Toyota Corolla (E120) 2002–2008 Repair Manual / Introduction / Repair instruction / Precaution / For vehicles equipped with srs airbag and seat belt pretensioner

Toyota Corolla (E120): For vehicles equipped with srs airbag and seat belt pretensioner

Hint

: the vehicle is equipped with an srs (supplemental restraint system), such as the horn button assembly, the instrument panel passenger airbag assembly, the front seat airbag assembly, the center airbag sensor assembly, the front airbag sensor, the side airbag sensor and the seat belt pretensioner.

Failure to carry out the service operations in the correct sequence could cause the supplemental restraint system to unexpectedly deploy during servicing. It may lead to a serious accident.

Furthermore, if a mistake is made in servicing the supplemental restraint system, it is possible that the srs will fail to operate when required. Before servicing (including removal or installation of parts, inspection or replacement), be sure to read the following items carefully. Then follow the correct procedure described in this manual.

1. General notice

1. Malfunction symptoms of the supplemental restraint system are difficult to confirm, so the diagnostic trouble codes become the most important source of information when troubleshooting.

   When troubleshooting the supplemental restraint system, always check the diagnostic trouble codes before disconnecting the battery .

2.  Work must be started after 90 seconds from the time the ignition switch is turned to the ”lock” position and the negative (–) terminal cable is disconnected from the battery.

   (The supplemental restraint system is equipped with a back–up power source, so, if work is started within 90 seconds after disconnecting the negative (–) terminal cable from the battery, the srs may deploy.) When the negative (–) terminal cable is disconnected from the battery, memory of the clock and audio systems will be cancelled. So, before starting work, make a record of the memorized contents in each memory system. Then, when work is finished, reset the clock and audio systems as before. To avoid erasing the memory in each memory system, never use a back–up power supply from another battery.

3.  Even in case of a minor collision where the srs does not deploy, the horn button assembly, the instrument panel passenger airbag assembly, the front seat airbag assembly and the seat belt pretensioner should be inspected (s 60–14, 60–26, 60–32 and 61–9).
4.  Never use srs related parts from another vehicle. When replacing parts, replace them with new parts.
5. Before repairs, remove the airbag sensor if shocks are likely to be applied to the sensor during repairs.
6.  Never disassemble and repair the airbag sensor assembly, the horn button assembly, the instrument panel passenger airbag assembly, the front seat airbag assembly or the seat belt pretensioner.
7.  If the airbag sensor assembly, the side airbag sensor assembly, the horn button assembly, the instrument panel passenger airbag assembly, the front seat airbag assembly or the seat belt pretensioner have been dropped, or if there are cracks, dents or other defects in the case, bracket or connector, replace them with new ones.
8.  Do not directly expose the airbag sensor assembly, the horn button assembly, the instrument panel passenger airbag assembly, the front seat airbag assembly or the seat belt pretensioner to hot air or flames.
9.  Use a volt/ohmmeter with high impedance (10 kw/v minimum) for troubleshooting of an electrical circuit.
10.  Information labels are attached to the srs components. Follow the instructions on the notices.
11.  After work on the supplemental restraint system is completed, check the srs warning light

2. Spiral cable (in combination switch)

1.  the steering wheel must be fitted correctly to the steering column with the spiral cable at the neutral position, otherwise cable disconnection and other troubles may occur. Refer to page 60–22 on this manual concerning the correct installation of the steering wheel.

3. Horn button assembly (with airbag)

1.  when removing the horn button assembly or handling a new horn button, it should be placed with the pad top surface facing upward. Placing it with the pad surface facing downward may lead to a serious accident if the airbag accidentally inflates. Also, do not place the horn button on top of one another.
2.  Never measure the resistance of the airbag squib (this may cause the airbag to inflate, which is very dangerous).
3.  Grease should not be applied to the horn button assembly, and the pad should not be cleaned with detergents of any kinds.
4.  Store the horn button assembly where the ambient temperature remains below 93 °C (200°f), without high humidity and away from electrical noise.
5.  When using electric welding, first disconnect the airbag connector (4 yellow pins) under the steering column near the combination switch connector before starting work.
6.  When disposing of the vehicle or the horn button assembly alone, the airbag should be deployed using an sst before disposal .

   Perform the operation in a safe place away from electrical noise.

4. Instrument panel passenger airbag assembly

1. always store a removed or new instrument panel passenger airbag assembly with the airbag inflation direction facing upward. Placing the airbag assembly with the airbag inflation direction facing downward could cause a serious accident if the airbag inflates.
2.  Never measure the resistance of the airbag squib (this may cause the airbag to inflate, which is very dangerous).
3.  Grease should not be applied to the instrument panel passenger airbag assembly, and the airbag door should not be cleaned with detergents of any kind.
4.  Store the airbag assembly where the ambient temperature remains below 93 °C (200°f), without high humidity and away from electrical noise.
5.  When using electric welding, first disconnect the airbag connector (4 yellow pins) installed on the assembly before starting work.
6.  When disposing of a vehicle or the airbag assembly alone, the airbag should be deployed using an sst before disposal .

   Perform the operation in a safe place away from electrical noise.

5. Front seat airbag assembly

1. always store a removed or new front seat airbag assembly with the airbag inflation direction facing upward. Placing the airbag assembly with the airbag inflation direction facing downward could cause a serious accident if the airbag inflates.
2.  Never measure the resistance of the airbag squib (this may cause the airbag to inflate, which is very dangerous).
3.  Grease should not be applied to the front seat airbag assembly, and the airbag door should not be cleaned with detergents of any kind.
4.  Store the airbag assembly where the ambient temperature remains below 93 °C (200°f), without high humidity and away from electrical noise.
5.  When using electric welding, first disconnect the airbag connector (2 yellow pins) installed on the assembly before starting work.
6. When disposing of a vehicle or the side airbag assembly alone, the airbag should be deployed using an sst before disposal .

   Perform the operation in a safe place away from electrical noise.

6. Seat belt pretensioner

1. never measure the resistance of the seat belt pretensioner (this may cause the seat belt pretensioner to activate, which is very dangerous).
2.  Never disassemble the seat belt pretensioner.
3.  Never install the seat belt pretensioner to another vehicle.
4.  Store the seat belt pretensioner where the ambient temperature remains below 80 °C (176°f) without high humidity and away from electrical noise.
5.  When using electric welding, first disconnect the connector (2 yellow pins) before starting work.
6.  When disposing of a vehicle or the seat belt pretensioner alone, the seat belt pretensioner should be activated before disposal . Perform the operation in a safe place away from electrical noise.
7.  The seat belt pretensioner is hot after activation, so let it cool down sufficiently before disposal.

   Never apply water to cool down the seat belt pretensioner.

8.  Oil or water should not be put on the front seat outer belt, and the front seat outer belt should not be cleaned with detergents of any kind.

7. Airbag sensor assembly

1.  never reuse the airbag sensor assembly involved in a collision where the srs has deployed.
2.  The connectors to the airbag sensor assembly should be connected or disconnected with the sensor mounted on the floor. If the connectors are connected or disconnected while the airbag sensor assembly is not mounted to the floor, it could cause an undesired ignition of the supplemental restraint system.
3.  Work must be started after 90 seconds from the time the ignition switch is turned to the ”lock” position and the negative (–) terminal cable is disconnected from the battery, even if only loosening the set bolts of the airbag sensor assembly.

8. Wire harness and connector

1.  the srs wire harness is integrated with the instrument panel wire harness assembly. All the connectors in the system are in a standard yellow color. If the srs wire harness becomes disconnected or the connector becomes broken due to an accident, etc., Repair or replace it.