Airbag System: Precaution

CAUTION:

The vehicle is equipped with a Supplemental Restraint System (SRS). It consists of a driver airbag, front passenger airbag, driver side knee airbag, front passenger side knee airbag, side airbag, curtain shield airbag, rear side airbag, front seat belt pretensioner and rear seat belt pretensioner. Failure to carry out service operations in the correct sequence could cause the SRS to unexpectedly deploy during servicing, possibly leading to a serious accident. Further, if a mistake is made in servicing the SRS, it is possible that the SRS may fail to operate when required. Before performing servicing (including removal or installation of parts, inspection or replacement), be sure to read the following items carefully, then follow the correct procedures indicated in the repair manual.
Wait at least 90 seconds after the engine switch is turned off and the negative (-) terminal cable is disconnected from the battery before starting the operation.
(The SRS is equipped with a backup power source, so that if work is started within 90 seconds after disconnecting the negative (-) terminal cable of the battery, the SRS may be deployed).
Do not expose the steering pad, front passenger airbag assembly, driver side knee airbag assembly, front passenger side knee airbag assembly, center airbag sensor assembly, front airbag sensor, front seat inner belt assembly, seat position airbag sensor, occupant classification ECU, front seat airbag assembly, side airbag sensor, curtain shield airbag assembly, rear seat airbag assembly, rear airbag sensor, front seat outer belt assembly or rear seat outer belt assembly directly to hot air or flames.

NOTE:

Malfunction symptoms of the SRS are difficult to confirm, so DTCs are the most important source of information when troubleshooting. When troubleshooting the SRS, always inspect DTCs before disconnecting the battery.
Even in the case of a minor collision when the SRS does not deploy, the steering pad, front passenger airbag assembly, driver side knee airbag assembly, front passenger side knee airbag assembly, center airbag sensor assembly, front airbag sensor, front seat inner belt assembly, seat position airbag sensor, occupant classification ECU, front seat airbag assembly, side airbag sensor, curtain shield airbag assembly, rear seat airbag assembly, rear airbag sensor, front seat outer belt assembly or rear seat outer belt assembly should be inspected.
Before repair work, remove the airbag sensor if any kind of shock is likely to occur to the airbag sensor during the operation.
Never use SRS parts from another vehicle. When replacing parts, replace them with new ones.
Never disassemble or repair any of the following parts in order to reuse them. If any of these parts have been dropped, or a defect is found (e.g. cracks, dents or any other defects) in any of the housings, brackets or connectors, then replace the part with a new one.
1. Steering Pad
2. Front Passenger Airbag Assembly
3. Driver Side Knee Airbag Assembly
4. Front Passenger Side Knee Airbag Assembly
5. Front Seat Airbag Assembly
6. Curtain Shield Airbag Assembly
7. Rear Seat Airbag Assembly
8. Center Airbag Sensor Assembly
9. Front Airbag Sensor
10. Front Seat Inner Belt Assembly
11. Seat Position Airbag Sensor
12. Occupant Classification ECU
13. Side Airbag Sensor
14. Rear Airbag Sensor
15. Front Seat Outer Belt Assembly
16. Rear Seat Outer Belt Assembly
Use a volt/ohmmeter with high impedance (10 kΩ/V minimum) for troubleshooting the electrical circuits.
Information labels are attached near the SRS components. Follow the instructions in the caution.
After work on the SRS is completed, perform the SRS warning light check (See DIAGNOSIS SYSTEM ).
When the negative (-) terminal cable is disconnected from the battery, the memory will be cleared. Because of this, be sure to make a record of the contents memorized in each system before starting work. When work is finished, adjust each system as it was before. Never attempt to avoid erasing vehicle system memory by using a backup power supply from outside the vehicle.
If the vehicle is equipped with a mobile communication system, refer to the PRECAUTION in the INTRODUCTION section.
When disconnecting (he negative (-) battery cable, initialize the following systems after the cable is reconnected.

SYSTEM NAME PAGE REFERENCE

System Name	See procedure
Intuitive Parking Assist System	INITIALIZATION
Power Window Control System	INITIALIZATION
Variable Gear Ratio Steering System	INITIALIZATION

HINT:

In the airbag system, the center airbag sensor assembly, front airbag sensor LH and RH, side airbag sensor LH and RH, rear airbag sensor LH and RH are collectively referred to as the airbag sensors.

