NefMoto

Technical => Cluster and Immobilizer => Topic started by: stranger on July 27, 2025, 07:36:31 AM



Title: TCU DQ381 EEPROM CHECKSUM
Post by: stranger on July 27, 2025, 07:36:31 AM
Hello. Does anyone know the algorithm for calculating checksum in the 128kb DQ381 eeprom?
Here is how CS looks like.





Title: Re: TCU DQ381 EEPROM CHECKSUM
Post by: ljscodex on September 03, 2025, 06:55:06 AM
hi, did you try with the edc17crc ? i mean crc16


Title: Re: TCU DQ381 EEPROM CHECKSUM
Post by: stranger on September 24, 2025, 02:46:06 PM
This is some kind of tricky checksum (not the standard crc16 or crc32). I know where it can be extracted from. But for this a person with good reverse engineering skills is needed :)

I assume that the algorithm for calculating checksums in Bosch DQ381 and Bosch DQ500 eeproms will be the same, because the structure of the eeprom itself in them is very similar.