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You probably blew a fuse of knocked out a wiring harness during the install. Check the fuses first, if you don't see anything blown pull the radio back out and be sure all the wiring harnesses in the area near the radio are secure.
Go to the auto parts store and get a wire adaptor made for a 1992 trueno. It will plug into your factory harness. The wire colors are prematched to your sony and other aftermarket stereos. Just match the wire colors, splice with connectors making sure no wires are exposed. (A little electrical tape for good measure around splices helps). Then it just plugs in. If your factory stereo has mounts that screw onto the radio, unscrew them and attach them to the sony. Remove sleeve from radio and discard. The screw holes are already on the sony.
The antenna wire has been wired wrongly to receive full time current whenever the vehicle is turned on. It is supposed to be wired to the remote turn-on wire from the radio, so it goes off whenever the radio is turned off.It will have to be rewired to work correctly.
check for power going to the radio with a simple test light. If the radio unit has 12 volts going to the unit, and also has an apprpriate path to ground THROUGH THE CORRECT GROUND LEAD is the key though, the unit should operate.. unless the unit itself was damaged during the event.
here is a diagram of the radsio connector wire colors in your car, just match them up to your Sony. 1998 Chevrolet Malibu Car Stereo Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Orange Car Radio Accessory Switched 12v+ Wire: Yellow Car Radio Ground Wire: Black Car Radio Illumination Wire: Gray Car Stereo Dimmer Wire: Brown Car Stereo Antenna Trigger Wire: Pink Car Stereo Amp Trigger Wire: N/A Car Stereo Amplifier Location: N/A Car Audio Front Speakers Size: 4′ x 6′ Car Audio Front Speakers Location: Doors Left Front Speaker Positive Wire (+): Tan Left Front Speaker Negative Wire (-): Gray Right Front Speaker Positive Wire (+): Light Green Right Front Speaker Negative Wire (-): Dark Green Car Audio Rear Speakers Size: 6′ x 9′ Car Audio Rear Speakers Location: Rear Deck Left Rear Speaker Positive Wire (+): Brown Left Rear Speaker Negative Wire (-): Yellow Right Rear Speaker Positive Wire (+): Dark Blue Right Rear Speaker Negative Wire (-): Light Blue