HANDLING PRECAUTIONS FOR AIRBAG SENSORS
1. Before starting the following operations, wait for at least 90 seconds after disconnecting the negative (-) terminal cable from the battery:
  1. Replacement of the airbag sensors.
  2. Adjustment of the front/rear doors of the vehicle equipped with the side airbag and curtain shield airbag (fitting adjustment).
2. When connecting or disconnecting the airbag sensor connectors, ensure that each sensor is installed in the vehicle.
3. Do not use the airbag sensors which has been dropped during the operation or transportation.
4. Do not disassemble the airbag sensors.
INSPECTION PROCEDURE FOR VEHICLE INVOLVED IN ACCIDENT
1. When the airbag has not deployed, confirm the DTCs by checking the SRS warning light. If there is any malfunction in the SRS airbag system, perform troubleshooting.
2. When any of the airbags have deployed, replace the airbag sensors and check the installation condition.

SRS CONNECTORS

SRS connectors are located as shown in the following illustration.

Fig 1: Airbag System Diagram (Driver Side)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Airbag System Diagram (Passenger Side)

ITEM APPLICATION CHART

No.	Item	Application
(1)	Terminal Twin-Lock Mechanism	Connectors 5, 6, 7, 8, 9, 10, 19, 20, 31, 32, 33, 34
(2)	Activation Prevention Mechanism	Connectors 10, 12, 14, 20, 22, 26, 30, 32, 34
(3)	Half Connection Prevention Mechanism	Connectors 5, 7, 9, 20, 24, 28, 32, 33
(4)	Connector Position Assurance Mechanism	Connector 7
(5)	Connector Lock Mechanism (1)	Connectors 11, 13, 21, 25, 29
(6)	Connector Lock Mechanism (2)	Connector 2, 4
(7)	Improper Connection Prevention Lock Mechanism	Connector 1, 3

All connectors in the SRS, except the seat position airbag sensor connector, are colored yellow to distinguish them from other connectors. These connectors have special functions, and are specially designed for the SRS. All SRS connectors use durable gold-plated terminals, and are placed in the locations shown on the previous page to ensure high reliability.
1. Terminal twin-lock mechanism:
  All connectors with a terminal twin-lock mechanism have a two-piece component consisting of a housing and a spacer. This design enables the terminal to be locked securely by two locking devices (the retainer and the lance) to prevent terminals from coming out.
  
  Fig 3: Identifying Male And Female Connector Pins Housing
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Activation prevention mechanism:
  All connectors with an activation prevention mechanism contain a short spring plate. When these connectors are disconnected, the short spring plate creates a short circuit by automatically connecting the positive (+) and negative (-) terminals of the squib.
  
  Fig 4: Identifying Activation Prevention Mechanism
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Half connection prevention mechanism:
  If the connector is not completely connected, the connector is disconnected due to the spring operation so that no continuity exists.
  
  Fig 5: Identifying Half Connection Prevention Mechanism
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Connector position assurance mechanism:
  Only when the housing lock (white part) is completely engaged, the CPA (yellow part) slides, which completes the connector engagement.
  
  Fig 6: Identifying Connector Position Assurance Mechanism
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Connector lock mechanism (1):
  Locking the connector lock button connects the connector securely.
  
  Fig 7: Identifying Connector Lock Mechanism
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. Connector lock mechanism (2):
  Both the primary lock with holder lances and the secondary lock with retainer prevent the connectors from becoming disconnected.
  
  Fig 8: Identifying Connector Lock Mechanism
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
7. Improper connection prevention lock mechanism:
  When connecting the holder, the lever is pushed into the end by rotating around the A axis to lock the holder securely.
  
  Fig 9: Identifying Improper Connection Prevention Lock Mechanism
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

DISCONNECTION OF CONNECTORS FOR STEERING PAD, FRONT PASSENGER AIRBAG ASSEMBLY (SQUIB SIDE), DRIVER SIDE KNEE AIRBAG ASSEMBLY, FRONT PASSENGER SIDE KNEE AIRBAG ASSEMBLY, CURTAIN SHIELD AIRBAG ASSEMBLY, FRONT SEAT OUTER BELT ASSEMBLY AND REAR SEAT OUTER BELT ASSEMBLY
HINT:

Tape up the screwdriver tip before use.
1. Release the lock button (yellow part) of the connector using a screwdriver.
2. Insert the screwdriver tip between the connector and the base, and then raise the connector.
  
  Fig 10: Inserting Screwdriver Tip Between Connector And Base
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CONNECTION OF CONNECTORS FOR STEERING PAD, FRONT PASSENGER AIRBAG ASSEMBLY (SQUIB SIDE), DRIVER SIDE KNEE AIRBAG ASSEMBLY, FRONT PASSENGER SIDE KNEE AIRBAG ASSEMBLY, CURTAIN SHIELD AIRBAG ASSEMBLY, FRONT SEAT OUTER BELT ASSEMBLY AND REAR SEAT OUTER BELT ASSEMBLY
1. Connect the connector.
2. Push down securely on the lock button, (yellow part) of the connector (When locking, a click sound can be heard.)
  
