Cadillac DeVille Questions - Cadillac Deville 2001 won't Pull the fuse that is labeled "ECM" or "ECU." The inside of the fuse panel lid shows a chart indicating where each fuse is located. Pull the fuse straight out of the fuse panel. Turn the ignition switch to "ON" without starting the engine. Leave there for five minutes. Turn the ignition switch off. Put the fuse back into its slot in the fuse panel.