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

1. Check for dtc

1. Turn the ignition switch on, and wait for at least 10 seconds.
2. 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.

2. Check fuse (ecu-b)

1. Check the ecu-b fuse from the instrument panel junction block.
2. Measure the resistance of the fuse.

Standard resistance: below 1

3. Check wire harness (source voltage)

1. Turn the ignition switch off.
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Disconnect the no. 2 Floor wire connector from the occupant classification ecu.
4. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
5. Measure the voltage of the wire harness side connector.

Standard voltage

6. Turn the ignition switch off.
7. Measure the resistance of the wire harness side connector

standard resistance

4. Replace occupant classification ecu

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

Hint:

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

5. Perform zero point calibration

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

Ok: completed is displayed.

6. Perform sensitivity check

1. 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