I was looking to see if the BCM was updated at the same time (03/11) and sure enough, it was. Actually it's interesting to see how many BCM part numbers there are:
10/08 - 10/09 284B1-1EA0A
10/09 - 03/10 284B1-1EA0B
03/10 - 07/10 284B1-1ET0B
07/10 - 01/11 284B1-1ET4B
01/11 - 03/11 284B1-1ET6C
03/11 - 09/11 284B1-1EA5D
09/11 - now 284B1-1EA7D
The IPDM module changed a bunch too, but not at 03/11, so my guess would be the BCM is what got changed to not look for the steering lock...
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