Toyota RAV4 manuals

Toyota Sienna Service Manual: Rear Occupant Classification Sensor LH Collision Detection

DTC B1787 Rear Occupant Classification Sensor LH Collision Detection

DESCRIPTION

DTC B1787 is output when the occupant classification ECU receives a collision detection signal sent by the rear occupant classification sensor LH if an accident occurs.

DTC B1787 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 B1787 can be cleared by "Zero point calibration" and "Sensitivity check".

Therefore, if DTC B1787 is output, first perform "Zero point calibration" and "Sensitivity check".

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

1 PERFORM ZERO POINT CALIBRATION

  1. Connect the intelligent tester to the DLC3.
  2.  Turn the ignition switch to the ON position.
  3.  Using the intelligent tester, perform "Zero point calibration".

OK: "COMPLETED" is displayed.

2 PERFORM SENSITIVITY CHECK

  1. Using the intelligent tester, perform "Sensitivity check".

Standard value: 27 to 33 kg (59.52 to 72.75 lb)

3 CHECK DTC

  1. Turn the ignition switch to the ON position.
  2.  Clear the DTCs stored in the memory
    HINT: First clear DTCs stored in the occupant classification ECU and then in the center airbag sensor assembly.
  3.  Turn the ignition switch to the LOCK position.
  4.  Turn the ignition switch to the ON position.
  5.  Check the DTCs.

OK: DTC B1787 is not output.

HINT: Codes other than DTC B1787 may be output at this time, but they are not related to this check.

4 REPLACE FRONT SEAT ASSEMBLY RH

  1. Turn the ignition switch to the LOCK position.
  2.  Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
  3.  Replace the front seat assembly RH ( for flat type, SE-48 for manual seat, SE-58 for power seat).

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

5 PERFORM ZERO POINT CALIBRATION

  1. Connect the negative (-) terminal cable to the battery.
  2.  Connect the intelligent tester to the DLC3.
  3.  Turn the ignition switch to the ON position.
  4.  Using the intelligent tester, perform "Zero point calibration".

OK: "COMPLETED" is displayed.

6 PERFORM SENSITIVITY CHECK

  1. Using the intelligent tester, perform "Sensitivity check".

Standard value: 27 to 33 kg (59.52 to 72.75 lb)

7 CHECK DTC

  1. Turn the ignition switch to the ON position.
  2.  Clear the DTCs stored in the memory.

    HINT: First clear DTCs stored in the occupant classification ECU and then in the center airbag sensor assembly.

  3.  Turn the ignition switch to the LOCK position.
  4.  Turn the ignition switch to the ON position.
  5.  Check the DTCs.

OK: DTC B1787 is not output.

HINT: Codes other than DTC B1787 may be output at this time, but they are not related to this check.

8 REPLACE OCCUPANT CLASSIFICATION ECU

  1. Turn the ignition switch to the LOCK position.
  2.  Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
  3.  Replace the occupant classification ECU.

9 PERFORM ZERO POINT CALIBRATION

  1. Connect the negative (-) terminal cable to the battery.
  2.  Connect the intelligent tester to the DLC3.
  3.  Turn the ignition switch to the ON position.
  4.  Using the intelligent tester, perform "Zero point calibration".

OK: "COMPLETED" is displayed.

10 PERFORM SENSITIVITY CHECK

  1. Using the intelligent tester, perform "Sensitivity check".

Standard value: 27 to 33 kg (59.52 to 72.75 lb)

END

Front Occupant Classification Sensor RH Collision Detection
DTC B1786 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 ...

Rear Occupant Classification Sensor RH Collision Detection
DTC B1788 Rear Occupant Classification Sensor RH Collision Detection DESCRIPTION DTC B1788 is output when the occupant classification ECU receives a collision detection signal sent by the rear o ...

Other materials:

Data list / active test
1. READ DATA LIST HINT: Using the DATA LIST displayed on the intelligent tester, you can read the value of the switch, sensor, actuator, etc. without parts removal. Reading the DATA LIST as the first step in troubleshooting is one way to shorten the labor time.  Connect the intelligen ...

Disassembly
HINT: On the RH side, use the same procedures as on the LH side. 1. REMOVE REAR DOOR WINDOW FRAME MOULDING REAR LH (See page ET-30) 2. REMOVE REAR DOOR WINDOW FRAME MOULDING SUB-ASSEMBLY LH (See page ET-21) 3. REMOVE SLIDE DOOR WINDOW GARNISH LH Fully open the slide door window. Remo ...

Problem symptoms table
Before inspecting the suspected areas listed in the table below, check the fuse and relay.  Before inspecting the suspected areas listed in the table below, check the DTCs.  Methods used to verify the cause of the problem are listed in order of probability in the suspected are ...

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