Taking the fuse out for the radio, which also powers down the iPod integration kit, seems to do the trick. Thank you!

Not an aftermarket stereo, but there is an iPod integration kit that plugs into the back of the stock stereo.

I have been trying to update the tune on my truck for the last couple of nights. The unit seems to backup the original setting fine and then when it tries to write the new tune, it bombs and says that the write was unsuccessful and the original setting needs to be restored. Part way through the ...