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 Scan Tool To Data Link Connector
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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.

Fig 2: Hitting Front And Rear Sides Of Seatback
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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".
  
  Fig 3: Scan Tool Display - Special Function
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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 MUT-III to input the loaded weight value.
  
  Fig 4: Placing Weight On Center Of Seat Cushion
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  
  Fig 5: Scan Tool Display - Accuracy Check (Step 1)
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  
  Fig 6: Scan Tool Display - Accuracy Check (Executing)
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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: Display - Special Function
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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: Scan Tool Display - Abnormal Condition
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  
  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: Display - Zero-Calibration
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  
  Fig 11: Display - Special Function
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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: Display - Zero-Calibration
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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: Display - Special Function
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  
  Fig 14: Scan Tool Display - Accuracy Check (Executing)
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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.
  
  Fig 15: Scan Tool Display - Accuracy Check Results
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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 16: Scan Tool Display - Seat Weight Sensor Accuracy Check Completed Screen
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  
  Fig 17: Scan Tool Display - Abnormal Condition
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  
  Fig 18: Scan Tool Display - Zero-Calibration Screen
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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: Display - Zero-Calibration
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  
  Fig 20: Display - Special Function
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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: Display - Zero-Calibration
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
If the accuracy testing does not complete, an intermittent malfunction is suspected (Refer to How to Use Troubleshooting/Inspection Service Points - HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ).