Toyota RAV4 manuals

Toyota RAV4 (XA40) 2013-2018 Service Manual: Rear occupant classification sensor lh collision detection

Toyota RAV4 (XA40) 2013-2018 Service Manual / Supplemental restraint system / Occupant classification system / Diagnostic trouble code chart / 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 when 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 performing the zero point calibration and sensitivity check.

Therefore, when dtc b1787 is output, first perform the zero point calibration and sensitivity check.

Toyota RAV4. Rear occupant classification sensor lh collision detection


Wiring diagram

Toyota RAV4. Rear occupant classification sensor lh collision detection


Inspection procedure

  1. Perform zero point calibration

  1. Connect the intelligent tester to the dlc3.
  2. Turn the ignition switch on.
  3. Using the intelligent tester, perform the zero point calibration (see page rs-241).

Ok: completed is displayed.



  1. Perform sensitivity check

  1. Using the intelligent tester, perform the sensitivity check (see page rs-241).

Standard value: 27 to 33 kg (59.52 To 72.75 Lb)


  1. Check for dtc

  1. Turn the ignition switch on.
  2. Clear the dtcs (see page rs-249).

Hint

First clear dtcs stored in the occupant classification ecu and then in the center airbag sensor.

  1. Turn the ignition switch off.
  2. Turn the ignition switch on.
  3. Check the dtcs (see page rs-249).

Ok: dtc b1787 is not output.

Hint:

Dtcs other than dtc b1787 may be output at this time, but they are not related to this check.



  1. Replace front seat assembly rh

  1. Turn the ignition switch off.
  2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
  3. Replace the front seat rh (see page se-27).

Hint:

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


  1. Perform zero point calibration

  1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
  2. Connect the intelligent tester to the dlc3.
  3. Turn the ignition switch on.
  4. Using the intelligent tester, perform the zero point calibration (see page rs-241).

Ok: completed is displayed.



  1. Perform sensitivity check

  1. Using the intelligent tester, perform the sensitivity check (see page rs-241).

Standard value: 27 to 33 kg (59.52 To 72.75 Lb)



  1. Check for dtc

  1. Turn the ignition switch on.
  2. Clear the dtcs (see page rs-249).

Hint:

First clear dtcs stored in the occupant classification ecu and then in the center airbag sensor.

  1. Turn the ignition switch off.
  2. Turn the ignition switch on.
  3. Check the dtcs (see page rs-249).

Ok: dtc b1787 is not output.

Hint:

Dtcs other than dtc b1787 may be output at this time, but they are not related to this check.



  1. Replace occupant classification ecu

  1. Turn the ignition switch off.
  2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
  3. Replace the occupant classification ecu (see page rs- 250).


  1. Perform zero point calibration

  1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
  2. Connect the intelligent tester to the dlc3.
  3. Turn the ignition switch on.
  4. Using the intelligent tester, perform the zero point calibration (see page rs-241).

Ok: completed is displayed.


  1. Perform sensitivity check

  1. Using the intelligent tester, perform the sensitivity check (see page rs-241).

Standard value: 27 to 33 kg (59.52 To 72.75 Lb)


End

Front occupant classification sensor rh collision detection
Description Dtc b1786 is output when the occupant classification ecu receives a collision detection signal sent by the front occupant classification sensor rh when an accident occurs. Dtc b ...

Rear occupant classification sensor rh collision detection
Description Dtc b1788 is output when the occupant classification ecu receives a collision detection signal sent by the rear occupant classification sensor rh when an accident occurs. Dtc b1 ...

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Ecm communication circuit malfunction
Description The circuit is used to send trc and vsc control information from the skid control ecu to the ecm, and engine control information from the ecm to the skid control ecu. Inspection procedure Hint: Check that the part numbers of the installed ecm and skid control ecu are cor ...

Diagnosis system
Description Air conditioning system data and the diagnostic trouble codes (dtcs) can be read through the data link connector 3 (dlc3) of the vehicle. When the system seems to be malfunctioning, use the intelligent tester to check for malfunctions and perform troubleshooting. ...

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