Toyota RAV4 Service Manual: Occupant classification sensor power supply circuit malfunction
Description
The occupant classification sensor power supply circuit consists of the
occupant classification ecu and
the occupant classification sensors.
Dtc b1793 is recorded when a malfunction is detected in the occupant
classification sensor power
supply circuit.
Wiring diagram
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 b1793 is not output.
Hint:
Dtcs other than dtc b1793 may be output at this time,
but they are not related to this check.
- 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 occupant
classification sensors.
Ok:
the connectors are properly connected.
- Check front seat wire rh (to b+)
- Disconnect the connectors from the occupant
classification ecu and the 4 occupant classification
sensors.
- Connect the negative (-) terminal cable to the battery,
and wait for at least 2 seconds.
- Turn the ignition switch on.
- Measure the voltage of the wire harness side connector.
Standard voltage
- Check front seat wire rh (to ground)
- Turn the ignition switch off.
- Disconnect the cable from the negative (-) battery
terminal, and wait for at least 90 seconds.
- Measure the resistance of the wire harness side
connector.
Standard resistance
- Check front seat wire rh (for open)
- Measure the resistance of the wire harness side
connectors.
Standard resistance
- Check front seat wire rh (for short)
- Measure the resistance of the wire harness side
connector.
Standard resistance
- Check for dtc
- Connect the connectors to the occupant classification
ecu and the 4 occupant classification sensors.
- 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 b1793 is not output.
Hint:
Dtcs other than dtc b1793 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.
- 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.
- 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)
- Check for dtc
- Connect the negative (-) terminal cable to the battery,
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 b1793 is not output.
Hint:
Dtcs other than dtc b1793 may be output at this time,
but they are related to this check.
- 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 rh (see page se-8).
- 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.
- 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)
End
Description
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Description
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Wiring diagram
Inspection procedure
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Wiring diagram
Inspection procedure
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