Their has to be a way to check this. It looks like the techs from Ford would know but you know how that goes.

 

I have reviewed the wiring in depth for the radio for 05 through 08 mustangs. There are no changes except the different harness for the shaker 1000.

The VSS error is in the data stream. There are a number of 07s out there with factory nav that still have the error too. The instrument cluster update fixed some of them but not all. Ford is washing its hands of the problem and leaving it broke. Nice Hugh?