Component Tests and General Diagnostics

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 rear most position, adjust the seat height to the lowest position, and adjust the recliner to the most forward position. Do not move 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/hr), then stop on level ground.
4. From the Main Menu, select SRS, then Misc Test, then Inspection. Select "SEAT OUTPUT CHK." in the tester's Inspection Menu. The weight (T0) of the front passenger's seat is displayed by the HDS. Write this measurement down as "TO" 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 weight between 55 to 77 lbs (25 to 35 kg), then measure and note its actual weight (M) with a weight scale.

NOTE: The accuracy of weight 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/hr), then stop on level ground.
8. From the tester's Main Menu, select SRS, then Misc Test, then Inspection. Select "SEAT OUTPUT CHK." in the tester's Inspection Menu. 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 by the weight scale and the tester with the formula.

Variance ((T1) - (T0) - (M1)) < ± 18.6 lbs (3.9 kg)

T1: Weight measured by the tester with the weight on the seat.
T0: Weight measured by the tester with no load on the seat.
M1: Weight measured by the weight 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 seat weight sensors, reinstall them, then repeat this procedure from the beginning.
- If after reinstalling the front passenger's seat weight sensors, the variance is still more than ± 8.8 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 from these positions.




12. Connect the HDS to the DLC (A).
13. Drive the vehicle, accelerate to 20 mph (36 km/hr), then stop on level ground.
14. From the tester's 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 15.
- If the reading on the tester (T0) is more than ± 6.6 lbs (± 3.0 kg), remove the seat weight sensors, reinstall them, then repeat steps 11 through 13.
- If after reinstalling the front passenger's seat weight sensors, the reading on the tester (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 weight between 55 to 77 lbs (25 to 35 kg), then measure and note its actual weight (M) with a weight scale.

NOTE: The accuracy of weight scale must be within 12.2 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/hr), then stop on level ground.
18. From the tester's 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 by the weight scale and the tester with the formula.

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

T1: Weight measured by the tester with the weight on the seat.
T0: Weight measured by the tester with no load on the seat.
M1: Weight measured by the weight 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 seat 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

Operation Check of the Driver's Seat Position Sensor
The driver's seat position sensor must be checked after any of these actions.
- Driver's seat position sensor replacement
- Cover plate (front side of driver's seat slide rail) replacement

1. Make sure the driver's seat is at its full forward position.
2. Make sure the ignition switch is OFF.




3. Connect the HDS to the DLC (A).
4. Turn the ignition switch ON (II).
5. From the tester's Main Menu, select SRS, then Data List, then All Data List. Select Seat Position Sensor (SPS) in the All Data.
6. Move the seat all the way forward. Using a piece of tape, mark a line on the seat's outer cover where the front riser cover meets the seat riser. The SPS should read "NEAR".

NOTE: It takes a few seconds for the tester to display changes, so wait about 5 seconds between each move.

Move the seat back in small increments (about 5 mm) until the SPS reads "NOT NEAR." The seat should be approximately 25 mm from the front.

If the SPS data does not work as described above, check the driver's seat position sensor or the cover plate for damage, and replace parts as needed.

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