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
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:
Gcwr, twr and unbraked twr
Confirm that the gross trailer weight, gross combination weight, gross
vehicle weight, gross axle weight and tongue weight are all within the
limits.
Gcwr*
2Wd models: 5985 lb. (2715 Kg)
Awd models: 6100 lb. (2765 Kg)
Twr*
1500 Lb. (680 Kg)
Unbraked twr*
1000 Lb. (450 Kg)
*: ...
Problem symptoms table (2006/01- )
Hint:
Use the table below to help determine the cause of the
problem symptom. The potential causes of the symptoms are
listed in order of probability in the "suspected area" column
of the table. Check each symptom by checking the suspected
areas in the order they are listed. Replace p ...
Slip indicator light does not come on
Description
Refer to the description of "slip indicator light remains on" (see page
bc-152).
Wiring diagram
Refer to the slip indicator light circuit (see page bc-152).
Inspection procedure
Notice:
When replacing the abs and traction actuator, perform the zero point
calibration ( ...