AIRBAG SYSTEM PRECAUTION

Tech Tips


    In the airbag system, the parts listed below are collectively referred to as the airbag sensors.

  • Airbag ECU assembly (center airbag sensor)

  • Front airbag sensors

  • Door side airbag sensors

  • Side airbag sensor assemblies

  • Rear airbag sensors


    The parts listed below are collectively referred to as the SRS parts.

  • Horn button assembly

  • Lower No. 1 instrument panel airbag assembly

  • Lower No. 2 instrument panel airbag assembly

  • Instrument panel passenger airbag assembly

  • Curtain shield airbag assemblies

  • Front seat airbag assemblies

  • Front seat outer belt assemblies

  • Rear seat 3 point type outer belt assemblies


    The parts listed below are collectively referred to as the pop up hood.

  • Pop up hood lifter assembly

  • Pedestrian protection sensor

  • Pedestrian detection chamber


  1. PRECAUTION FOR HANDLING SRS SYSTEM


    1. 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. Furthermore, if a mistake is made when servicing the SRS, it is possible that the SRS may fail to operate when required. Before servicing (including removal or installation of parts, inspection or replacement), be sure to read the following precautions carefully, then follow the procedures exactly as indicated in the repair manual.

  2. PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL


    1. As SRS malfunctions are difficult to confirm, Diagnostic Trouble Codes (DTCs) become the most important source of information when troubleshooting. When troubleshooting the SRS, always check for DTCs before disconnecting the cable from the negative (-) auxiliary battery terminal.

      Note

      After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

      Click here

    2. Work must be started at least 90 seconds after the power switch is turned off and the cable is disconnected from the negative (-) auxiliary battery terminal.

      CAUTION:


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

      • Never use a back-up power source (auxiliary battery or other) to avoid clearing the system memory. The back-up power source may inadvertently power the SRS and cause the SRS parts to deploy.

      Note

      When disconnecting the cable from the negative (-) auxiliary battery terminal, initialize the following system(s) after the cable is reconnected.

      System See Procedure
      Parking assist monitor system (w/o Parallel Parking Assist Function)

      Click here

      Parking assist monitor system (w/ Parallel Parking Assist Function)

    3. When the cable is disconnected from the negative (-) auxiliary battery terminal, the memory of various systems 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 to its previous state.

  3. GENERAL PRECAUTION


    1. Use a voltmeter/ohmmeter with high impedance (minimum = 10 kΩ) for troubleshooting electrical circuits.

    2. Information labels are attached to the SRS parts and pop up hood lifter assemblies. Follow the instructions on the labels.

    3. Never disassemble or attempt to repair any of the SRS parts or pop up hood lifter assemblies.

    4. If any of the SRS parts or pop up hood lifter assemblies are dropped, or if any cracks, dents or other defects are found, replace them with new parts.

    5. Never use SRS parts or pop up hood lifter assemblies from another vehicle. When replacing parts, use new parts.

    6. Do not expose any of the SRS parts or pop up hood lifter assemblies directly to high temperatures or flames.

    7. If the vehicle has been involved in a minor collision where the SRS did not deploy, the SRS parts and pop up hood lifter assemblies should be inspected before further use of the vehicle.

    8. Do not apply grease, detergent, oil or water to the SRS parts or pop up hood lifter assemblies. If applied, immediately wipe it off with a dry cloth.

    9. When deploying or storing the SRS parts or pop up hood lifter assemblies, avoid places with a high temperature (ambient temperature of 93°C (199°F) or higher for an airbag, 115°C (239°F) or higher for a pop up hood lifter assembly and 80°C (176°F) or higher for a pretensioner) and high humidity, and keep them away from electrical noise.

    10. Do not stack or place anything on top of the SRS parts or pop up hood lifter assemblies.

    11. When disposing of the vehicle, or an SRS part or pop up hood lifter assembly by itself, deploy it using SST before disposal. Deploy the SRS parts or pop up hood lifter assemblies in a safe place away from electrical noise.

      Tech Tips


    12. Never measure the resistance of the SRS parts or pop up hood lifter assemblies.

      CAUTION:

      Never measure the resistance of the SRS parts or pop up hood lifter assemblies because current from the tester may cause the SRS parts or pop up hood lifter assemblies to deploy.

  4. PRECAUTION FOR DISPOSAL OF SRS PARTS OR POP UP HOOD LIFTER ASSEMBLIES (NOT DEPLOYED)


    1. Before performing pre-disposal deployment of any SRS parts or pop up hood lifter assemblies, review and closely follow all applicable environmental and hazardous material regulations. Pre-disposal deployment may be considered hazardous material treatment.

    2. Never dispose of any SRS parts or pop up hood lifter assemblies that have not been deployed.

    3. Deploy the SRS parts or pop up hood lifter assemblies outdoors in a safe and level place where it will not disturb nearby residents.

    4. As the SRS parts or pop up hood lifter assemblies produce a loud sound when deployed, be sure to inform nearby residents before deployment.

    5. When deploying the SRS parts or pop up hood lifter assemblies, always use the specified SST and keep people at least 10 m (32.8 ft.) away.

    6. The SRS parts or pop up hood lifter assemblies may be accidentally activated by static electricity. To prevent this, be sure to touch a metal surface with your bare hands to discharge static electricity before handling the SRS parts or pop up hood lifter assemblies.

    7. Do not face the deployment side of an airbag or pop up hood lifter assembly down when deploying an airbag or pop up hood lifter assembly.

