SRS - Calibration of Occupancy Classification System
ELECTRICALEL007-03
REVISED
August 11, 2003
Title
OCCUPANCY CLASSIFICATION SYSTEM CALIBRATION
Models
'04 ES 330 & RX 330
TSIB REVISION NOTICE:
December 17, 2003: 2004 ES 330 added to Applicable Vehicles; detection weight changed from 66 to 80 lbs; wording in Figure 4 and "Important" box shown with asterisks has been modified slightly.
The previous TSIB should be discarded.
Introduction
The 2004 model year ES 330 and RX 330 are equipped with an Occupancy Classification System that will disable the passenger front and side airbags when the passenger seat sensors detect a weight that is less than approximately 80 lbs (36 kg).
Applicable Vehicles
^ 2004 model year ES 330 and RX 330 vehicles.
Service Information
In the event of an Occupancy Classification System malfunction, both the SRS" and Airbag Off" lights will illuminate.
Diagnostic Tester support for this system includes:
^ DTC Check
^ Data List
^ Zero Point Calibration
^ Sensitivity Check
IMPORTANT SERVICE NOTE:
The "Zero Point Calibration" and "Sensitivity Check" for the Occupancy Classification System MUST be performed if:
^ The passenger seat has been removed from the vehicle.
^ The vehicle has been in a collision.
^ The Occupancy Classification ECU has been replaced.
^ For any reason, the indicated weight on the passenger seat (using the Lexus Diagnostic Tester) is not within 7 lbs (3.2 kg) of the actual weight on the seat.
^ Attempting to clear codes during diagnosis or after a repair. ("Zero point calibration" must be performed first in order to properly clear codes.)
Before performing "Zero Point Calibration" and "Sensitivity Check" verify the following:
^ The seatback pocket is empty.
^ Nothing is placed on the seat.
^ Nothing is placed under the seat.
Warranty Information
Required SSTs
NOTE:
Additional Diagnostic Tester Kits, Program Cards or SSTs may be ordered by calling SPX/OTC at 1-800-933-8335.
System Operation Overview
Calibration Procedure
Zero Point Calibration
Follow the screen flow to complete Zero Point Calibration.
NOTE:
The RX 330 is used as an example. Use the same procedure for the ES 330.
Sensitivity Check Procedure
Follow the screen flow to complete Sensitivity Check Procedure.
NOTE:
The RX 330 is used as an example. Use the same procedure for the ES 330.
IMPORTANT:
When performing the Sensitivity Check Procedure, make sure the test weights placed on the passenger seat are confirmed using an accurate scale. This is necessary to ensure proper system diagnosis.