hi ya peeps newbie here. ive started a new job and got a doblo as a work van. we have 2 of them as work vans and the other one is being sold. today i had to clear the other doblo out and i decided to take the JVC KD-G722 head unit out of the spare van we are selling and swap it with the standard unit from my van. well the JVC was working fine in the spare van and i swapped it over and now if the radio is connected in my van the van will not start (turns but no fire, like its immobilissed? the fuel gauge then goes down to zero with light on(even tho full tank) and the amber light that has a picture of the van and a padlock illuminates) if i disconnect the headunit the van will fire???? also with the headunit connected it doesnt switch on at all? if i press the mode bnutton the clock will appear on the radio for 5 seconds then go off? if i put the standard radio back in it works fine? if i put the standard radio in the spre van that works fine? but if i put the JVc back in the spare van it wont work and do exactly the same as its doing in my van? it worked fine before though? is there some sort of code ive got to break/bypass for it to work in the van?