Toyota Sienna Quiz
Supplemental restraint system

Sleep Operation Failure of Occupant Classification ECU

In this manual: Supplemental restraint system
Introduction — 55Service specifications — 7Maintenance — 7Engine — 264U151e automatic transaxle — 108Transfer — 19Propeller shaft — 8Drive shaft — 14Differential — 16Axle — 18Suspension — 37Tire and wheel — 54Brake control — 141Parking brake — 16Steering Column — 11Power steering — 18Air conditioning — 106Supplemental restraint system — 146Seat belt — 22Theft deterrent — 14Engine immobiliser — 17Cruise control — 65Lighting — 61Wiper and washer — 13Door lock — 42Meter — 28Audio / visual — 94Navigation — 108Park assist / monitoring — 33Horn — 5Garage door opener — 42GR-FE Engine control system — 126Supplemental restraint system — 147Other system — 14Windshield / windowglass — 43Mirror — 23Instrument panel — 6Seat belt — 22Seat — 92Engine hood / door — 104Exterior — 39Interior — 5Sliding roof — 9Multiplex communication — 18Can communication — 23
9steps
~54min
2/5difficulty
Done 0 of 9

DTC B1796 Sleep Operation Failure of Occupant Classification ECU

DESCRIPTION

During sleep mode, the occupant classification ECU reads the condition of each sensor while the ignition switch is off.

In this mode, if the occupant classification ECU detects an internal malfunction, DTC B1796 is output.

DESCRIPTION

INSPECTION PROCEDURE

1 CHECK DTC

  1. Turn the ignition switch to the ON position.
  2. Clear the DTCs stored in memory.
HINT: First clear DTCs stored in the occupant classification ECU and then in the center airbag sensor assembly.
  • Turn the ignition switch to the LOCK position.
  • Turn the ignition switch to the ON position.
  • Check the DTCs.

    • 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.

    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

    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".

    OK: The "COMPLETED" is displayed.

    4 PERFORM SENSITIVITY CHECK

    1. Using the intelligent tester, perform "Sensitivity check".

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

    END

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