NG -- Continue to next step.
4. REPLACE FRONT SEAT ASSEMBLY RH
(a) Turn the ignition switch off.
(b) Disconnect the negative (-) terminal cable from the battery.
(c) Replace the front seat assembly RH Removal for power seat or Removal for manual seat).
HINT
Perform the inspection using parts from a normal vehicle if possible.
NEXT -- Continue to next step.
5. PERFORM ZERO POINT CALIBRATION
(a) Connect the negative (-) terminal cable to the battery.
(b) Connect Techstream to the DLC3.
(c) Turn the ignition switch on (IG).
(d) Using Techstream, perform "zero point calibration" Programming and Relearning.
OK:
"Zero Point Calibration is complete." is displayed.
NG -- REPLACE OCCUPANT CLASSIFICATION ECU
OK -- Continue to next step.
6. PERFORM SENSITIVITY CHECK
(a) Using Techstream, perform "sensitivity check" Programming and Relearning.
Standard value:
27 to 33 kg (59.52 to 72.75 lb)
NG -- REPLACE OCCUPANT CLASSIFICATION ECU
OK -- Continue to next step.
7. CHECK DTC
(a) Turn the ignition switch on (IG).
(b) Clear the DTCs stored in the occupant classification ECU Reading and Clearing Diagnostic Trouble Codes.
(c) for TMC made:
Clear the DTCs stored in the center airbag sensor assembly Airbag System (for TMC Made).
(d) except TMC made:
Clear the DTCs stored in the center airbag sensor assembly Airbag System (except TMC Made).
(e) Turn the ignition switch off.
(f) Turn the ignition switch on (IG).
(g) Check the 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.
OK -- END
NG -- Continue to next step.
8. REPLACE OCCUPANT CLASSIFICATION ECU
(a) Turn the ignition switch off.
(b) Disconnect the negative (-) terminal cable from the battery.
(c) Replace the occupant classification ECU Removal.
NEXT -- Continue to next step.
9. PERFORM ZERO POINT CALIBRATION
(a) Connect the negative (-) terminal cable to the battery.
(b) Connect Techstream to the DLC3.
(c) Turn the ignition switch on (IG).
(d) Using Techstream, perform "zero point calibration" Programming and Relearning.
OK:
"Zero Point Calibration is complete." is displayed.
NEXT -- Continue to next step.
10. PERFORM SENSITIVITY CHECK
(a) Using Techstream, perform "sensitivity check" Programming and Relearning.
Standard value:
27 to 33 kg (59.52 to 72.75 lb)
NEXT -- END