Toyota Venza manuals

Toyota Venza: Rear Occupant Classification Sensor LH Collision Detection (B1787)

Toyota Venza Service Manual / Supplemental Restraint Systems / Occupant Classification System / Rear Occupant Classification Sensor LH Collision Detection (B1787)

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.

DTC No.

DTC Detection Condition

Trouble Area

B1787

  • Front seat assembly RH malfunction
  • Occupant classification ECU malfunction
  • Rear occupant classification sensor LH sensed large load
  • Front seat frame with adjuster assembly RH (Rear occupant classification sensor LH)
  • Occupant classification ECU

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


PROCEDURE

1.

PERFORM ZERO POINT CALIBRATION

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Using the Techstream, perform Zero Point Calibration (See page ).


OK:

"Zero Point Calibration is complete." is displayed.


NG

GO TO STEP 4


OK

2.

PERFORM SENSITIVITY CHECK

(a) Using the Techstream, perform Sensitivity Check (See page ).


Standard:

27 to 33 kg (59.5 to 72.8 lb)


NG

GO TO STEP 4


OK

3.

CHECK DTC

(a) Turn the ignition switch to ON.

(b) Clear the DTCs stored in the occupant classification ECU (See page ).


(c) Clear the DTCs stored in the center airbag sensor assembly (See page ).


(d) Turn the ignition switch off.

(e) Turn the ignition switch to ON.

(f) Check for DTCs (See page ).


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

4.

REPLACE FRONT SEAT FRAME WITH ADJUSTER ASSEMBLY RH

(a) Turn the ignition switch off.

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

(c) Replace the front seat frame with adjuster assembly RH (See page for power seat or
for manual seat).


HINT:

Perform the inspection using parts from a normal vehicle if possible.


NEXT

5.

PERFORM ZERO POINT CALIBRATION

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

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Using the Techstream, perform Zero Point Calibration (See page ).


OK:

"Zero Point Calibration is complete." is displayed.


NG

GO TO STEP 8


OK

6.

PERFORM SENSITIVITY CHECK

(a) Using the Techstream, perform Sensitivity Check (See page ).


Standard:

27 to 33 kg (59.5 to 72.8 lb)


NG

GO TO STEP 8


OK

7.

CHECK DTC

(a) Turn the ignition switch to ON.

(b) Clear the DTCs stored in the occupant classification ECU (See page ).


(c) Clear the DTCs stored in the center airbag sensor assembly (See page ).


(d) Turn the ignition switch off.

(e) Turn the ignition switch to ON.

(f) Check for DTCs (See page ).


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

8.

REPLACE OCCUPANT CLASSIFICATION ECU

(a) Turn the ignition switch off.

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

(c) Replace the occupant classification ECU (See page ).



NEXT

9.

PERFORM ZERO POINT CALIBRATION

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

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Using the Techstream, perform Zero Point Calibration (See page ).


OK:

"Zero Point Calibration is complete." is displayed.


NEXT

10.

PERFORM SENSITIVITY CHECK

(a) Using the Techstream, perform Sensitivity Check (See page ).


Standard:

27 to 33 kg (59.5 to 72.8 lb)


NEXT

END

Center Airbag Sensor Assembly Communication Circuit Malfunction (B1790)
DESCRIPTION The center airbag sensor assembly communication circuit consists of the occupant classification ECU and center airbag sensor assembly. DTC B1790 is recorded when a malfunction is detec ...

Rear Occupant Classification Sensor RH Collision Detection (B1788)
DESCRIPTION DTC B1788 is output when the occupant classification ECU receives a collision detection signal sent by the rear occupant classification sensor RH if an accident occurs. DTC B1788 is ...

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