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:
Inspection
Inspect crankshaft position sensor
Measure the resistance of the sensor.
Standard resistance
Notice:
Cold and hot mean the temperature of the coils
themselves. Cold is from -10 to 50°c (14 to
122°f) and hot is from 50 to 100°c (122 to
212°f).
If the result is not as specif ...
Defogging the windshield
Press .
The dehumidification function
operates and fan speed increases.
Set the outside/recirculated air
mode button to outside air mode if
the recirculated air mode is used.
(It may switch automatically.)
To defog the windshield and the
side windows early, turn the air
flow and t ...
Compressor circuit
Description
When the a/c switch is turned on, the magnetic clutch on signal is sent from
the air conditioning
amplifier. Then the mg clt relay turns on to operate the magnetic clutch.
Wiring diagram
Inspection procedure
Perform active test by intelligent tester (a/c mag clutch)
C ...
