Canada - Restraint - Erratic Passenger Airbag Indicator Lamp
BulletinTSB2454
Issue Date
July 20, 2007
Title
PASSENGER AIRBAG INDICATOR LAMP
Component
BODY COMPONENT
Models
'07 ES 350
INTRODUCTION:
The passenger airbag indicator lamp may switch from ON to OFF for front seat passengers weighing approximately 100 to 120 pounds, depending on their seating position. It is important for the front seat passengers to know that proper operation of the advanced frontal airbag system is highly dependent on the pressure placed on the seat cushion. Situations that add or subtract sensed weight can result in occupant misclassification. To minimize this situation:
- Check seating posture.
Passengers should be seated upright with their back against the seat back and feet on the floor.
- Check loading conditions.
- Extra weight from items, such as bags or groceries or toys, hanging on the seat back can add to the sensed weight of the front seat passenger.
- A rear seat passenger lifting the front seat with their legs, objects placed under the front seat, or the front seatback in contact with the rear seat can subtract from the sensed weight of the front seat passenger.
If the passenger airbag indicator lamp continues to switch ON to OFF after checking the above conditions, perform the following repair procedure.
NOTE:
The safest place for children is in the rear seat. Toyota recommends that you NEVER install a rearfacing child restraint in the front passenger seat, even if the passenger "Airbag OFF" lamp is illuminated. Please refer to the Owner's Manual for additional details.
APPLICABLE VEHICLES:
- 2007 model year ES 350 vehicles produced BEFORE the Production Change Effective VIN shown below.
PRODUCTION CHANGE INFORMATION:
WARRANTY INFORMATION:
PARTS INFORMATION:
REQUIRED SSTS:
REGISTRATION PROCEDURE NO. 1:
NOTE:
If any DTCs related to the occupant classification ECU are output, troubleshoot those DTCs by referring to the DIAGNOSTIC TROUBLE CODE CHART.
When ECU data saving or loading operations cannot be performed, replace the front seat cushion assembly (with occupant classification ECU and occupant classification sensor).
HINT:
When the occupant classification ECU is replaced, the previous ECU data MUST be saved in Techstream and loaded into the NEW ECU.
The previous ECU data will be saved in Techstream until it is loaded into the NEW occupant classification ECU.
ECU EXCHANGE PROCEDURE (Before Exchange) describes the procedure to save the data in Techstream from the occupant classification ECU that has been installed on the vehicle. ECU EXCHANGE PROCEDURE (After Exchange) describes the procedure to load the data from the previous ECU, stored in Techstream, into the NEW ECU.
1. Connect Techstream to the vehicle.
2. Turn the engine switch ON.
3. Store the occupant classification ECU data in Techstream.
A. Click Connect to Vehicle > Utility > ECU Exchange.
B. Follow the dialog boxes to complete the first step of the exchange process.
ECU REMOVAL PROCEDURE:
1. Disconnect the negative (-) battery terminal.
2. Remove the seat belt anchor cover cap RH.
3. Disconnect the front seat outer belt assembly RH.
4. Remove the front seat headrest assembly.
5. Remove the front seat outer track bracket cover RH.
6. Remove the front seat inner track bracket cover RH.
7. Remove the front seat rear outer track bracket cover RH.
8. Remove the front seat rear inner track bracket cover RH.
9. Remove the front seat assembly RH.
10. Remove the occupant classification ECU.
A. Disconnect the connector from the occupant classification ECU.
B. Remove the 2 nuts and occupant classification ECU.
ECU INSTALLATION PROCEDURE:
1. Install the occupant classification ECU with the 2 nuts
Torque: 3 N-m (31 kgf-cm, 27 in.-lbf)
2. Connect the connector.
NOTE:
- If the occupant classification ECU has been dropped or there are any cracks, dents, or other defects in the case or connector, replace the occupant classification ECU with a NEW one.
