No crank no start after replacing battery

2002 JAGUAR X-TYPE
70,000 MILES • 2.0L • V6 • 4WD • AUTOMATIC
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R MTZ
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car was working fine until they changed the battery and now engine wont crank and says "immobilizer is not engaged", gives a code on the security light had it checked and "says antenna not receiving signal" took out the car computer, instrument cluster, key antenna and took it to a programmer they said " all was fine and communication between those was okay" so i reinstalled it and still car wont crank, car key works as it opens locks trunk etc. i have already disconnected the battery overnight and cables one to another in order to drain energy from the system with no luck.
i there a way i can by pass the immobilizer or reset it?
would very much appreciate any help.
Jul 25, 2019 at 3:05 PM
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STRAILER
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Hello,

There is no way to bypass the security in the car. can I ask if the security light is flashing? You could have had a voltage surge when the battery was replaced so we need to check the fuses. here is a guide and the fuse locations in the diagrams below:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

This guide can help as well:

https://www.2carpros.com/articles/how-to-reset-a-security-system

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.
Jul 27, 2019 at 1:10 PM