Accuracy Check of Occupant Classification Sensor
ACCURACY CHECK OF OCCUPANT CLASSIFICATION SENSORCAUTION: The following precaution must be observed when executing accuracy testing and calibration.
- Eliminate the occupant classification sensor friction.
- Perform the occupant classification sensor calibration at room temperature. (Proposal: 20 ± 15° C (68 ± 27° F)) (Before the calibration, place the occupant classification sensor more than 30 minutes at room temperature.)
- Do not apply any load or vibration while the weight check and the calibration is performed.
- Perform the weight check and the calibration after seat components are all assembled.
CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
1. Connect scan tool MB991958 to the data link connector.
2. Open and close the front door (RH) 5 times firmly to remove the friction. And if the door does not open and close smoothly after the impact, hit the front and rear sides of the seatback about eight times each to remove the friction.
3. To execute accuracy check and calibration, operate scan tool MB991958 as follows.
1. Select "Interactive Diagnosis".
2. Select "Special Function".
3. Select "Seat Weight Sensor Accuracy Check".
4. For accuracy check 30 kg (66 pounds), slide the seat to the front end, and put a 30 kg (66 pounds) weight on the center of the seat cushion. Then, carry out the friction removal in step (2) and press the OK button to execute accuracy check.
NOTE: If there is not a 30 kg (66 pounds) weight, load a square object of 30 to 40 kg (66 to 88 pounds). At this time, operate the arrow button of the weight input part on M.U.T.-III to input the loaded weight value.
5. If the tolerance level between the sensor output and the input value is within 4.9 kg (11 pounds), the screen for the accuracy check completion is displayed, and if more than 4.9 kg (11 pounds), the screen for abnormal condition is displayed.
NOTE: When the screen for the accuracy check of 0 kg (0 pound) is displayed, go to step (9). If the abnormal condition is displayed, check the seat installation condition. If the seat is improperly installed, install it properly and carry out the operation in step (4) again.
6. When the abnormal condition is displayed, press the OK button and go to the calibration screen. If the cancel button is pressed the screen returns to step (4).
7. Unload the weight, check the seat installation condition and carry out the friction removal in step (2) again, and press the OK button. When the execution dialog is displayed, press the OK button again to execute the calibration.
8. The calibration has been completed when the screen as shown in the illustration is displayed. Press the OK button to return to the screen of step (4), and carry out the same procedure.
9. When the screen for the accuracy check of 0 kg (0 pound) is displayed, unload the weight and slide the seat to the rear end. Then, carry out the friction removal in step (2) and press the OK button to execute the accuracy check.
10. If the tolerance level between the sensor output and the input value is within 4.9 kg (11 pounds), the screen for the accuracy check completion is displayed, and if more than 4.9 kg (11 pounds), the screen for abnormal condition is displayed.
NOTE: If the abnormal condition is displayed, check the seat installation condition. If the seat is improperly installed, install it properly and repeat from step (4).
11. When the abnormal condition is displayed, press the OK button and go to the calibration screen. Return to step (9) when the cancel button is pressed.)
12. Check the seat installation condition and carry out the friction removal in step (2) again, and press the OK button. When the execution dialog is displayed, press the OK button again to execute the calibration.
13. The calibration has been completed when the screen as shown in the illustration is displayed. Press the OK button to return to the screen of step (4), and carry out the same procedure.
14. If the accuracy testing does not complete, an intermittent malfunction is suspected (Refer to General (Body and Chassis), How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions.