Scorpion 1218 alarm dead - alapppy

I bought an MX5 that has the above alarm fitted It has been fine for about a year but on Saturday it simply went dead. I replaced the fob batteries( and re set them) still nothing

As a last resort I removed the main unit and joined the ignition wires to start the car.

Has anyone had any experience with this is the main unit a write off or any other suggestions



Value my car