It sounds like the security system is enabled but we should start by checking the fuse with the key on. Also, can I ask if the original key is still with the car or is there a replacement key tried to start the car?
If the fuse is okay with the original key, can I ask if the security light is flashing? If so, I would disconnect the battery overnight to help reset the system.
This guide may help as well:
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Thursday, February 1st, 2024 AT 11:51 AM