Suzuki Vitara SWB - Immobilizer problems - f m s

I have a 1.6 litre old style vitara with a factory fitted immobilizer that cuts in randomly and leaves me stranded.I want to remove it but cant find a wiring diagram of this system.Can anyone help?the car is a 1995 8 valve petrol with a mitsubishi ECU.

Thanks in advance,

Simon.