Where is the ECM located in a '95 Saturn SC2

SOURCE: 2001 sl2 saturn inertia switch

if you are refering to a inertia switch like on a ford that kills the fuel pump in a crash, the saturn does not have one

SOURCE: 2001 saturn sc2 gets code 341&340 camshaft sensor

if you have high resistance in secondary ign. system (plug wires, ign.coil) this will cause this code to set. make sure you are using a high quality spark plug wire set. not from autozone!!! and denso non platinum tipped spark plugs. also use a diaelectric grease on plug wires to keep moisture out.

SOURCE: Locating a horn, Saturn SC2, 1996, 3 prongs.

The three prong is an older design. They went to a new model so you will have to replace it with newer style assembly, horn and socket.

SOURCE: 95 saturn sc2 and the a/c compressor does not engage when I turn on the switch

either it's undercharged or there is something unhooked/ faulty in the electrical system. more than likely undercharged.

SOURCE: Torque converter clutch leak? saturn 95 sc2

trans mission has to be removed from engine !
the front pump seal will need to be replaced!
its a big job & cn be messy !
just get a good transmission specialist to do it !
as it will neeed a service aswell!
Cheers Rob