POST-COLLISION DIAGNOSIS


Perform the inspection and service on post-collision vehicles according to the procedures below regardless of the deployment or activation statuses of air bags, lap pre-tensioner and seat belt pre-tensioner.

SRS-ECU MEMORY CHECK


1.Connect M.U.T.-III to the diagnosis connector (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points ).
2.Use M.U.T.-III to read all the diagnosis codes.
note If the battery power is not supplied because of the collision impact, M.U.T.-III and SRS-ECU cannot communicate with each other. When this occurs, check or repair the instrument panel harness.
3.Erase the stored memory of diagnosis code, and then wait for 45 seconds or more to read the diagnosis code again. However, when the air bag has been deployed or if SRS-ECU is judged to be failure, do not erase the stored memory of diagnosis code.

REPAIR PROCEDURE

<DRIVER’S AND FRONT PASSENGER’S AIR BAGS ARE DEPLOYED>
1.Replace the following parts with new ones.

  • SRS-ECU (Refer to ).
  • Driver’s air bag module (Refer to ).
  • Passenger’s (front) air bag module (Refer to ).
  • Seat belt with pre-tensioner (Refer to ).
  • Front impact sensor (Refer to ).
  • Instrument trim assembly (Refer to GROUP 52A - Instrument Panel Assembly ).
2.Check the following parts. If there is an abnormality, replace with new parts.

  • Clock spring (Refer to ).
  • Steering wheel, steering column assembly

      • (1) Check that the driver’s air bag module is installed to the steering wheel correctly.
      (2) Check the steering wheel for noise, binding, operational failure, and play.
      (3) Check the shock absorbing mechanism of steering column shaft assembly (Refer to GROUP 37 - On-vehicle Service ).
3.Instrument panel assembly (Refer to GROUP 52A - Instrument Panel Assembly ).
4.Check the wiring harness for binding, the connector for damage, and the terminal for deformation (Refer to ).

<AIR BAG NOT DEPLOYED BECAUSE OF LOW-SPEED COLLISION>
1.Check the SRS air bag components and seat belt assembly according to the following procedures.
2.Check the operation of seat belt. If the seat belt cannot be drawn out, replace the seat belt with a new one.
3.If dents, fractures, deformation or frays are found by visual inspection, the relevant SRS airbag component or the seat belt assembly (such as pre-tensioner, retractor, buckle) must be replaced.
4.For removal and installation of parts, refer to "Servicing the SRS air bag/seat belt with pre-tensioner" .

SRS-ECU

1.Check the SRS-ECU case and bracket for dent, crack, or deformation.
2.Check the connector and wiring harness for damage, and the terminal for deformation.
3.Check that SRS-ECU is installed correctly.

DRIVER’S AND PASSENGER’S (FRONT) AIR BAG MODULE
1.Check the pad cover for dent, crack, or deformation.

2.Check the connector for damage, the terminal for deformation, and the harness for binding.
3.Check the inflator case for dent, crack, or deformation.
4.Check that the air bag module is installed correctly.

CLOCK SPRING

1.Check the connector and protector tube for damage, and the terminal for deformation.
2.Check the case for damage.

STEERING WHEEL, STEERING COLUMN ASSEMBLY
1.Check that the driver’s air bag module is installed to the steering wheel correctly.
2.Check the steering wheel for noise, binding, operational failure, and play.
3.Check the shock absorbing mechanism of steering column shaft assembly (Refer to GROUP 37 - On-vehicle Service ).

SEAT BELT PRE-TENSIONER <Driver’s side>

1.Check the seat belt pre-tensioner crack or deformation.
2.Check the connector for damage and the terminal for deformation.

FRONT IMPACT SENSOR

1.Check the front impact sensor for dent, crack or deformation.
2.Check the connector for damage, the terminal for deformation, and the harness for binding.

HARNESS CONNECTOR
Check the wiring harness for binding, the connector for damage, and the terminal for deformation (Refer to ).