![]() I assume that the security data pin/code is still stored on the EEPROM for BSI coding. This raises questions about the impact on the BSI. Does the three-connector ECU use the flash to check the security code/pin, or does it rely on the EEPROM? Does this mean that if you write a different file to the flash on any PSA three-connector ECU, the immobilizer won't work? In other words, would you need to always edit the original file when remapping? The term "three connector" suggests that the ECU has coding for immo/security stored on the EEPROM in an encoded form, which can be decoded and written to the flash if necessary. On the other hand, single-connector ECUs have their immo/security data stored directly on the EEPROM. I'm a bit confused about how the PIN is stored and used between single-connector and three-connector ECU's. Does the EEPROM contain data that is checked against the flash, acting as a checksum for the flash data? If so, this would mean that modifying the flash data without updating the corresponding EEPROM values could result in an invalid security code. According to Tihiuvek, if it's an EDC15C2 ECU with three connectors, immo removal can only be done by modifying the flash (AMD29F400BT). However, for other EDC15 ECUs with a single connector, immo removal can be achieved by modifying the EEPROM (95160 or 95P08).
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