I've had issues with a viper immobiliser installed on my mk7 recently (it was already installed when I bought it). The car won't start when using the immobiliser, which is then followed by the alarm. The immobiliser has worked fine in the past, so I'm wondering if the tag/fob has become faulty?
If anyone has one of these immobiliser's and could offer any advice that would be great, cheers.
Hi All.
I have a vehicle immobiliser algorithm to break and I've have gathered a full set of challenge and responses to work with - I can solve it using look-up tables but I'd like to reduce my code to the algorithm rather than the tables if possible.
For a given challenge the response is always the same.
The challenge and response are both always 32 bits.
Each byte of the challenge only ever affects one byte of the response.
I've tried a few CRC algorithms using RevEng but no luck.
In the vehicle application the "raw" response is XORd with a fixed value before the challenging module sees it...ie Challenge issued by challenging module >> Raw response returned by immobilser module >> Raw response XORd by gateway module >> challenging module receives XORd response.
Here's a few sequential C/R pairs so you can get a feel for what's going on.
Challenge >> Raw >> XORd with 0xE7C61029
0x00000000 >> 0xB52063BB >> 0x52E67392
00000001 >> B5206341 >> 52E67368
00000002 >> 89E36E1E >> 6E257E37
00000003 >> 89E3C71E >> 6E25D737
00000004 >> B52063DD >> 52E673F4
00000005 >> B520635B >> 52E67372
If anyone can see a pattern emerging or has ideas about how to solve this then please go for it and let me know! I've got a full set of C/Rs as I say (0x00000000 to 0xFFFFFFFF) so if you need more for testing then let me know.
Thanks :)
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