| My understanding from talking to Charly, and reading the FSM, is that new ECUs have the flash memory cleared; that is set to all ones. In this condition any transponder key can programmed into the memory. I believe that each key emits some sort of unique code that is picked up by a little coil behing the ignition lock. Programming consists of storing this unique code in the ECU flash memory so that it remembers that particular code. Then, when a key is inserted for use, the ECU compares the code from the key to see if that code has been stored. If it has the starting sequence is enabled, otherwise starting is not allowed. Up to seven master keys, and three valet keys can be stored.
When the ECU is new, or cleared by someone like Charley, no master key is needed for programming. |