| Self-diagnosis of the 1st generation immobiliser |
| The electronic immobiliser consists of: |
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| an immobiliser control unit |
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| an adapted engine control unit |
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| a warning light in the dash panel insert |
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| a reader coil on the ignition lock |
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| adapted ignition keys with electronic circuit (transponder) |
| The electronic immobiliser control unit is integrated in the dash panel insert, this means that the dash panel insert must be replaced if the control unit is defective. |
| The immobiliser intervenes in the engine control via an adapted engine control unit. |
| The immobiliser reader coil reads out the response code of the transponder each time after switching the ignition on. |
| The warning light briefly lights up when using an authorised vehicle key. |
| If an unauthorised vehicle key is used or in the event of a system fault, the warning light flashes continuously with the ignition "On". |
| The electronic immobiliser features a comprehensive self-diagnosis. If faults occur in the system components, fault codes are stored in the fault memory of the control unit. The faults can be detected with the vehicle system tester -V.A.G 1552-, -V.A.G 1551- or - V.A.S 5051-. |
Note | The following description only relates to the vehicle system tester -V.A.G 1552-. The use of the fault read-out scan tool -V.A.G 1551- is similar except for specific deviations (e.g. different readouts in display, possibility of using a printer etc.). |
| Notes for use or adaptation of the vehicle key |
| The engine only starts when using an authorised vehicle key, this means a vehicle key adapted to an immobiliser control unit. |
| When adapting the vehicle keys → Chapter all of the vehicle keys, as well as the spare keys, must be adapted to the immobiliser control unit. |
| If new or additional vehicle keys are required, carry out the adaptation of the vehicle keys. |
| If for certain reasons, it is not possible to adapt all of the vehicle keys, e.g. keys are lost during a journey, the customer must be informed that an adaptation of all the vehicle keys must subsequently be carried out. |
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