Accuracy Check Of Occupant Classification Sensor

CAUTION: 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.

Connect scan tool MB991958 to the data link connector.

Fig 1: Connecting Special Tool MB991910 To Data Link Connector
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Open and close the front door (RH) 5 times hardly to remove the friction. And if the door does not open and close smoothly after the impact, hit the front and rear sides of seatback about eight times each to remove the friction.

Fig 2: Removing Friction
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To execute accuracy check and calibration, operate scan tool MB991958 (MUT-III Sub Assembly) as follows.
1. Select "Interactive Diagnosis".
2. Select "Special Function".
3. Select "Seat Weight Sensor Accuracy Check".
  
  Fig 3: Identifying Scan Tool Display - Seat Weight Sensor Accuracy Check
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4. For accuracy check 30 kg (66 pounds), slide the seat to the front end, and put the 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 the 30 kg (66 pounds) weight, load a square thing of 30 to 40 kg (66 to 88 pounds) instead of the weight. At this time, operate the arrow button of weight input part on MUT-III to input the loaded weight value.
  
  Fig 4: Putting 30 Kg (66 Pounds) Weight On Center Of Seat Cushion
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  Fig 5: Identifying Scan Tool Display (1 Of 2)
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  Fig 6: Identifying Scan Tool Display (2 Of 2)
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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.
  
  Fig 7: Identifying Scan Tool Display - Special Function
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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).
  
  Fig 8: Identifying Scan Tool Display - Accuracy Check
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  Fig 9: Identifying Scan Tool Display - Special Function
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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.
  
  Fig 10: Identifying Scan Tool Display (1 Of 2)
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  Fig 11: Identifying Scan Tool Display (2 Of 2)
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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.
  
  Fig 12: Identifying Scan Tool Display - Calibration
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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.
  
  Fig 13: Identifying Scan Tool Display - Special Function (1 Of 2)
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  Fig 14: Identifying Scan Tool Display - Special Function (2 Of 2)
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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.)
  
  Fig 15: Identifying Scan Tool Display (1 Of 4)
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  Fig 16: Identifying Scan Tool Display (2 Of 4)
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  Fig 17: Identifying Scan Tool Display (3 Of 4)
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  Fig 18: Identifying Scan Tool Display (4 Of 4)
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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.
  
  Fig 19: Identifying Scan Tool Display - Calibration
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  Fig 20: Identifying Scan Tool Display - Special Function
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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.
Fig 21: Identifying Scan Tool Display - Calibration
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If the accuracy testing does not complete, an intermittent malfunction is suspected. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)