Toyota RAV4 (XA40) 2013-2018 Service Manual: Rear occupant classification sensor lh circuit malfunction
![Toyota RAV4. Rear occupant classification sensor lh circuit malfunction](images/books/256/68/4.htm56.jpg)
Description
The rear occupant classification sensor lh circuit consists of the occupant
classification ecu and the rear
occupant classification sensor lh.
Dtc b1782 is recorded when a malfunction is detected in the rear occupant
classification sensor lh
circuit.
![Toyota RAV4. Rear occupant classification sensor lh circuit malfunction](images/books/256/68/4.htm57.jpg)
Wiring diagram
![Toyota RAV4. Rear occupant classification sensor lh circuit malfunction](images/books/256/68/4.htm58.jpg)
Inspection procedure
Hint:
- If troubleshooting (wire harness inspection) is difficult to perform,
remove the front passenger seat
installation bolts to see the undersurface of the seat cushion.
- In the above case, hold the seat so that it does not tip over. Holding
the seat for a long period of time
may cause a problem, such as seat rail deformation. Hold the seat up only
for as long as necessary.
- Check for dtc
- Turn the ignition switch on.
- Clear the dtcs (see page rs-249).
Hint:
First clear dtcs stored in the occupant classification
ecu and then in the center airbag sensor.
- Turn the ignition switch off.
- Turn the ignition switch on.
- Check the dtcs (see page rs-249).
Ok:
dtc b1782 is not output.
Hint:
Dtcs other than dtc b1782 may be output at this time,
but they are not related to this check.
![](images/books/256/68/4.htm60.gif)
- Check connection of connector
- Turn the ignition switch off.
- Disconnect the cable from the negative (-) battery
terminal, and wait for at least 90 seconds.
- Check that the connectors are properly connected to the
occupant classification ecu and the rear occupant
classification sensor lh.
Ok:
the connectors are properly connected.
![](images/books/256/68/4.htm62.gif)
- Check front seat wire rh (to b+)
![Toyota RAV4. Check front seat wire rh (to b+)](images/books/256/68/4.htm63.jpg)
- Disconnect the connectors from the occupant
classification ecu and the rear occupant classification
sensor lh.
- Connect the cable to the negative (-) battery terminal,
and wait for at least 2 seconds.
- Turn the ignition switch on.
- Measure the voltage of the wire harness side connector.
Standard voltage ![](images/books/256/68/4.htm64.jpg)
![](images/books/256/68/4.htm66.gif)
- Check front seat wire rh (for open)
![Toyota RAV4. Check front seat wire rh (for open)](images/books/256/68/4.htm67.jpg)
- Turn the ignition switch off.
- Disconnect the cable from the negative (-) battery
terminal, and wait for at least 90 seconds.
- Using a service wire, connect terminals a3-1 (svc3) and
a3-3 (sgd3), and connect terminals a3-2 (sig3) and a3-
3 (sgd3) of connector c.
Notice:
Do not forcibly insert a service wire into the
terminals of the connector when connecting them.
- Measure the resistance of the wire harness side
connector.
Standard resistance ![](images/books/256/68/4.htm68.jpg)
![](images/books/256/68/4.htm70.gif)
- Check front seat wire rh (for short)
![Toyota RAV4. Check front seat wire rh (for short)](images/books/256/68/4.htm71.jpg)
- Disconnect the service wire from connector c.
- Measure the resistance of the wire harness side
connector.
Standard resistance
![](images/books/256/68/4.htm74.gif)
- Check front seat wire rh (to ground)
![Toyota RAV4. Check front seat wire rh (to ground)](images/books/256/68/4.htm75.jpg)
- Measure the resistance of the wire harness side
connector.
Standard resistance ![](images/books/256/68/4.htm76.jpg)
![](images/books/256/68/4.htm78.gif)
- Check for dtc
- Connect the connectors to the occupant classification
ecu and the rear occupant classification sensor lh.
- Connect the cable to the negative (-) battery terminal,
and wait for at least 2 seconds.
- Turn the ignition switch on.
- Clear the dtcs (see page rs-249).
Hint:
First clear dtcs stored in the occupant classification
ecu and then in the center airbag sensor.
- Turn the ignition switch off.
- Turn the ignition switch on.
- Check the dtcs (see page rs-249).
Ok:
dtc b1782 is not output.
Hint:
Dtcs other than dtc b1782 may be output at this time,
but they are not related to this check.
- Replace occupant classification ecu
- Turn the ignition switch off.
- Disconnect the cable from the negative (-) battery
terminal, and wait for at least 90 seconds.
- Replace the occupant classification ecu (see page rs-
392).
Hint:
Perform the inspection using parts from a normal vehicle
if possible.
![](images/books/256/68/4.htm81.gif)
- Perform zero point calibration
- Connect the cable to the negative (-) battery terminal,
and wait for at least 2 seconds.
- Connect the intelligent tester to the dlc3.
- Turn the ignition switch on.
- Using the intelligent tester, perform the zero point
calibration (see page rs-241).
Ok:
completed is displayed.
![](images/books/256/68/4.htm83.gif)
- Perform sensitivity check
- Using the intelligent tester, perform the sensitivity check
(see page rs-241).
Standard value:
27 to 33 kg (59.52 To 72.75 Lb)
![](images/books/256/68/4.htm85.gif)
- Check for dtc
- Connect the cable to the negative (-) battery terminal,
and wait for at least 2 seconds.
- Turn the ignition switch on.
- Clear the dtcs (see page rs-249).
Hint:
First clear dtcs stored in the occupant classification
ecu and then in the center airbag sensor.
- Turn the ignition switch off.
- Turn the ignition switch on.
- Check the dtcs (see page rs-249).
Ok:
dtc b1782 is not output.
Hint:
Dtcs other than dtc b1782 may be output at this time,
but they are not related to this check.
![](images/books/256/68/4.htm87.gif)
- Replace front seat assembly rh
- Turn the ignition switch off.
- Disconnect the cable from the negative (-) battery
terminal, and wait for at least 90 seconds.
- Replace the front seat assembly rh (see page se-8).
- Perform zero point calibration
- Connect the negative (-) terminal cable to the battery,
and wait for at least 2 seconds.
- Connect the intelligent tester to the dlc3.
- Turn the ignition switch on.
- Using the intelligent tester, perform the zero point
calibration (see page rs-241).
Ok:
completed is displayed.
- Perform sensitivity check
- Using the intelligent tester, perform the sensitivity check
(see page rs-241).
Standard value:
27 to 33 kg (59.52 To 72.75 Lb)
![](images/books/256/68/4.htm90.gif)
End
Description
The front occupant classification sensor rh circuit consists of the occupant
classification ecu and the
front occupant classification sensor rh.
Dtc b1781 is recorded when a mal ...
Description
The rear occupant classification sensor rh circuit consists of the occupant
classification ecu and the
rear occupant classification sensor rh.
Dtc b1783 is recorded when a malf ...
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