Air Bag Systems: Service Precautions

SUPPLEMENTAL RESTRAINT SYSTEM

PRECAUTION

CAUTION:
- The vehicle is equipped with a Supplemental Restraint System (SRS). It consists of a driver airbag,front passenger airbag, driver knee airbag, side airbag and curtain shield airbag. 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.
- Wait at least 90 seconds after the ignition 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 horn button assembly, front passenger airbag assembly, instrument panel airbag assembly lower No.1, airbag sensor assembly center, airbag sensor front, front seat airbag assembly, side airbag sensor assembly, curtain shield airbag assembly, airbag sensor rear, seat position airbag sensor or occupant classification ECU directly to hot air or flames.
- Be sure to perform the initialization of the occupant classification ECU if any of the following conditions occur. If the initialization is not performed, the SRS may not operate properly.
- The occupant classification ECU is replaced.
- Accessories (seatback tray, seat cover, etc.) are installed to the vehicle.
- The passenger seat is removed from the vehicle, and then reinstalled or replaced.
- The passenger airbag ON/OFF indicator light ("OFF") comes on when the passenger seat is not occupied.
- The vehicle is brought to the workshop for repair due to an accident or collision.

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 horn button assembly, front passenger airbag assembly, instrument panel airbag assembly lower No.1, airbag sensor assembly center, airbag sensor front, front seat airbag assembly, side airbag sensor assembly, curtain shield airbag assembly, airbag sensor rear, seat position airbag sensor and occupant classification ECU 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 repair.
- 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.
- Horn Button Assembly
- Front Passenger Airbag Assembly
- Instrument Panel Airbag Assembly Lower No.1
- Front Seat Airbag Assembly
- Curtain Shield Airbag Assembly
- Airbag Sensor Assembly Center
- Airbag Sensor Front
- Side Airbag Sensor Assembly
- Airbag Sensor Rear
- Seat Position Airbag Sensor
- Occupant Classification ECU

NOTE:
- Use a volt/ohmmeter with high impedance (10 kOhms /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.
- 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 memories by using a backup power supply from outside the vehicle.
- If the vehicle is equipped with a mobile communication system, refer to the applicable service precautions.




- When disconnecting the negative (-) battery terminal, initialize the mentioned systems after the terminal is reconnected.




1. EXPRESSIONS OF IGNITION SWITCH
The type of ignition switch used on this model differs according to the specifications of the vehicle. The expressions listed in the table.