2015 GM BCM eeprom dump and checksum calculation

[04colyZQ8]

This is my stock 2015 trax BCM eeprom dump 24C32 can you figure out the checksum? I changed the vin and it now gives error incorrect checksum? Would it be the first 2 bytes? Also can I reset the radio vin so it doesn't say locked?

F2 EB 40 00 00 82 00 CF 6F 66 00 CF 68 C5 41 41 41 41 32 31 31 34 33 30 34 34 30 30 30 30 32 36 34 4E 50 77 D5 5F AF 88 40 00 00 00 00 00 00 00 00 FF FF FF FF FF FF FF FF 00 00 00 00 00 00 00 38 E9 40 00 AA 48 54 4D 49 4B 52 4F 4E FE DC BA 12 34 56 78 9A BC 27 D3 00 38 31 32 38 35 37 39 39 33 B2 B3 21 CC 19 D6 44 25 6F AD 5A FB 5D F2 88 C9 38 33 36 30 31 30 30 30 30 30 30 30 30 58 A8 E1 40 00 B5 B5 D6 F7 B6 5C 07 A3 B6 5C 07 A3 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 12 38 00 38 31 31 31 00 03 02 00 00 00 00 00 00 00 00 00 00 00 05 A2 C0 79 41 41 00 A3 EB 40 00 00 05 00 83 0C F1 96 4E 3D 1C 9B 35 B6 02 53 96 6D 06 2D 83 0C F1 96 4E 3D 1C 9B 35 B6 02 53 96 6D 06 2D 83 0C F1 96 4E 3D 1C 9B 35 B6 02 53 96 6D 06 2D 02 DB C9 00 07 01 FF 00 00 BD FF 40 00 01 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 D0 F7 40 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 02 DB C9 00 02 02 02 00 11 22 83 FF 70 9F 3A 4E 34 22 A1 0E 38 F0 CA 00 00 00 A5 F7 40 00 4D 2F 00 00 5C C5 00 00 1D 1F 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 83 0C F1 96 4E 3D 1C 9B 35 B6 02 53 96 6D 06 2D 19 4E 00 00 00 06 04 02 00 00 00 00 F4 F8 40 00 02 DB C9 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 33 47 4E 43 4A 52 53 42 35 46 4C 31 36 33 35 37 39 3F 06 92 0C 00 00 00 CD F8 40 00 B5 B5 D6 F7 B6 5C 07 A3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 FF 00 00 00 00 FF 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 A4 FC 40 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 A0 0A A0 0A 01 01 01 01 01 00 AC 61 B5 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 BF FF 40 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 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F9 40 00 98 16 06 51 FE 51 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 FB 93 C2 FF 00 00 00 00 00 00 00 00 02 04 00 00 00 08 07 07 06 00 06 02 00 00 00 0F 1E 00 09 0D B8 F9 40 00 AE 16 B2 51 66 52 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 21 DE DB FF 00 00 00 00 00 00 00 00 03 0F 00 00 00 13 00 14 15 17 13 00 00 12 00 1D 08 00 00 00 CE F6 40 00 04 10 88 4D 26 50 00 00 00 00 00 00 CD 31 C6 31 AC 31 00 00 00 00 00 00 00 00 00 00 21 B9 EF FF 00 00 00 00 0C 00 BF 31 0D 00 0C 2B 02 00 05 05 05 05 05 19 19 19 19 19 08 08 08 08 0C FB 40 00 08 12 12 10 10 10 06 06 0D 0A 0A 20 01 30 09 09 3B 3A 3A 23 23 19 19 19 19 19 08 08 08 08 08 12 12 10 10 10 06 06 0D 0A 0A 20 01 30 09 09 3B 3A 3A 23 23 05 04 0D 0C 0D 0C 0B 0D 01 66 FB 31 00 01 06 00 00 00 00 01 04 00 00 00 00 00 00 00 00 00 00 00 00 01 D0 85 01 01 F5 70 00 01 00 00 00 00 00 01 64 20 01 64 20 01 64 20 00 0F 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 A6 FE 40 00 00 00 00 00 00 00 00 00 00 00 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99 00 00 00 99 99 00 99 00 60 00 99 40 00 99 00 00 00 00 00 00 97 60 00 80 60 60 60 60 00 BB 00 00 00 99 80 00 64 F5 3F 00 00 00 58 58 58 60 00 58 00 00 00 00 60 80 97 97 97 00 00 97 60 00 00 3F 02 1F 01 1C 02 FF FF 9D 01 9F 01 1A 02 6D 00 B4 00 04 02 00 01 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 38 FD 3F 00 20 23 04 06 39 39 39 39 39 38 38 38 38 38 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 02 02 02 00 F6 FC 2B 00 01 01 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3C CD E2 03 8F 54 00 00 00 00 00 00 00 02 02 02 02 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 D7 FF 28 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 FF D7 00 36 00 00 86 D2 00 00 00 41 00 D8 00 80 00 C8 00 40 00 40 00 40 00 8A FE 40 FE 40 FD 82 FD 03 FE 41 FD C1 FD 41 FC FF 00 00 00 01 E2 5A 5B 00 00 00 02 00 00 00 00 00 00 00 00 00 00 00

