WIKI

By selecting function “Teach keys” for vehicle model Cayenne (-2010) the user can learn transponder key for vehicle model Porsche Cayenne.

When “Next” is pressed the following window appears requiring from user to input the 4 digit immobilizer (Login) code.

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The immobilizer (Login) code can be read from ECU by OBDII (for Bosch Gasoline EUCs) or from configuration data dump of the Kessy module using special function “Dump tool”.

Next screen requires the key count that will be taught (a number 1 to 4).

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By pressing “Next” key learning procedure begins.


3.4.5.4 Program dealer key – Cayenne (-2010)

For vehicles with HITAG2 key/transponder year model 2004-2007 you must use virgin transponder PCF7936 or virgin key.

If you use a Transponder - you need to switch it in Cipher (“Crypto”) mode.

You can use your Key programmer HiTag2 programmer for that purpose if you have one. This is done by replacing 0x06 with 0x0E in the first byte of the configuration page (Configuration page is page 3 where page 0 is the transponder ID, and pages 1 and 2 are the secret key).

If this value is already 0x0E then the transponder is already in cipher mode.

For vehicles with HITAG2 key/transponder year model 2007+ you need to prepare the HITAG2 key/transponder for to use it.

This can be done using function “Program dealer key”.

After this function is selected and “Next” button is pressed the following window appears

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There are following possibilities

The “Autodetect from ECU” button will try automatically to read the component security bytes from the ECU, and will select for you automatically whether you need to search for the 7th byte or not.

IMPORTANT: If you don’t have a working key from the car, you will need to short the fuses as described in the appendix to get communication with the ECU.

After the component security is read, if you’ve all 7 bytes, then you can program the key directly. If you have only the 6 bytes, you have to choose:

a) if you have working key from this car, you can put it into the programmer, and press the “Find 7th byte from working key” - the 7th byte will be found in several seconds;

NOTE: If you use the Tango programmer this function will not work, the function work only on Hitag2 or Abrites key programmer.

b) if you don’t have a working key, you’ve to search manually for the 7th byte. The procedure takes approximately about 20-25 min, but can rise to 45min in the worst case. You’ve to connect the interface to the OBDII, and the programmer should be connected too. Then after pressing the “Program” button you will receive notification when to put the key into the ignition, and when to put it into the programmer.

IMPORTANT: You need only to put the key inside , please DO NOT ROTATE THE KEY.

IMPORTANT: You may hold the programmer near the ignition lock so you can proceed faster when you remove the key. But please pay attention that the programmer is at least 15cm from the ignition lock so the reading of the key from the car is not disturbed.

NOTE: It is always better to use a plastic key or an empty transponder when you search for the 7th byte, at least when you prepare such keys for the first time. If by some reason the key becomes locked (e.g. battery goes down, computer is hang-up, etc.), you can find the encryption-key with the “Find 7th byte from working key” button, and then you can restore the key with the Hitag2 key tool.

You can load a dump of the Kessy or ECU using the “Load component protection from Kessy/ECU dump” radio-button. After pressing the “Load dump”button you’ve to select the respective dump file, after that the “Program” button will be active.

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NOTE: Please pay attention that in the ECU dump sometimes there are only 6 of the component security bytes. In this case you will need to search for the 7th byte.

NOTE: Please pay attention that if you have the Kessy dump, then you will have all the 7 bytes. But there are a lot of Kessy devices with different software versions, so it is possible that the configuration data is incorrect decrypted, respectively the component security bytes will be wrong. In this case the key will not work and you will need to restore the key using the Hitag2 programmer.

It is possible that by some reason the Autodetect button is not functioning, e.g. missing license, you don’t make the short with the fuses properly, ECU is missing or is broken, and so on.

If you’ve already read the component security bytes previously (e.g. by dissoldering the ECU EEPROM and decoding it by dump tool), then you can put the component security bytes manually and proceed as described in step 2.1

After you have a key/transponder ready for learning you have to specify how many keys you would like to learn and the security access code of the kessy module into the “Key learning Porsche Cayenne” window. Press button “Learn” for to start the learning procedure.