Canada - Air Bag System - Occupant Classification System

Bulletin
TSB2041

Issue Date
October 14, 2004

Title
OCCUPANT CLASSIFICATION SYSTEM INITIALIZATION (DTC B1150 & B1650)

Component
BODY ELECTRICAL

Models
'04 ES 330 & RX 330

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).

After finding SRS B1650 code on ES 330 vehicles, or SRS B1150 on RX 330 vehicles, the next step is check codes in the OCCUPANT DETECT menu on the Diagnostic Tester. Take necessary steps to diagnose the root cause of the OCS DTC code BEFORE initializing the system.

APPLICABLE VEHICLES:
- 2004 model year ES 330 & RX330 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:






SYSTEM OPERATION OVERVIEW:

CALIBRATION PROCEDURE:

Zero Point Calibration

Follow the screen flow below 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 below to complete Sensitivity Check Procedure.














NOTE: The RX 330 is used as an example. Use the same procedure for the ES 330.