When I fitted peps, I couldn't turn the ignition on but there is a way with tech 2 by going into the peps unit entering the security code then it would allow me to use the start button to turn it on and program the van. This is assuming that the units are ok.
Does anything work on the car, interior lights etc?
I'd go back to basics and check to see if there is power at each unit and that the earths are good.
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