Key Matching with Immobilizer III
Posted  30 Oct. 2002

Ross-Tech is not responsible for any damage or problems that may result from following these instructions. They are to be used at your own risk.

This procedure details how to match new keys to Immobilizer-equipped VW/Audi vehicles with Immobilizer III (2002+ Golf. Jetta, New Beetle, Passat). As of 11 Mar. 2002, VW and Audi are providing 7-digit Secret Key Codes in place of the earlier 4-digit SKC's. Keys must be coded using the new 7-digit SKC (secret key code) method unless the owner still has the correct 4-digit code.

Immo-3 knows your car's VIN. Access 17-Instruments (or separate 25-Immobilizer on vehicles that are set up that way) and look at the first "Extra" field.

If you see something like: "Immo-ID VWZ7Z0W0648696"  You've got Immo-2 (or maybe even Immo-1 in earlier non-US models).

If you see something like "WVZKB58001H231169 VWZ7Z0W0648696" You've got
Immo-3. The first 17-digit string is the VIN. The second 14-digit string in the Immo-ID.

Procedure for matching keys to vehicles with Immobilizer III in the Instrument Cluster:

1. [Select] 
   [17 - Instruments]
   Write down the 14 digit Immobilizer ID number from the "Extra" field
    

2. Take that ID number to your dealer and request your seven-digit SKC, along with the workshop code and importer number (all this information can be found in the upper-right corner of the Administration screen of the dealer's VAS 5051).
    

3. Measure the car's battery voltage, it must be 12.5 V or higher.
    

4. You can check to make sure a key has the correct electronics in it so that it can be matched to the Immobilizer by:
   [Select] 
   [17 - Instruments]
   [Meas. Blocks - 08]
   Group 022
   [Go!]
   The value in field 3 must be 1. If value is not 1, the key is not capable of being adapted to Immobilizer. You can check each key in this manner.
    

5. [Select] 
   [17 - Instruments]
   [Meas. Blocks - 08]
   Group 024
   [Go!]
   Any numbers displayed in fields 1-4 represent the time in minutes that must be counted down before the Immobilizer is unlocked. If the fields are all zero, skip to step 6. If the Immobilizer is locked:
   [Done, Go Back]
   [Close Controller, Go Back - 06]
   Do not switch off the ignition! Allow the car to sit for AT LEAST the number of minutes that were indicated by the display in Group 024
    

6. [Select] 
   [17 - Instruments]
   [Meas. Blocks - 08]
   Group 024
   [Go!]
   Make sure all fields are zero.
   [Done, Go Back]
    

7. [Login - 11]
   [Use 7-digit PIN/SKC]
   Enter the 7-digit PIN, Date on which the PIN was generated by the dealer, along with the Workshop Code (WSC) and the Importer number of the dealer that generated the code.
   [OK]
    

8. VAG-COM will validate the data you have entered and return you to the Login screen, where the Login Code will show as "XXXXX".
   [Do It!]
    

9. [Adaptation - 10]
   Enter 21 in "Channel Number"
   [Read]
   The "Stored Value" is the number of keys currently matched.
   Enter "new value" of 0
   [Save]
   This clears out the old key-matchings.
   Enter a "new value" corresponding to the total number of keys to be matched,  including any existing keys
   [Save]
    

10. [Done, Go Back]
    [Close Controller, Go Back - 06]
    Switch ignition off and remove key
     

11. Insert next key to ignition and switch ignition on again
    The warning light for the Immobilizer will light up for ~2 seconds, then go out
    Switch ignition off and remove key
     

12. Repeat step 11 with each key until all keys have been matched.