[kur4o]

Checksums are per block.

first 2 bytes are 2`s compliment sum, next 2 bytes are length of checksum.
range starts at first byte from length

example

Code: Select all

F2 EB -checksum

40 00 - length

00 82 00 CF 6F 66 00 CF 68 C5 41 41 41 41 32 31 31 34 33 30 34 34 30 30 30 30 32 36 34 4E 50 77 D5 5F AF 88 40 00 00 00 00 00 00 00 00 FF FF FF FF FF FF FF FF 00 00 00 00 00 00 00 -data

F2 EB [40 00 00 82 00 CF 6F 66 00 CF 68 C5 41 41 41 41 32 31 31 34 33 30 34 34 30 30 30 30 32 36 34 4E 50 77 D5 5F AF 88 40 00 00 00 00 00 00 00 00 FF FF FF FF FF FF FF FF 00 00 00 00 00 00 00] range in bracket.

Data is LSB so bytes are reversed

40 00 = $0040 length

f2eb = ebf2 checksum.

[04colyZQ8]

Kuru4 looks good can’t wait to try thank you!

[04colyZQ8]

Checksums are per block.

first 2 bytes are 2`s compliment sum, next 2 bytes are length of checksum.
range starts at first byte from length

example

Code: Select all

F2 EB -checksum

40 00 - length

00 82 00 CF 6F 66 00 CF 68 C5 41 41 41 41 32 31 31 34 33 30 34 34 30 30 30 30 32 36 34 4E 50 77 D5 5F AF 88 40 00 00 00 00 00 00 00 00 FF FF FF FF FF FF FF FF 00 00 00 00 00 00 00 -data

F2 EB [40 00 00 82 00 CF 6F 66 00 CF 68 C5 41 41 41 41 32 31 31 34 33 30 34 34 30 30 30 30 32 36 34 4E 50 77 D5 5F AF 88 40 00 00 00 00 00 00 00 00 FF FF FF FF FF FF FF FF 00 00 00 00 00 00 00] range in bracket.

Data is LSB so bytes are reversed

40 00 = $0040 length

f2eb = ebf2 checksum.

You are the best...

FIY using hxd highlight the chunk 40 long minus the first two bytes. Then SUM using checksum-16. Next add 1 to it, then use windows calc to take 100000-sum, then change endianess... done! It worked and the BCM says fully programmed instead of eeprom checksum error

[gmtech825]

there's a slightly easier method. take the value hxd gives you and put it in the windows calc and use the NOT function. then swap endiness.

[04colyZQ8]

there's a slightly easier method. take the value hxd gives you and put it in the windows calc and use the NOT function. then swap endiness.

Sweet!!!!