the first step here is to check the fuses, first you are through them then ECU will tell itself if its fried or not, probably not and max job would be to replace diodes on it. If not passo ECU is common and must be around 7-8k
You do not need a running car to jump start another car. Get a good quality charged battery and mak connections or simply install it in car. I think passo has main fuse links in the +ve terminal of battery cover, they are the first one to fry. Check them.
