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DTC B1795: Occupant Classification ECU Malfunction: Procedure

  1. CHECK DTC 
    1. Turn the ignition switch to the ON position, and wait for at least 10 seconds.
    2. Check for DTCs. Refer to DTC CHECK / CLEAR .

      Result

      A 

      DTCs B1771 and B1795 are output.

      B 

      DTC B1795 is output.

      HINT: 

      Codes other than DTCs B1771 and B1795 may be output at this time, but they are not related to this check.

    A → GO TO DTC B1771 

    B: Go to next step 

  2. CHECK FUSE 
    1. Measure the resistance of the ECU-B fuse.

      Standard resistance

      Below 1 Ω

    NG → REPLACE FUSE 

    OK: Go to next step 

  3. CHECK WIRE HARNESS (SOURCE VOLTAGE) 
    1. Turn the ignition switch to the LOCK position.
      Fig 1: Identifying O3 Connector Terminals
      GTY155691Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
    3. Disconnect the connector from the occupant classification ECU.
    4. Connect the negative (-) terminal cable to the battery.
    5. Turn the ignition switch to the ON position.
    6. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection Condition Specified Condition
      O3-1 (+B) -
      Body ground      		 Always 10 to 14 V
      O3-7 (IG) -
      Body ground      		 Ignition switch ON 10 to 14 V
    7. Turn the ignition switch to the LOCK position.
    8. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      O3-3 (GND) -
      Body ground      		 Always Below 1 Ω

    NG → REPAIR OR REPLACE WIRE HARNESS 

    OK: Go to next step 

  4. 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. Refer to REMOVAL .

    NEXT: Go to next step 

  5. PERFORM ZERO POINT CALIBRATION 
    1. Connect the negative (-) terminal cable to the battery.
    2. Connect the Techstream to the DLC3.
    3. Turn the ignition switch to the ON position.
    4. Using the Techstream, perform "zero point calibration". Refer to INITIALIZATION .

      OK

      "Zero Point Calibration is complete" is displayed.

    NEXT: Go to next step 

  6. PERFORM SENSITIVITY CHECK 
    1. Using the Techstream, perform "sensitivity check". Refer to INITIALIZATION .

      Standard values

      27 to 33 kg (59.52 to 72.75 lb)

    NEXT → END 

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