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Toyota Sienna Service Manual: System description

1. DESCRIPTION OF OCCUPANT CLASSIFICATION SYSTEM

  1.  GENERAL DESCRIPTION.
  1.  In the occupant classification system, the occupant classification ECU calculates the weight of the occupant based on a signal from the occupant classification sensors. This system recognizes the occupant to be a child if it detects a weight of less than 36 kg (79.37 lb), and disables the front passenger airbag and front passenger side - side airbag.
  2. This system is mainly comprised of 4 occupant classification sensors that detect the load on the front passenger seat. The occupant classification ECU controls the system, and the passenger airbag ON/OFF indicator indicates the ON/OFF condition of the front passenger airbag and front passenger side - side airbag.
  1.  OCCUPANT CLASSIFICATION SENSOR.

DESCRIPTION OF OCCUPANT CLASSIFICATION SYSTEM

  1. The occupant classification sensors are installed on 4 brackets connecting the seat rail and seat frame. Accordingly, when load is applied to the front passenger seat by an occupant sitting in it, the occupant classification sensors register a distortion.
  1.  DESCRIPTION FOR PASSENGER AIRBAG ON/OFF INDICATOR.

 DESCRIPTION FOR PASSENGER AIRBAG ON/OFF INDICATOR.

  1.  The passenger airbag ON/OFF indicator is installed on the air conditioning control assembly. This indicator informs the driver whether the occupant classification ECU puts the front passenger airbag assembly and side airbag (front passenger side) into an active state or inactive state.
  2.  If a malfunction occurs in the occupant classification system, "OFF" indication of the passenger airbag ON/OFF indicator and the SRS warning light will come on.
Precaution
1. INSPECTION PROCEDURE FOR VEHICLE INVOLVED IN ACCIDENT  Perform the zero point calibration and sensitivity check if any of the following conditions occur.  The occupant classi ...

How to proceed with troubleshooting
The intelligent tester can be used in steps 4, 6, 8 and 9. 1 VEHICLE BROUGHT TO WORKSHOP 2 CUSTOMER PROBLEM ANALYSIS 3 PASSENGER AIRBAG ON/OFF INDICATOR CHECK 4 DTCs CHECK (Present and Past ...

Other materials:

Door Courtesy Switch Circuit
DESCRIPTION The Multiplex network body ECU detects the condition of the door courtesy switch assembly. WIRING DIAGRAM INSPECTION PROCEDURE 1 READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to DLC3.  Turn the ignition switch to ON and push the intelligent tester ...

Removing the second seats
Removing the second outside seats (Tip-up seats) Pull the armrests up. Pull the seatback adjustment lever and fold down the seatback. The cushion will tip up. Slide the seat forward to a lock position. Pull the release lever under the cushion and simultaneously lift the ...

Control Display
Safety information NOTICE Objects in the area in the front of the Control Display can shift and damage the Control Display. There is a risk of damage to property. Do not place objects in the area in front of the Control Display. Switching on/off automatically The Control Display is switched on auto ...

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