Toyota RAV4 Service Manual: Open in occupant classification ecu battery positive line

Description
Dtc b1794 is set when a malfunction is detected in the occupant
classification ecu battery positive line.

Wiring diagram

Inspection procedure
- 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, and wait for at least 10
seconds.
- Turn the ignition switch on.
- Check the dtcs (see page rs-249).
Ok:
dtc b1794 is not output.
Hint:
Dtcs other than b1794 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.
Ok:
the connectors are properly connected.

- Check wire harness (source voltage)

- Turn the ignition switch off.
- Disconnect the cable from the negative (-) battery
terminal, and wait for at least 90 seconds.
- Disconnect the l1 connector from the occupant
classification ecu.
- Connect the cable to the negative (-) battery terminal,
and wait for at least 2 seconds.
- Measure the voltage of the wire harness side connector.
Standard voltage 
- Measure the resistance of the wire harness side
connector.
Standard resistance 

- Check for dtc
- Turn the ignition switch off.
- Disconnect the cable from the negative (-) battery
terminal, and wait for at least 90 seconds.
- Connect the connectors to the occupant classification
ecu.
- 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, and wait for at least 10
seconds.
- Turn the ignition switch on.
- Using the intelligent tester, check for dtcs of the
occupant classification ecu (see page rs-249).
Ok:
dtc b1794 is not output.
Hint:
Dtcs other than b1794 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
when possible.
- Perform zero point calibration
- Connect the cable to the negative (-) battery terminal,
and wait for at least 2 seconds.
- Connect the intelligent tester (with can vim) 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
The occupant classification sensor power supply circuit consists of the
occupant classification ecu and
the occupant classification sensors.
Dtc b1793 is recorded when a malfunc ...
Description
Dtc b1795 is recorded when a malfunction is detected in the occupant
classification ecu.
Troubleshoot dtc b1771 first when dtc b1771 and b1795 are output simultaneously.
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