Front occupant classification sensor rh collision detection

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 b1786 is also output when the front seat assembly 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 b1786 can be cleared by performing the zero point calibration and sensitivity check.

Therefore, when dtc b1786 is output, first perform the zero point calibration and sensitivity check.

1. 1
   Perform zero point calibration
2. 2
   Connect the intelligent tester to the dlc3.
3. 3
   Turn the ignition switch on.
4. 4
   Using the intelligent tester, perform the zero point calibration (see page rs-241).

1. 1
   Perform sensitivity check
2. 2
   Using the intelligent tester, perform the sensitivity check (see page rs-241).

1. 1
   Check for dtc
2. 2
   Turn the ignition switch on.
3. 3
   Clear the dtcs (see page rs-249).

First clear dtcs stored in the occupant classification ecu and then in the center airbag sensor.

1. 1
   Turn the ignition switch off.
2. 2
   Turn the ignition switch on.
3. 3
   Check the dtcs (see page rs-249).

Dtcs other than dtc b1786 may be output at this time, but they are not related to this check.

1. 1
   Replace front seat assembly rh
2. 2
   Turn the ignition switch off.
3. 3
   Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
4. 4
   Replace the front seat rh (see page se-8).

Perform the inspection using parts from a normal vehicle if possible.

1. 1
   Perform zero point calibration
2. 2
   Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
3. 3
   Connect the intelligent tester to the dlc3.
4. 4
   Turn the ignition switch on.
5. 5
   Using the intelligent tester, perform the zero point calibration (see page rs-241).

1. 1
   Perform sensitivity check
2. 2
   Using the intelligent tester, perform the sensitivity check (see page rs-241).

1. 1
   Check for dtc
2. 2
   Turn the ignition switch on.
3. 3
   Clear the dtcs (see page rs-249).

First clear dtcs stored in the occupant classification ecu and then in the center airbag sensor.

1. 1
   Turn the ignition switch off.
2. 2
   Turn the ignition switch on.
3. 3
   Check the dtcs (see page rs-249).

Dtcs other than dtc b1786 may be output at this time, but they are not related to this check.

1. 1
   Replace occupant classification ecu
2. 2
   Turn the ignition switch off.
3. 3
   Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
4. 4
   Replace the occupant classification ecu (see page rs- 392).

   

1. 1
   Perform zero point calibration
2. 2
   Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
3. 3
   Connect the intelligent tester to the dlc3.
4. 4
   Turn the ignition switch on.
5. 5
   Using the intelligent tester, perform the zero point calibration (see page rs-241).

1. 1
   Perform sensitivity check
2. 2
   Using the intelligent tester, perform the sensitivity check (see page rs-241).