For All Of Vehicles: Precaution

1. The MR2 is equipped with an Supplemental Restraint System (SRS), which includes the driver airbag, front passenger airbag assembly and seat belt pretensioners.

   Failure to carry out service operations in the correct sequence could cause the supplemental restraint system to unexpectedly deploy during servicing and lead to serious injury.

   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 manual.

2. GENERAL NOTICE
   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 inspect the DTCs before disconnecting the battery. (See DIAGNOSTICS ).
   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: Locating Negative Cable of Battery

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   3. In minor collisions where the SRS does not deploy, the steering wheel pad, front passenger airbag assembly, front airbag sensor assembly and seat belt pretensioner should be inspected before further use of the vehicle (See SPIRAL CABLE , INSPECTION respectively).
   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, front airbag sensor or seat belt pretensioner.
   7. Replace if the airbag sensor, steering wheel pad, front passenger 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 volt/ohmmeter with high impedance (10 kQJV minimum) for troubleshooting the electrical circuit.
   10. Information labels are attached to the periphery of the SRS components. Follow the instructions on the notices.
   11. After work on the SRS is completed, check the SRS warning light. (SeeSYSTEM OPERATION CHECK ).
3. SPIRAL CABLE (in Combination Switch)
   Fig 2: Locating Marks On Spiral Cable

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   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 INSTALLATION concerning correct steering wheel installation.

4. STEERING WHEEL PAD (with Airbag)
   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 illustration below. 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 SPIRAL CABLE ). Deploy airbags in a safe place away from electrical noise.
      Fig 3: Identifying Correct Method To Place Steering Wheel Pad

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 4: Instructing Never To Use An Ohmmeter On An Airbag Or Pretensioner

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. FRONT PASSENGER AIRBAG ASSEMBLY
   1. Always store a removed or new front passenger air-bag assembly with the airbag deployment direction facing up.

      Storing the airbag assembly with the airbag deployment direction facing down could cause a serious accident if the airbag inflate.

   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 DISPOSAL PROCEDURES ). Deploy airbags in a safe place away from electrical noise.
   Fig 5: Identifying Correct Airbag Deployment Direction

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   Fig 6: Instructing Never To Use An Ohmmeter On An Airbag Or Pretensioner

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. SEAT BELT PRETENSIONER
   1. Never measure the resistance of the seat belt pre-tensioner. This may cause the seat belt pretension-er to activate, which could cause serious injury.
   2. Never disassemble the seat belt pretensioner.
   3. Never install the seat belt pretensioner in another vehicle.
   4. Store the seat belt pretensioner where the ambient temperature remains below 80°C (176°F), has low humidity and is away from electrical noise.
   5. Before using an electric welder, first disconnect the connector (the connector is yellow and has 2 pins).
   6. As a safety measure, always activate the seat belt pretensioner before disposal ( DISPOSAL ). Activate the pretensioner in safe place away from electrical noise.
   7. The seat belt pretensioner becomes hot after activation. Allow it to cool before disposing. Never use water to cool seat belt pretensioner.
      Fig 7: Instructing Never To Use Ohmmeter On An Airbag Or Pretensioner

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
7. AIRBAG SENSOR ASSEMBLY
   1. If an airbag sensor assembly has been involved in a collision where its SRS has deployed, do not reuse it.
   2. The connectors to the airbag sensor assembly should be connected or disconnected with the sensor mounted on the floor. Failure to do so could cause undesired deployment of the SRS.
   3. 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.

      Even if only loosening the set bolts of the airbag sensor assembly, you must follow the above guidelines.

8. WIRE HARNESS AND CONNECTOR

   The SRS wire harness is integrated with the instrument panel wire harness assembly. All the connectors in the system are a standard yellow color. If the SRS wire harness becomes disconnected or the connector becomes broken etc., repair or replace it as shown in WIRE REPAIR.

1. Use only unleaded gasoline.
2. Avoid prolonged idling.

   Avoid idling the engine for more than 20 minutes.

3. Avoid spark jump test.
   1. Perform spark jump tests only when absolutely necessary. Perform this test as rapidly as possible.
   2. While testing, never race the engine.
4. Avoid prolonged engine compression measurement.

   Engine compression tests must be done as rapidly as possible.

5. Do not run engine when fuel tank is nearly empty.

   This may cause the engine to misfire and create an extra load on the converter.

6. Avoid coasting with ignition turned off.
7. Do not dispose of used catalyst with gasoline or oil contaminated parts.

For vehicles with mobile communication systems such as two-way radios and cellular telephones, observe the following precautions.

1. Install the antenna as far away as possible from the ECU and sensors of the vehicle's electronic system.
2. Install the antenna feeder at least 20 cm (7.87 in.) away from the ECU and sensors of the vehicle's electronic systems. For details about ECU and sensors locations, refer to the applicable component's section
3. Avoid winding the antenna feeder together with other wiring as much as possible, and also avoid running the antenna feeder parallel with other wire harnesses.
4. Check that the antenna and feeder are correctly adjusted.
5. Do not install powerful mobile communications system.