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Home >> Toyota >> 2007 >> Camry CE, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 63 (Supplemental Restraint System - Occupant Classification System) >> Occupant Classification System >> DTC B1794: Open in Occupant Classification ECU Battery Positive Line (2006/03-2006/10) >> Inspection Procedure
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Inspection Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK BATTERY 
    1. Measure the voltage of the battery.

      Standard voltage: 11 to 14 V 

    NG: REPLACE BATTERY 

    OK:   Go To Next Step

  2. CHECK FUSE 
    1. Check 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 power switch off.
    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 power switch on (IG).
    6. Measure the voltage and resistance according to the value(s) in TESTER CONNECTION SPECIFIED CONDITION TABLE .
      Fig 1: Checking Wire Harness (Source Voltage)
      G05013198Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage and resistance: for Power seat 

      TESTER CONNECTION SPECIFIED CONDITION TABLE

      Tester connection Condition Specified condition
      T10-1 (+B)-Body ground Always 10 to 14 V
      T10-3 (GND) - Body ground Always Below 1 Ω
      T10-7 (IG) - Body ground Power switch on (IG) 10 to 14 V

      for Manual seat 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester connection Condition Specified condition
      O4-1 (+B) - Body ground Always 10 to 14 V
      O4-3 (GND) - Body ground Always Below 1 Ω
      O4-7 (IG) - Body ground Power switch on (IG) 10 to 14 V

    NG: REPAIR OR REPLACE WIRE HARNESS 

    OK:  Go To Next Step

  4. CHECK DTC 
    1. Turn the power switch off.
    2. Disconnect the negative (-) terminal cable from the battery.
    3. Connect the connector to the occupant classification ECU.
    4. Connect the intelligent tester to the DLC3.
    5. Connect the negative (-) terminal cable to the battery.
    6. Turn the power switch on (IG).
    7. Clear the DTCs stored in the occupant classification ECU (See DTC CHECK/CLEAR  ).
    8. Clear the DTCs stored in the center airbag sensor assembly (See DTC CHECK/CLEAR (2006/03-2006/10) ).
    9. Turn the power switch off.
    10. Turn the power switch on (IG), and wait for at least 10 seconds.
    11. Using the intelligent tester, check the DTCs of the occupant classification ECU (See DTC CHECK/CLEAR  ).

      OK: B1794 is not output. 

      HINT:

      Codes other than DTC B1794 may be output at this time, but they are not related to this check.

    NG: USE SIMULATION METHOD TO CHECK  (See DIAGNOSIS SYSTEM  )

    OK:  Go To Next Step

  5. REPLACE OCCUPANT CLASSIFICATION ECU 
    1. Turn the power switch off.
    2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
    3. Replace the occupant classification ECU (See REMOVAL (2006/03-2006/10) ).
  6. PERFORM ZERO POINT CALIBRATION 
    1. Connect the negative (-) terminal cable to the battery.
    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. 

  7. 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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