  5. PRECAUTION FOR DISPOSAL OF SRS PARTS OR POP UP HOOD LIFTER ASSEMBLIES (DEPLOYED)


    1. As the SRS parts or pop up hood lifter assemblies are very hot after being deployed, allow at least 30 minutes for them to cool down sufficiently before disposal.

    2. Do not apply water, etc. to any deployed SRS parts or pop up hood lifter assemblies.

    3. Use gloves and safety glasses when handling any deployed SRS parts or pop up hood lifter assemblies.

    4. Seal the deployed SRS parts or pop up hood lifter assemblies in a thick clear plastic bag when disposing them.

    5. Always wash your hands with water after disposing of deployed SRS parts or pop up hood lifter assemblies.

  6. PRECAUTION FOR HORN BUTTON ASSEMBLY, LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY, LOWER NO. 2 INSTRUMENT PANEL AIRBAG ASSEMBLY, INSTRUMENT PANEL PASSENGER AIRBAG ASSEMBLY, CURTAIN SHIELD AIRBAG ASSEMBLY, FRONT SEAT AIRBAG ASSEMBLY AND POP UP HOOD LIFTER ASSEMBLY


    1. Keep the deployment side of an airbag or pop up hood lifter assembly facing upward even when the airbag or pop up hood lifter assembly is temporarily removed during service.

      CAUTION:

      Always place a removed or a new airbag or pop up hood lifter assembly with the deployment side facing upward. Placing the airbag or pop up hood lifter assembly with the deployment side facing downward could cause a serious accident if the airbag or pop up hood lifter assembly deploys.

  7. PRECAUTION FOR FRONT SEAT OUTER BELT ASSEMBLY (PRETENSIONER) AND REAR SEAT 3 POINT TYPE OUTER BELT ASSEMBLY (PRETENSIONER)


    1. Do not touch the area around the retractor even when the pretensioner is temporarily removed during service.

      CAUTION:

      If the retractor unexpectedly operates and the belt is retracted during an operation, it could cause a serious accident.

  8. PRECAUTION FOR SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY


    1. Do not replace the spiral cable with sensor sub-assembly with the auxiliary battery connected and the power switch on (IG).

    2. Do not rotate the spiral cable with sensor sub-assembly without the steering wheel assembly installed, with the auxiliary battery connected and the power switch on (IG).

    3. Ensure that the steering wheel assembly is installed and aligned straight when inspecting the steering sensor.

    4. When rotating the spiral cable with sensor sub-assembly, make sure to push on the interlock to release the interlock mechanism.

    5. Be sure that the spiral cable with sensor sub-assembly is in the neutral position during installation and when removing and installing the steering wheel assembly.

      Click here

      CAUTION:

      If the steering wheel assembly is turned without the spiral cable with sensor sub-assembly installed in the neutral position, the cable may break.

  9. PRECAUTION FOR AIRBAG SENSORS


    1. Perform a diagnostic system check.

      Click here

    2. When the SRS parts are deployed (including when only an airbag or pretensioner is deployed) due to a collision, be sure to replace all sensors in the damaged areas (anywhere in need of repair) and airbag ECU assembly (center airbag sensor).

    3. Visually check the airbag sensors in undamaged areas for defects.


      1. The defects are as follows:


        • Cracks in the sensor housing

        • Dents in the sensor housing

        • Chips in the sensor housing

        • Cracks or other damage to the connector

        • Damage to the serial number

        If any defects are found or an airbag sensor has detected a major collision, replace the airbag sensor with a new one.

      2. PRECAUTION FOR PEDESTRIAN PROTECTION SENSOR


        1. Perform a diagnostic system check.

          Click here

        2. Visually check the pedestrian protection sensor for defects if the front bumper of the vehicle or the area around the bumper is damaged.


          1. The defects are as follows:


            • Cracks in the sensor housing

            • Dents in the sensor housing

            • Chips in the sensor housing

            • Cracks or other damage to the connector

            • Damage to the serial number

        3. If any defects are found or the pedestrian protection sensor has detected a major collision, replace the pedestrian protection sensor with a new one.

      3. When the pop up hood lifter assemblies are deployed due to a collision, be sure to replace the pedestrian protection sensor, pedestrian detection chamber and airbag ECU assembly (center airbag sensor).

      4. PRECAUTION FOR WIRE HARNESS AND CONNECTOR


        1. All wire harnesses except unexposed harnesses in the engine compartment are colored yellow.

        2. As special connectors are used, be careful when handling them.

      5. WHEN SERVICING DAMAGED VEHICLE


        1. If the hood release lever is pulled after the pop up hood lifter assemblies have been deployed, the hood may rise more.

        2. Before using an electric welder on the vehicle, remove any SRS parts or pop up hood lifter assemblies around the area being repaired.

          CAUTION:

          Make sure to remove any SRS parts or pop up hood lifter assemblies as necessary to prevent them from accidentally deploying.

        3. Before repairs, remove the airbag sensor assemblies or pedestrian protection sensor if impacts are likely to be applied to the sensor during repairs.

        4. Never expose an airbag sensor or pedestrian protection sensor directly to high temperatures.

        5. As the SRS parts or pop up hood lifter assemblies are very hot after being deployed, ensure that all wire harnesses and connectors around deployed SRS parts or pop up hood lifter assemblies are not damaged.

      6. CONDITIONS WHEN INSPECTION OF SRS PARTS OR POP UP HOOD LIFTER ASSEMBLIES IS NECESSARY


        1. When the vehicle is damaged in a collision, even if the SRS parts or pop up hood lifter assemblies are not deployed.

        2. When SRS system DTCs are output.