| With the “immobilizer III”, the keys are marked with a -W-. |
| As with the “immobilizer II”, the code is made up of a fixed code and a variable code component. |
| Components of the “immobilizer III”: |
| 1 - | Matched immobilizer control unit |
| 2 - | Immobilizer warning lamp -K115- in dash panel insert |
| 3 - | Reader coil at ignition lock |
| 4 - | Matched engine control unit |
| 5 - | Matched ignition keys with electronics (transponder) |
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| The electronic immobilizer control unit is integrated into the dash panel insert, i.e. the dash panel insert must be replaced if the control unit is defective. |
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| The immobilizer is a system designed to release/disable the engine control unit by way of the drive system data bus. |
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| The transponder code consists of a fixed code and a variable code. This changes each time the engine is started and thus prevents copying of the transponder. |
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| There is a different arithmetic rule for the variable code of each immobilizer. This remains the same over the entire service life. When matching the vehicle keys, the immobilizer writes this arithmetic rule into the key transponder and at the same time learns the corresponding transponder fixed code. |
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| The fixed code identifies each individual key, thus making it possible to disable a lost key. Each time the ignition is switched on, the immobilizer reader coil reads out the transponder fixed code of the key and then the variable code and checks whether the key concerned is authorised to start the vehicle. |
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| The immobilizer warning lamp -K115- lights briefly (max. 3 seconds) and then goes out if an authorised vehicle key is being used. |
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| If use is made of an unauthorised vehicle key or if there is a fault in the system, the immobilizer warning lamp -K115- flashes continuously with the ignition switched on. |
Note | Immobilizer self-diagnosis can now only be performed using the vehicle diagnostic, testing and information system -VAS 5051B-. |
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| For security reasons, the immobilizer PIN is encoded. The encoded number (PIN = Personal Identification Number) is made up of 7 digits. It must be obtained by way of the appropriate regional sales centre/importer on the basis of the 14-digit immobilizer/engine control unit identification number → Chapter. |
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| The PIN can only be used in combination with the vehicle diagnostic, testing and information system -VAS 5051B-. |
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| Check the data of your vehicle diagnostic, testing and information system -VAS 5051B- with regard to the sales centre/importer and workshop code, as well as date and time. |
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| Immobilizer adaption cannot be implemented if the data are incorrect. |
| Notes on using/matching vehicle keys |
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| The engine will only start if use is made of an authorised vehicle key, i.e. a vehicle key matched to the immobilizer. |
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| The matching procedure → Chapter involves matching all vehicle keys, including spare and emergency keys, to the immobilizer. |
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| If new or additional vehicle keys are required, all vehicle keys must again be matched to the immobilizer. |
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| If for some reason matching cannot be performed for all vehicle keys, e.g. due to loss of keys on a journey, customers are to be informed that subsequent matching of all vehicle keys is required. |
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| Re-matching of the remaining vehicle keys is particularly important if a key has been lost, as the lost vehicle key is then no longer authorised to start the vehicle. |
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