Toyota RAV4 manuals

Toyota Sienna Service Manual: 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 occupant classification sensor RH if an accident occurs.

DTC B1788 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 B1788 can be cleared by "Zero point calibration" and "Sensitivity check".

Therefore, if DTC B1788 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 B1788 is not output.

HINT: Codes other than DTC B1788 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 B1788 is not output.

HINT: Codes other than DTC B1788 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 "Zero point calibration".

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

END

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Other materials:

Removal
1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL 2. REMOVE ROOF HEADLINING ASSEMBLY HINT: Refer to the instructions for REMOVAL of the ROOF HEADLINING (See page IR-6). 3. REMOVE TIRE PRESSURE WARNING RECEIVER ASSEMBLY (a) Remove the bolt. (b) Disconnect the connector and remove the ...

Inspection
1. INSPECT STEERING PAD SWITCH LH (w/o Navigation System)  Measure the resistance according to the values in the table below. Standard resistan If the result is not as specified, replace the steering pad switch LH. 2. INSPECT STEERING PAD SWITCH RH (w/ Navigation System) ...

Removal
1. REMOVE ENGINE ASSEMBLY WITH TRANSAXLE HINT: See page EM-26 2. SECURE ENGINE (See page EM-37) 3. REMOVE GENERATOR ASSEMBLY (See page CH-17) 4. REMOVE COMPRESSOR AND MAGNETIC CLUTCH (See page AC-227) 5. REMOVE NO. 1 ENGINE FRONT MOUNTING BRACKET LH (See page EM-42) 6. REMOVE NO. 2 IDLER PU ...

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