Reset anti theft after replacing Battery

Hello,

I would disconnect the battery (negative) and touch the the cable to the positive battery terminal for one minute, forcing a hard reboot of the system by discharging the system capacitors. Here is a guide that will help as well:

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

Please run down this guide and report back.

Thanks Ken!
I tried your suggestion but had no luck. It did not work. Any other suggestions?

When you try to crank the engine over does the security light flash?

No.

If the Security is Armed and I put the Master Key in the Ignition Switch, the security light goes off indicating that it is disarmed. Still, the ignition will turn on but you can not start (crank or turn over) the engine. No Light Flashes when you do that.

If the Security is Disarmed, there is no security light on or flashing; and when I put the Master Key in the Ignition Switch, no security light goes on, indicating that it is disarmed. Still, the ignition will turn on but you can not start (crank or turn over) the engine. No Light Flashes when you do that either.

Great, then the security system sounds like it is working and disarmed. can I ask if the cables or a jump to the battery?backwards?

Yes, the security system appears to be working.

No, the battery cables were not placed backwards. I was very careful about that and made sure it was installed correctly.

However, when i brought the old battery in to exchange it for a new one (as a core), i asked the technician to test both the new and old battery. Obviously the new battery was okay but when we tested the old battery, the polarity of the old battery was reversed. The positive became the negative and the negative became the positive. The tester kept on saying the cables were connected wrongly, even though they were not - positive to positive and negative to negative. When we reversed the connection - positive to negative and negative to positive, the tester worked. From that result, we can conclude that the polarity of the battery was reversed. How?, i do not know!

I hope this information helps and thank you for not giving up on this case yet? I am still doing some research too and still waiting for someone to come up with a working solution.

Thank you again for your help.

Does the engine crank and not start or not crank over (starter working)?

The engine does not crank over.
I know the starter is working.

Okay, lets run the codes to see what kind of failure the system is having. Also is the security light flashing when you turn the key to crank still? Here is a guide:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please run down this guide and report back.

The OBD2 Port is also locked out.

I had tried plugging in the OBD2 code reader but it too is locked out.

What I mean by locked out is when you plug in the OBD2, it does not connect at all. It does not light up or read anything. It is dead.

The OBD2 Port was also affected when the Anti Theft engaged.

There is an OBD fuse in the fuse panel inside the car. here is a guide so you an check it for power:

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

Check out the diagrams (below). Please let us know what happens.