behind the radio
It's located under the center console below the radio. Remove the side panels to access it.
A no good ecm
You'll find it under the hood left fender next to the windshield washer reservoir.
Are you talking about the Electronic fuel injection relay? It is located near the ECM under the center console.
The 1992 Chevrolet Astro Van ECM can be tested with a diagnostic tester. Most auto mechanic shops have diagnostic testers.
ECM is the electronic control module. This runs and monitors the various electrical components and sensors for the engine. This may be located in the console behind the radio, but you will have to consult the particular car's manual for actual location, removal and reinstallation, which is really not that difficult. Electrical connections are at the rear of the unit.
1992 sunbird is obd1,1996 firebird is obd2.Will not work.
The ECM on a 1992 S10 Blazer is located below the glove box.
Testing an ECM requires it to be installed on the vehicle.
You need to be more specific. What about the ECM are you testing?
Under the passenger seat.