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Home >> Lexus >> 2004 >> RX 330 FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 599 (Supplemental Restraint System) >> Occupant Classification System >> DTC B1796 Sleep Operation Failure of Occupant Classification ECU >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTC 
    1. Turn the ignition switch to the ON position.
    2. Clear the DTCs stored in the occupant classification ECU (See DTC CHECK / CLEAR  ).
    3. Clear the DTCs stored in the center airbag sensor assembly (See DTC CHECK / CLEAR  ).
    4. Turn the ignition switch to the LOCK position, and wait for at least 10 seconds.
    5. Turn the ignition switch to the ON position.
    6. Check the DTCs (See DTC CHECK / CLEAR  ).

      OK: 

      DTC B1796 is not output. 

      HINT:

      Codes other than DTC B1796 may be output at this time, but they are not related to this check.

    OK: USE SIMULATION METHOD TO CHECK 

    NG: Go to next step 

  2. 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 (See REMOVAL  ).
  3. 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" (See INITIALIZATION  ).

      OK: 

      "COMPLETED" is displayed. 

  4. PERFORM SENSITIVITY CHECK 
    1. Using the intelligent tester, perform "sensitivity check" (See INITIALIZATION  ).

      Standard values: 

      27 to 33 kg (59.52 to 72.75 lb) 

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