So I bought this electric wheelchair for a project I'm doing (a tank, posted here for advice previously) and after replacing the dead batteries, the thing powers on like a charm.

However, it won't drive. Going off the control panel saying there's no speed on the speed indicator, I'm thinking it's been immobilised , so the thing will not budge through the controls. The power box gives off a loud 'click' sound when the joystick is moved too, as to prevent the motors from powering.

Video of it here: https://a.pomf.cat/butebt.webm

I was hoping of finding a method to deactivate the immobiliser lock and use it freely. Any ideas? I'm going to attempt and find an actual immobiliser key but if I can do it DIY, it'd be a lot cheaper.