POST-COLLISION DIAGNOSIS


Whether or not the air bags have deployed, check and service the vehicle after collision as follows:

SRS-ECU MEMORY CHECK


1.
caution Refer to that the ignition switch is "LOCK" (OFF) when connecting or disconnecting M.U.T.-III.
Connect the M.U.T.-III to the diagnosis connector (Refer to GROUP 00, Diagnosis Function ).
2.Read (and write down) all displayed diagnosis codes (Refer to ).
note If battery power supply has been shut down by the collision, the M.U.T.-III cannot communicate with the SRS-ECU. Check and, repair if necessary, the instrument panel wiring harness before the next job.
3.Use the M.U.T.-III to read the data list (how long trouble(s) have continued and how often memory have been erased).

Data list
No
 Service Data Item
 Applicability
01
 Failure continuation time 1
 Maximum time to be stored: 9,999 minutes (approximately 7 days)
02
 Failure continuation time 2
10
 Elimination times
 Maximum time to be stored: 250 times
4.Erase the diagnosis codes and after waiting 5 seconds or more read (and write down) all displayed diagnosis codes. If the air bags have deployed or the malfunction of the SRS-ECU is suspected, do not erase the diagnosis codes.

REPAIR PROCEDURE

WHEN FRONT AIR BAGS DEPLOY IN A COLLISION.
1.Replace the following parts with new ones.

  • SRS-ECU (Refer to ).
  • Front air bag modules (Refer to ).
  • Seat belt with pre-tensioner (Refer to ).
  • Front impact sensors (Refer to ).
  • Instrument panel (Refer to GROUP 52A, Instrument Panel Assembly ).
2.Check the following parts and replace if there are any malfunctions.

  • Clock spring (Refer to ).
  • Steering wheel, steering column and shaft assembly (Refer to GROUP 37, Steering wheel , Steering shaft assembly ).
(1) Check the wiring harness (built into the steering wheel) and connectors for damage, and terminals for deformation.
(2) Install the air bag module to check fit or alignment with the steering wheel.
(3) Check the steering wheel for noise, binds or difficult operation and excessive free play.
(4) Check the steering column shaft shock absorbing mechanism (Refer to GROUP 37, On-Vehicle Service ).
3.Check the harness for binding, connectors for damage, poor connections, and terminals for deformation (Refer to ).

WHEN SIDE-AIRBAGS OR CURTAIN AIR BAGS DEPLOY IN A COLLISION.
1.Replace the following parts with new ones.

  • SRS-ECU (Refer to ).
  • Side impact sensors (Refer to ).
  • Curtain air bag modules (Refer to ).
  • Front seatback assembly (Refer to GROUP 52A, Front Seat Assembly ).
2.Check the harness for binding, connectors for damage, poor connections, and terminals for deformation (Refer to ).

WHEN AIR BAGS DO NOT DEPLOY IN LOW-SPEED COLLISION.
Check the SRS components. If visible damage such as dents, cracks, or deformation is found on the SRS components, replace them with new ones. Concerning parts removed for inspection, replacement with new parts and cautions in working, refer to

FRONT IMPACT SENSOR

1.Check the radiator support panel and front impact sensor for deformation or rust.
2.Check the front impact sensor for dents, cracks, deformation or rust.
3.Check the sensor harnesses for binding, the connectors for damage, and the terminals for deformation.
note The figures show front impact sensors (LH). The front impact sensors (RH) are symmetrical with the front impact sensors (LH).

SRS-ECU

1.Check the SRS-ECU for dents, cracks or deformation.
2.Check the connector for damage, and the terminals for deformation.
3.Check the SRS-ECU for installation condition.

AIR BAG MODULES

1.Check the pad cover for dents, cracks or deformation.
2.Check the connector for damage, terminals deformities, and the harness for binding.
3.Check the air bag inflator case for dents, cracks or deformities.
4.Check the air bag modules for proper installation.

FRONT SEATBACK ASSEMBLY (SIDE-AIRBAG MODULE)

1.Check the side-airbag module deployment section in the seat for dents and deformation.
2.Check the connectors for damage, the terminals for deformation, and the harness for binds.

CLOCK SPRING

1.Check the clock spring connectors and protective tube for damage, and the terminals for deformation.
2.Visually check the case for damage.

SIDE IMPACT SENSOR


1.Check the centre pillar for deformation or rust.
2.Check the side impact sensors for dents, cracks, deformation and rust.
3.Check the connector for damage and the terminals for deformation.
note The figures show side impact sensors (RH). The side impact sensors (LH) are symmetrical with the side impact sensors (RH).

SEAT BELT WITH PRE-TENSIONER
1.Check the seat belt for damage or deformation.
2.Check the seat belt with pre-tensioner for cracks or deformation.
3.Check that the unit is installed correctly to the vehicle body.

CURTAIN AIR BAG MODULES

1.Check that the curtain air bag deployment part of the headlining is normal.
2.Check the inflator surface for cracks, dents or deformations.
3.Check the air bag for breakage.
4.Check the connector for damage, the terminal for deformation and the harness for binding.

STEERING WHEEL, STEERING COLUMN AND SHAFT ASSEMBLY
1.Check the wiring harness (built into the steering wheel) and the connectors for damage, and the terminals for deformation.
2.Install the air bag module to check fit or alignment with the steering wheel.
3.Check the steering wheel for noise, binding or difficult operation and excessive free play.
4.Check the steering column shaft shock absorbing mechanism (Refer to GROUP 37, On-Vehicle Service ).

HARNESS CONNECTOR (INSTRUMENT PANEL WIRING HARNESS AND FLOOR WIRING HARNESS, ROOF WIRING HARNESS)
Check harnesses for binding, connectors for damage and terminals for deformation (Refer to ).