Toyota RAV4 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
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 ...
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:
Customize parameters
Hint:
The following items can be customized.
Notice:
When the customer requests a change in a function,
first make sure that the function can be customized.
Be sure to make a note of the current settings before
customizing.
When troubleshooting a function, first make sure that
the fu ...
Main body ecu communication stop mode
Description
Wiring diagram
Inspection procedure
Notice:
Turn the ignition switch off before measuring the resistances of the
main wire and the branch
wire.
After the ignition switch is turned off, check that the key reminder
warning system and light
reminder warning syste ...
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 fan and generator v belt
Remove the belt (see page em-6).
...