That doesn't sound like the anti-theft system is at fault. What does it do if you try to start it? Does the security indicator flash? Will it start and run for a couple seconds? It sounds more like the center stack has a failure as they should light up with the key on even if the theft system is active. There is no reset button on the system and disconnecting the battery actually should cause the anti-theft to sound the alarm as soon as it gets power back.
Probably the first thing I would suggest would be to check all the fuses as a loss of power to the radio and its hardware will cause the issues you have. So, get a simple test light and check the left and right fuse boxes. The left one is under the dash above the left footwell while the right one is behind the footwell kick panel. You would be looking for fuses 1, 8, 9, 12, 13, 48 as a start. If they all test good, then it could be the radio or its related components.
https://www.2carpros.com/articles/how-to-check-a-car-fuse
As for the fob, you need a dealer or a locksmith to check it and verify it is operating and then program it into the system.
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Tuesday, January 16th, 2024 AT 1:19 PM