Audi Workshop Service and Repair Manuals

In the event of simultaneous destruction of dash panel insert and engine control unit (caused for example by overvoltage) and if immobilizer identification number can no longer be read out, all vehicle keys must additionally be changed on replacing dash panel insert and engine control unit.

Reason: The old keys are blocked following adaption to immobilizer and cannot be matched to any other immobilizer.

The immobilizer in the new dash panel insert contains a different arithmetic rule for the variable code. This new rule is written on adaption into the engine control unit and at the same time into the transponder of the new vehicle keys. The keys are then blocked.

Note:

Replacement of all vehicle keys is not necessary if immobilizer identification number can still be read out of one of the control units to be replaced. Control units are then to be replaced consecutively.

Requirements:

• ● Vehicle diagnostic, testing and information system VAS 5051 connected up and vehicle self-diagnosis selected
• ● Ignition on

Sequence of operations

• ‒ Start immobilizer self-diagnosis => Page 01-358.

→ Display on VAS 5051:

• ‒ From list -1- select diagnosis function "Vehicle ident no.".

• ‒ Touch key
  "Press here to display entry keypad".

• ‒ Use keypad to enter 17-position vehicle identification number.
• ‒ Touch ▸ key.

• ‒ Wait until next display appears or (in the event of incorrect characters) heed instructions regarding correct entry.

• ‒ The 17 positions in the vehicle identification number are transferred one at a time to the vehicle system. Wait for completion of this program stage.

• ‒ Check entry and then touch "Yes" key.
• ‒ Incorrect vehicle ident. no. entry can be corrected by touching "No" key.

• ‒ Touch "Ready" key.

• ‒ Then perform matching for all vehicle keys => Page 01-379.

This completes adaption/matching of dash panel insert, engine control unit and vehicle keys and vehicle can be started.