Seat Occupant Classification Module - Air Bag: Testing and Inspection

Operation Check of the Front Passenger's Weight Sensor Unit

The operation of the front passenger's weight sensor unit must be checked after any of these actions:
- Replacement of front passenger's seat component(s) (except weight sensor unit and/or weight sensors)
- After a vehicle collision

NOTE: If the front passenger's weight sensor and/or weight sensor unit was replaced, do not use this procedure. Go to Calibrating the Front Passenger's Weight Sensor Unit.

When doing the operation check, observe these precautions:
- Make sure all components of the front passenger's seat are correctly installed.
- Make sure all optional parts such as seat covers are removed.

1. Position the front passenger's seat to the rearmost position, adjust the seat height to the lowest position, and adjust the recliner to the most forward position. Do not move the seat from these positions.
- Make sure nothing is on or under the front passenger's seat.
- Make sure there is nothing in the front passenger's seat-back pocket.
- Keep the windows closed.
- Perform all calibration procedures except test driving in the service bay.
- Make sure the vehicle is on level ground.
- Keep the A/C and the heater off.
- Do not touch the front passenger's seat until you drive the vehicle.
- Do not expose the front passenger's seat to sudden temperature changes.

After Replacing Front Passenger's Seat Component(s)




2. Connect the HDS to the DLC (A).
3. Drive the vehicle, accelerate to 20 mph (36 km/h), then stop on level ground.
4. From the Main Menu, select SRS, then Misc Test, then Inspection. In the HDS Inspection Menu, select "SEAT OUTPUT CHK." The weight (T0) of the front passenger's seat is displayed by the HDS. Write this measurement down as "T0" on a piece of paper.
- If the reading on the tester (T0) is ±6.6 lbs (±3.0 kg), or less, go to step 5.
- If the reading on the tester (T0) is more than ±6.6 lbs (±3.0 kg), turn the ignition switch OFF, and go to step 1 of "Calibrating the Front Passenger's Weight Sensor Unit."

5. Prepare a 55 to 77 lbs (25 to 35 kg) weight, then measure and note its actual weight (M) on a scale.

NOTE: The accuracy of the scale must be within ±2.2 lbs (1 kg).

6. Place the prepared weight on the front passenger's seat.
7. Drive the vehicle, and accelerate to 20 mph (36 km/h), then stop on level ground.
8. From the HDS Main Menu, select SRS, then Misc Test, then Inspection. In the HDS Inspection Menu, select "SEAT OUTPUT CHK." The weight (T1) of the front passenger's seat is displayed by the HDS. Write this measurement down as "T1."
9. Calculate the variance between the weight measured on the scale and the HDS with the formula.

Variance = ((T1)-(T0)-(M1)<±8.6 lbs (3.9 kg)

T1: Weight measured by the HDS with the weight on the seat
TO: Weight measured by the HDS with no load on the seat
M1: Weight measured on the scale

- If the variance is ±8.6 lbs (±3.9 kg) or less, the check is complete. Go to step 10.
- If the variance is more than ±8.6 lbs (±3.9 kg), remove the front passenger's weight sensors, reinstall them, then repeat this procedure from the beginning.
- If after reinstalling the front passenger's weight sensors, the variance is still more than ±8.6 lbs (±3.9 kg), replace the front passenger's weight sensors (if they were not replaced).

10. Turn the ignition switch OFF, and disconnect the HDS from the DLC.

After a Vehicle Collision

11. Position the front passenger's seat to the rear most position, adjust the recliner to the most forward position. Do not move it from these positions.




12. Connect the HDS to the DLC (A).
13. Drive the vehicle, accelerate to 20 mph (36 km/h), then stop on level ground.
14. From the HDS inspection menu, select "SEAT OUTPUT CHK." The weight (T0) of the front passenger's seat is displayed by the HDS. Write this measurement down as "T0" on a piece of paper.
- If the reading on the HDS (T0) is ±6.6 lbs (±3.0 kg) or less, go to step 15.
- If the reading on the HDS (T0) is more than ±6.6 lbs (±3.0 kg), remove the front passenger's weight sensors, reinstall them, then repeat steps 11 through 13.
- If after reinstalling the front passenger's seat weight sensors, the reading on the HDS (T0) is still more than ±6.6 lbs (±3.0 kg), go to step 1 of "Calibrating the Front Passenger's Weight Sensor Unit."

15. Prepare a 55 to 77 lbs (25 to 35 kg) weight, then measure and note its actual weight (M) on a scale.

NOTE: The accuracy of the scale must be within ±2.2 lbs (1 kg).

16. Place the prepared weight on the front passenger's seat.
17. Drive the vehicle, and accelerate to 20 mph (36 km/h), then stop on level ground.
18. From the HDS Main Menu, select SRS, then Misc Test, then Inspection. In the HDS Inspection Menu, select "SEAT OUTPUT CHK." The weight (T1) of the front passenger's seat is displayed by the HDS. Write this measurement down as "T1."
19. Calculate the variance between the weight measured on the scale and the HDS with the formula.

Variance = ((T1)-(T0)-(M1))<±8.6 lbs (3.9 kg)

T1: Weight measured by the HDS with the weight on the seat
T0: Weight measured by the HDS with no load on the seat
M1: Weight measured on the scale

- If the variance is ±8.6 lbs (±3.9 kg) or less, the check is complete. Go to step 20.
- If the variance is more than ±8.6 lbs (±3.9 kg), remove the front passenger's weight sensors, and reinstall them, then repeat this procedure from the beginning.
- If after reinstalling the front passenger's seat weight sensors, the variance still more than ±8.6 lbs (±3.9 kg), replace the front passenger's weight sensors and the seat riser, then go to steps 1 of "Calibrating the Front Passenger's Weight Sensor Unit."

20. Turn the ignition switch OFF, and disconnect the HDS from the DLC.