- When installing the occupant classification ECU, be careful that the SRS wiring does NOT interfere with other parts and is NOT pinched between other parts.
3. Install the front seat assembly RH.
Torque: 37 N-m (378 kgf-cm, 27 ft-lbf)
4. Install the front seat rear inner track bracket cover RH.
5. Install the front seat rear outer track bracket cover RH.
6. Install the front seat inner track bracket cover RH.
7. Install the front seat outer track bracket cover RH.
8. Install the front seat headrest assembly.
9. Connect the front seat outer belt assembly RH.
10. Install the seat belt anchor cover cap RH.
REGISTRATION PROCEDURE NO. 2:
1. Connect the negative (-) terminal cable to the battery.
2. Turn the engine switch ON.
3. Load the data from the previous ECU (stored in Techstream) into the newly installed ECU by the prompts on Techstream.
4. Turn the engine switch OFF.
5. Turn the engine switch ON.
6. Clear the DTCs stored in the memory.
ECU INITIALIZATION PROCEDURE:
NOTE:
Immediately after the battery terminal is reconnected, the main body ECU will NOT function, and the smart access system will NOT operate. To activate the main body ECU, perform a wireless door unlock or lock operation.
If the battery has been discharged, the engine CANNOT be started even after the battery has been recharged because the steering lock position CANNOT be recognized correctly.
To start the engine after the battery terminal is reconnected, perform the following steps:
1. To allow the steering lock ECU to learn the steering lock position, initialize the steering lock ECU.
A. Open and close the driver's door.
B. Wait for 10 seconds or more.
2. Re-initialize any affected power systems.
ZERO POINT CALIBRATION PROCEDURE:
1. Check that all of the following conditions are met:
- The vehicle is parked on a flat surface.
- No objects are placed on the front passenger seat.
- The front passenger seat belt buckle switch is OFF.
2. Adjust the seat position according to the following table:
3. Connect Techstream to the vehicle.
4. Turn the engine switch ON.
5. Perform the zero point calibration by following the prompts on Techstream.
HINT:
If the zero point calibration is performed when the seat is NOT in the correct position, DTC B1797 is output.
If the zero point calibration fails, DTC B1797 is output.
A. Click Occupant Detection > Utility > Zero Point Calibration.
B. Follow the dialog boxes to complete the Zero Point Calibration.
SENSITIVITY CHECK PROCEDURE:
1. Turn the engine switch OFF.
2. Place two 10 kg (22 lb) weights (total of 20 kg [44 lb]) on the front passenger seat.
NOTE:
Do NOT allow the weight to come into contact with the seatback when placing it on the seat cushion.
Place the weight in the area shown in the illustration.
3. Turn the engine switch ON (IG), and wait for at least 6 seconds.
4. Check that the passenger airbag ON/OFF indicator indicates OFF.
5. Add an additional 10 kg (22 lb) of weight (total of 30 kg [66.1 lb]) to the front passenger seat.
NOTE:
Do NOT allow the weight to come into contact with the seatback when placing it on the seat cushion.
Place the weight in the area shown in the illustration.
6. Check that the passenger airbag ON/OFF indicator indicates ON.
SEAT INSPECTION PROCEDURE:
1. Check the power seat operation.
2. Check the seat heater operation (with seat heater system).
A. Turn the engine switch ON.
B. Turn the seat heater switch ON.
C. Wait 5 minutes or more and confirm that the seat surface becomes warm.
SRS INSPECTION PROCEDURE:
1. Turn the engine switch ON, and check that the SRS warning light comes ON for approximately 6 seconds (primary check).
2. Check that the SRS warning light goes OFF approximately 6 seconds after the engine switch is turned ON (constant check).
NOTE:
Issue of this Technical Service Bulletin is to ensure that proper repair information is available. IT DOES NOT CONSTITUTE AN AUTHORIZATION FOR REPAIR. Normal provisions of the formal warranty policy, as applicable, will apply.