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 A

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.
3. Select "Interactive Diagnosis" from the start-up screen.
   Fig 1: Connecting Scan Tool To Data Link Connector

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4. Select "System select."
   Fig 2: Identifying Function Select Menu Display

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5. Choose "IMMOBILIZER" from the "POWER TRAIN" tab.
   Fig 3: Identifying System Select Menu Display

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6. Select "Data List."
   Fig 4: Identifying IMMOBILIZER Display

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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.
   IGNITION KEY REFERENCE
   
   

   TP LOCK CHECK	IGNITION KEY:	JUDGMENT OF IGNITION KEY
   UNLOCK	Can be overwritten	Correct
   LOCK	Can not be overwritten	Incorrect

   Fig 5: Identifying Data List Display

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