When you go into anti theft mode from
changing a battery can you reprogram the
original key if there seems to be no damage?
You may just need to reset the security system.
Try this, from the inside manually lock all the doors but the drivers, then with keys in hand exit the vehicle close and using the key manually lock the drivers door, watch the dome light and when it goes out wait at least a minute, then using the key unlock the drivers door, then check to see if the security system is disarmed. If that doesn't work then the programming has been corrupted by not following proper battery replacement procedure and will have to be reprogrammed at the dealer. There is a little tool called a preset saver, it uses a 9 volt battery and it plugs into an active power port on the vehicle, this prevents loss of all programming in your vehicle. On later models it can save you a hundred dollar reflash bill at the dealership. I have a fancier version that plugs right into,the OBD 2 port and uses a jump box or another 12 volt battery as a power source, it really extends the down time if the repairs to the vehicle are going to take a long time with main power disconnected. HTH
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