Hi guys i've got a W reg impreza thats developed some confusing faults !

me and my mate sorted some wiring out and there was a blue connector that we though was obsolete but i think it may of been the immobaliser now.It has 4 wires and was connected to some of the radio feeds i think... any thoughts?

when started it only lasts for around 5 seconds before dying so i immediatly though fueling issue the pump fuse and relays are all fine, to single it out i put a live feed to the fuel pump and still the same problem !!

its since we did this wiring but i though a direct feed to the pump would sort an immobaliser problem?

any suggestions/ideas very welcome

Thanks