More than likely you have an issue in the body controller but here are a few guides that talk about this issue in a little more detail and provide so basic info on how to disable the system:
https://www.2carpros.com/articles/how-to-reset-a-security-system
https://www.2carpros.com/articles/everything-goes-dead-when-engine-is-cranked
If this all started after a battery replacement then when this theft light is on, we need to interrogate the BCM to find out if the hood ajar switch is faulty or something else along these lines.
We don't have a manual on this specific vehicle as it is not offered here in the USA but this is similar to a Chevrolet version that we do have here so I am providing the wiring diagrams for this below.
Please run through this material and let us know if you have questions.
Thanks
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Wednesday, August 4th, 2021 AT 11:07 AM