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05 STS4
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4,241 Posts
jferrin said:
Changed battery in my STS now won't start. Radio display says theft lock. Need Help
That's a 1st

Radio stores vin in memory. Unless it lost firmware dc the battery shouldn't cause a problem.

Dc the cables hold them together for a 30 count and reconnect.
 

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'11 CTS-V Coupe M6, '05 1SG STS4 V8
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377 Posts
My alarm always goes off when I reconnect the battery but I haven't had it lock me out of starting it.
 

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2006 STS V8 AWD, '95 Ford Ranger
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29,294 Posts
A clumsy reconnect can produce an arcy sparky event that the car can interpret as a theft attempt, among other things. Do the battery reset thing that BOAT talks about and see what happens. Pressing the lock button on the fob can also reset the theft system.
 
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