Restraints - 'Air Bag Off' Illuminates Intermittently

T-SB-0092-12

June 27, 2012

Passenger "AIRBAG OFF" Light Illuminates Intermittently

Service Category
Vehicle Interior

Section
Supplemental Restraint Systems

Market
USA





Applicability

Introduction

Some 2012 model year Yaris hatchback vehicles may exhibit a condition where the passenger "AIRBAG OFF" light may illuminate intermittently while driving and the passenger seat is unoccupied.This condition will not affect airbag operation. An updated Occupant Classification System Electronic Control Unit (OCS ECU) has been made available to address this condition. This updated OCS ECU logic will now illuminate the "AIRBAG OFF" light all the time when the vehicle is operated and the passenger seat is unoccupied or when the OCS ECU determines that the occupant does not meet the adult classification criteria.

Production Change Information





This bulletin applies to vehicles produced BEFORE the Production Change Effective VINs shown.





Warranty Information





Parts Information

Required Tools & Equipment

Repair Procedure

1. Inspect the Supplemental Restraint System (SRS) using Techstream.

NOTE

^ If there are any SRS codes in the SRS ECU, refer to the Technical Information System (TIS),applicable Repair Manual section, for diagnosis and repair.

^ This condition may set a B1650 Occupant Classification System Malfunction code in the SRS ECU.

2. If the vehicle is exhibiting the condition, replace the OCS ECU.

^ Refer to the Technical Information System (TIS), applicable model year Yaris Repair Manual:

^ 2012 Yaris (from 07/2011):

Vehicle Interior - Supplemental Restraint Systems - "Supplemental Restraint Systems: Occupant Classification ECU (for Hatchback): Removal / Installation"

3. After replacing the OCS ECU, the operation of the Passenger Airbag ON/OFF light will change.

A. Upon starting the vehicle the light will perform a bulb check.





B. After the bulb check is completed the Passenger Airbag light will illuminate "OFF" when the passenger seat is unoccupied or when the OCS ECU determines that the occupant does not meet the adult classification criteria.

C. When the OCS system determines that an occupant that meets the adult classification criteria is sitting in the passenger seat, the light will change to "ON".

4. Remove original Owner's Manual.

5. Place updated Owner's Manual in vehicle.

© 2012 Toyota Motor Sales, USA