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Home >> Toyota >> 2007 >> Highlander Base, 2.4 D, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 41 (Supplemental Restraint System) >> Occupant Classification System >> DTC B1795 Occupant Classification ECU Malfunction >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2007 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR DTC 
    1. Turn the power switch ON (IG), and wait for at least 10 seconds.
    2. Check the DTCs (see DTC CHECK / CLEAR  ).

      Result 

      RESULT

      Result Proceed to
      DTC B1795 is output. A
      DTC B1771 and B1795 are output. B

      HINT:

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

    B: Go to DTC B1771 

    A: Go to Next Step 

  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 Ω 

    NG: REPLACE FUSE 

    OK: Go to Next Step 

  3. CHECK WIRE HARNESS (SOURCE VOLTAGE) 
    1. Turn the power switch OFF.
    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Disconnect the floor wire No. 2 connector from the occupant classification ECU.
    4. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    5. Measure the voltage of the wire harness side connector.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      O4-1 (+B) - Body ground Always 10 to 14 V
      O4-7 (IG) - Body ground Power switch ON (IG) 10 to 14 V
      Fig 1: Checking Wire Harness (Source Voltage)
      G05189642Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Turn the power switch OFF.
    7. Measure the resistance of the wire harness side connector.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      O4-3 (GND) - Body ground Below 1 Ω

    NG: REPAIR OR REPLACE WIRE HARNESS 

    OK: Go to Next Step 

  4. REPLACE OCCUPANT CLASSIFICATION ECU 
    1. Turn the power switch OFF.
    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Replace the occupant classification ECU.
  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 power switch ON (IG).
    4. Using the intelligent tester, perform the zero point calibration (see INITIALIZATION  ).

      OK: COMPLETED is displayed. 

  6. PERFORM SENSITIVITY CHECK 
    1. Using the intelligent tester, perform the sensitivity check (see INITIALIZATION  ).

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

    NEXT: END 

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