Toyota RAV4 (XA40) 2013-2018 Service Manual: Occupant classification ecu malfunction
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.
Wiring diagram
Inspection procedure
- Check for dtc
- Turn the ignition switch on, and wait for at least 10 seconds.
- Check the dtcs (see page rs-249).
Result 
Hint:
Dtcs other than dtc b1771 and b1795 may be output at this time, but they are not related to this check.
- Check fuse (ecu-b)
- Check the ecu-b fuse from the instrument panel junction block.
- Measure the resistance of the fuse.
Standard resistance:
below 1 
- 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 no. 2 Floor wire connector from the occupant classification ecu.
- Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
- Measure the voltage of the wire harness side connector.
Standard voltage 
- Turn the ignition switch off.
- Measure the resistance of the wire harness side connector
standard resistance 
- 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)
End
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 ...
Sleep operation failure of occupant classification ecu
Description
During sleep mode, the occupant classification ecu reads the condition of
each sensor while the ignition
switch is off.
In this mode, if the occupant classification ecu detects ...
Other materials:
Downhill assist control switch
Components
Removal
Disconnect cable from negative battery
terminal
Caution:
Wait at least 90 seconds after disconnecting the
cable from the negative (-) battery terminal to
prevent airbag and seat belt pretensioner activation.
Remove downhill assist control switch
Detach t ...
Only passenger door lock / unlock functions do not operate
Description
The main body ecu receives lock / unlock switch signals and activates the
door lock motor accordingly.
Wiring diagram
Inspection procedure
Read value of intelligent tester (lock position switch)
Use the data list to check if the door lock is
functioning properly.
...
Diagnosis system
Description
The center airbag sensor controls the functions of the
supplemental restraint system (srs) on the vehicle.
Data of the srs can be read in the data link connector
3 (dlc3) of the vehicle. When the system seems to be
malfunctioning, use the intelligent tester to check for a
ma ...
