Where is the ecm and ignition switch located on my 2000 Blazer ls. I've replaced the fuel pump and checked fuses. We jumped fuse box without relay for direct power to fuel pump and I tried the key thing letting it stay in on position for 10 min. Still nothing. I want to check ecm and ignition switch but do not know where they are. Any help would be greatly appreciated. (single father limited funds.) Thank you for any help you can give bill.