Transponder Lock Check

Required Special Tools: 

• MB991958: Scan Tool (MUT-III Sub Assembly)
  • MB991824: Vehicle Communication Interface (V.C.I.)
  • MB991827: MUT-III USB Cable
  • MB991910: MUT-III Main Harness A (Vehicles with 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.
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: Scan Tool Display - System select

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5. Choose "IMMOBILIZER" from the "POWER TRAIN" tab.
   Fig 3: Scan Tool Display - POWER TRAIN

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6. Select "Data List."
   Fig 4: Scan Tool Display - 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 5: Scan Tool Display - Data List

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   IGNITION KEY JUDGMENT
   
   

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