Transponder Lock Check

Required Special Tools: 

• MB991958: Scan Tool (MUT-III Sub Assembly)
  • MB991824: Vehicles Communication Interface (V.C.I.)
  • MB991827: MUT-III USB Cable
  • MB991911: MUT-III Main Harness B (Vehicles without CAN communication system)

Follow the procedure below to judge if the ignition key can be overwritten (i.e. the ignition key is correct) or not.

1. Connect the scan tool MB991958 to the data link connector.
2. Turn the ignition switch to "ON" position.
   Fig 1: Connecting Scan Tool MB991958 To Data Link Connector

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3. Select "Interactive Diagnosis" from the start-up screen.
   Fig 2: Identifying Select "Interactive Diagnosis" From Start-Up Screen

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4. Select "System select."
   Fig 3: Identifying Select "System select."

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5. Choose "IMMOBILIZER" from the "POWER TRAIN" tab.
   Fig 4: Identifying Choose "IMMOBILIZER" From "Power Train" Tab

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6. Select "Data List."
   Fig 5: Identifying Select "Data List."

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7. The multi-center display shows whether the ignition key, which has been inserted in the switch, can be rewritten and how many ignition keys have ever been registered.
   Fig 6: Identifying Multi-Center Display

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   Fig 7: Identifying Ignition Key Status Table

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