  Fig 11: Pushing Down Lock Button
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
DISCONNECTION OF CONNECTOR FOR FRONT PASSENGER AIRBAG ASSEMBLY (INSTRUMENT PANEL WIRE SIDE)
1. Place a finger on the slider, slide the slider to release the lock, and then disconnect the connector.
  
  Fig 12: Placing Finger On Slider
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CONNECTION OF CONNECTOR FOR FRONT PASSENGER AIRBAG ASSEMBLY (INSTRUMENT PANEL WIRE SIDE)
1. Connect the connector as shown in the illustration. (When locking, make sure that the slider returns to its original position and a click sound can be heard.)
  HINT:
  
  When connecting, the slider will side. Be sure not to touch the slider while connecting, as it may result in an insecure fit.
  
  Fig 13: Connecting Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
DISCONNECTION OF CONNECTORS FOR FRONT SEAT AIRBAG ASSEMBLY AND REAR SEAT AIRBAG ASSEMBLY
1. Place a finger on the slider, slide the slider to release the lock, and then disconnect the connector.
  
  Fig 14: Placing Finger On Slider
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CONNECTION OF CONNECTORS FOR FRONT SEAT AIRBAG ASSEMBLY AND REAR SEAT AIRBAG ASSEMBLY
1. Connect the connector as shown in the illustration. (When locking, make sure that the slider returns to its original position and a click sound can be heard.)
  HINT:
  
  When connecting, the slider will slides. Be sure not to touch the slider while connecting, as it may result in an insecure fit.
  
  Fig 15: Connecting Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
DISCONNECTION OF CONNECTOR FOR CENTER AIRBAG SENSOR ASSEMBLY
1. Pull the lever by pushing part A as shown in the illustration and disconnect the holder (with connectors).
  
  Fig 16: Pulling Lever
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  HINT:
  
  Perform the following procedures when replacing the holder.
2. Remove the holder.
  1. Using a screwdriver, unlock the retainer.
    
    Fig 17: Unlocking Retainer
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Release the fitting lance and remove the holder.
    
    Fig 18: Releasing Fitting Lance
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Install the holder.
  1. Install the connectors to the holder. (When locking, a click sound can be heard.)
    HINT:
    
    The retainer is locked when the holder is connected.
CONNECTION OF CONNECTOR FOR CENTER AIRBAG SENSOR ASSEMBLY
1. Firmly insert the holder (with connectors) into the center airbag sensor assembly until it can not be pushed any further.
  
  Fig 19: Installing Connectors To Holder
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Push the lever to connect the holder (with connectors). (When locking, a click sound can be heard.)
  HINT:
  
  The holder slides in to the center airbag sensor assembly when it is being connected. Be sure not to hold the holder while connecting, as it may result in an insecure fit.
  
  Fig 20: Pushing Lever To Connect Holder
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
DISCONNECTION OF CONNECTOR FOR FRONT AIRBAG SENSOR
1. Push down the housing lock (white part) and slide the CPA (yellow part). (At this time, the connector cannot be disconnected yet.)
2. Push down the housing lock (white part) again and disconnect the connector.
  HINT:
  
  Do not push down the A part shown in the illustration when disconnecting.
  
  Fig 21: Pushing Down Housing Lock
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. After disconnecting the connector, check that the position of the housing lock (white part) is as shown in the illustration.
  
  Fig 22: Identifying Correct And Incorrect Position Of Housing Lock
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CONNECTION OF CONNECTOR FOR FRONT AIRBAG SENSOR
1. Before connecting the connectors, check that the position of the housing lock (white part) is as shown in the illustration.
  
  Fig 23: Identifying Correct And Incorrect Position Of Housing Lock
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Be sure to engage the connectors until they are locked. (When locking, make sure that a click sound can be heard.)
  HINT:
  
  When connecting them, the housing lock (white part) slides. Be sure not to hold the housing lock (white part) and A part, as it may result in an insecure fit.
  
  Fig 24: Engaging Connectors
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
DISCONNECTION OF CONNECTORS FOR SIDE AIRBAG SENSOR AND REAR AIRBAG SENSOR
1. While holding both the sides of the outer connector locking sleeve, slide the sleeve in the direction shown by the arrow.
2. When the connector lock is released, the connectors are disconnected.
  HINT:
  
  Be sure to hold both sides of the sleeve. Holding the top and bottom will make disconnection difficult.
  
  Fig 25: Sliding Sleeve
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 26: Releasing Connector Lock
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CONNECTION OF CONNECTORS FOR SIDE AIRBAG SENSOR AND REAR AIRBAG SENSOR
1. Connect the connector as shown in the illustration (When locking, make sure that the outer connector locking sleeve returns to its original position and a click sound can be heard).
  HINT:
  
  When connecting, the sleeve will slide. Be sure not to hold the outer while connecting, as it may result in an insecure fit.
  
  Fig 27: Connecting Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002