Toyota RAV4 (XA40) 2013-2018 Service Manual: Front occupant classification sensor lh collision detection
Description
Dtc b1785 is output when the occupant classification ecu receives a collision detection signal sent by the front occupant classification sensor lh when an accident occurs.
Dtc b1785 is also output when the front seat rh is subjected to a strong impact, even if an actual accident does not occur.
However, when the occupant classification ecu outputs a collision detection signal, even if the vehicle is not in a collision, dtc b1785 can be cleared by performing the zero point calibration and sensitivity check.
Therefore, when dtc b1785 is output, first perform the zero point calibration and sensitivity check.
Wiring diagram
Inspection procedure
- Perform zero point calibration
- 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)
- 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.
- Turn the ignition switch on.
- Check the dtcs (see page rs-249).
Ok: dtc b1785 is not output.
Hint:
Dtcs other than dtc b1785 may be output at this time, but they are not related to this check.
- Replace front seat assembly rh
- Turn the ignition switch off.
- Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
- Replace the front seat rh (see page se-8).
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 (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)
- 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.
- Turn the ignition switch on.
- Check the dtcs (see page rs-249).
Ok: dtc b1785 is not output.
Hint:
Dtcs other than dtc b1785 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 se- 8).
- 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
Rear occupant classification sensor rh circuit malfunction
Description
The rear occupant classification sensor rh circuit consists of the occupant
classification ecu and the
rear occupant classification sensor rh.
Dtc b1783 is recorded when a malf ...
Front occupant classification sensor rh collision detection
Description
Dtc b1786 is output when the occupant classification ecu receives a collision
detection signal sent by
the front occupant classification sensor rh when an accident occurs.
Dtc b ...
Other materials:
Data list / active test
Hint:
Using the intelligent tester's data list allows switch, sensor,
actuator and other item values to be read without removing
any parts. Reading the data list early in troubleshooting is
one way to save time.
Data list for occupant classification ecu
Connect the intelligent test ...
Intuitive parking assist
The distance from your
vehicle to objects, such as a
wall, when parallel parking
or maneuvering into a
garage is measured by the
sensors and communicated
via the multi-information
display or Multimedia Display
and a buzzer. Always
check the surrounding area
when using this system.
System components
...
Center airbag sensor assembly malfunction
Description
The center airbag sensor consists of the airbag sensor, the safing sensor,
the drive circuit, the diagnosis
circuit and the ignition control.
If the center airbag sensor receives signals from the airbag sensor, it
determines whether or not the srs
should be activated.
Dt ...
