| Immobilizer self-diagnosis |
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| In Germany the “online request with GeKo-VW” replaces the request of the 7 character PIN as of 01.07.2004. |
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| In other countries the “online request” replaces the request of the 7 character PIN as of 01.10.2004. |
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| Immobilizer self-diagnosis is now only possible with vehicle diagnosis, testing and information system -VAS 5051 A- or the vehicle diagnosis and service information system -VAS 5052-. |
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| Not all self-diagnosis functions are possible due to the change-over to “online request with GeKo-VW”. |
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| The functions which are no longer possible are replaced by the programs in “guided functions” → Chapter. |
| Up to 08.97: a first generation immobilizer is installed in the Polo. |
| Communications between the immobilizer control unit and the engine control unit take place on the W-wire. |
| From 09.97 to 05.00: a second generation immobilizer is installed in the Polo. |
| Communications between the immobilizer control unit and the engine control unit take place on the W-wire. |
| From 10.99: a third generation immobilizer is installed in the Polo. |
| Depending on engine fitted there are two different versions installed. |
| On one version the immobilizer control unit and engine control unit communicate with one another via the data bus, on the other versions this communication is via the W-wire. |
| The corresponding communication method should be determined beforehand using the display group 001 → Anchor via the Read data block function → Chapter. |
| Communications are implemented via the W-wire if the first display zone contains the Baud rate in the form of a number. |
| On the other hand the text “data bus” means communication via the data bus. |
| The immobilizer electronics consist of: |
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| An immobilizer control unit. |
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| An adapted (matched) engine control unit. |
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| A reader coil on ignition lock. |
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| And adapted (matched) ignition keys with electronic components (transponder and response reader memory). |
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