For All Vehicles: Precaution

Furthermore, if a mistake is made in servicing the SRS, it is possible the SRS may fail to operate properly. 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 information.

1. Malfunction symptoms of the SRS are difficult to confirm, so the diagnostic trouble codes (DTCs) become the most important source of information when troubleshooting. When troubleshooting the SRS, always check the DTCs before disconnecting the battery (see PRE-CHECK ).
2. To avoid serious injury, servicing the SRS must be started 90 seconds after:
   • The ignition switch is turned to the LOCK position.
   • The negative (-) terminal cable is disconnected from the battery.

   (The SRS is equipped with a back-up power source so that if work is started within 90 seconds of disconnecting the negative (-) terminal cable from the battery, the SRS may deploy.)

   Disconnecting the negative (-) terminal cable will erase clock memory and audio system presets. If you wish to do so, mark down data as necessary before disconnecting the cable. To avoid erasing the memory settings, never use a back-up power supply.

   Fig 1: Identifying Battery Negative Cable

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. In minor collisions where the SRS does not deploy, the steering wheel pad, front passenger airbag assembly, side airbag assembly, curtain shield airbag assembly, front airbag sensor assembly and seat belt pretensioner should be inspected before further use of the vehicle (see AIR BAG RESTRAINT SYSTEMS and INSPECTION ).
4. Never use SRS parts from another vehicle. When replacing parts, replace them with new parts.
5. Before repairs, remove the airbag sensor assembly if impacts are likely to be applied to the sensor during repairs.
6. Never disassemble and repair the airbag sensor assembly, steering wheel pad, front passenger airbag assembly, side airbag assembly, curtain shield air-bag assembly, front airbag sensor or seat belt pretensioner.
7. Replace if the airbag sensor, steering wheel pad, front passenger airbag assembly, side airbag assembly, curtain shield airbag assembly, front airbag sensor assembly or seat belt pretensioner if it has been dropped, or if there are cracks, dents or other defects in its case, bracket or connector.
8. Do not directly expose the airbag sensor assembly, steering wheel pad, front passenger airbag assembly, front airbag sensor assembly or seat belt pretensioner to hot air or flames.
9. Use a voltmeter/ohmmeter with high impedance (10 kΩ/V minimum) for troubleshooting the electrical circuit.
10. Information labels are attached to the periphery of the SRS components. Follow the instructions on the labels.
11. After work on the SRS is completed, check the SRS warning light (see PRE-CHECK ).

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 result. Refer to AIR BAG RESTRAINT SYSTEMS concerning correct steering wheel installation.

Fig 2: Locating Marks on Steering Wheel

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. When removing the steering wheel pad or handling a new steering wheel pad, it should be placed with the pad top surface facing up see Fig 3. Storing the pad with its metallic surface facing upward may lead to a serious accident if the airbag inflates. In addition, do not store a steering wheel pad on top of one another.
2. Never measure the resistance of the airbag squib. This may cause the airbag to deploy, which is could cause serious injury.
3. Grease or detergents of any kind should not be applied to the steering wheel pad.
4. Store the steering wheel pad where the ambient temperature remains below 93°C (200°F), has low humidity and is away from electrical noise.
5. Before using an electric welder, first disconnect the airbag connector (the connector is yellow and has 4 pins) under the steering column near the combination switch connector.
6. As a safety measure, always deploy airbags using an SST before disposal (see AIR BAG RESTRAINT SYSTEMS ). Deploy airbags in a safe place away from electrical noise.
   Fig 3: Placing Method of Steering Wheel Pad

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002