I have the DVA9965. Do I have to have the power supply box fort to work? or is there a way to wire it in like regular head unit?

There are fuses and relays everywhere. You need an auto electrician.

https://www.google.com/search?q=auto+electrician+near+me

1. main motor relay.

• IGN - ignition;
• STOP - brake lights;
• GAUGE - O / D valve, instrument panel warning lamps, 2WD-4WD switching valve;
• CHARGE - battery charging system (lamps);
• TAIL - side lights;
• ECU + B - (electric control unit battery) - electric control unit powered by battery;
• DOME - interior lighting;
• ECU + IG - (electric control unit ignition) - electric control unit for power supply from the ignition lock;
• DEFOG - rear window heating;
• HEAD (LH) - left head light;
• ENGINE - consumers - distributor, main relay, control units;
• A / C - air conditioner;
• WIPER - windscreen wipers;
• TURN - turn indicator system;
• HEAD (RH) - right head light;
• RADIO - radio;
• CIG - watch, cigarette lighter;
• FOG - fog lights;
• HAZARD - alarm, sound signal.

Fuse box diagram Toyota Town Ace Noah and ...

FuseAndRelay.com https://fuseandrelay.com > toyota > town-ace-noah

The main fuse and relay box in the passenger compartment is located under the dashboard, on the driver's side, behind the protective cover. Type 1. Photo - an ...

‎Location · ‎Type 2 · ‎Passenger compartment fuse...

Hi,

What do you need now is a wiring diagram for that..

Find a power source at the fuse box with a test light and run power to the radio wires.

Most likely need a new blower motor resistor

The head unit has likely failed then in this case.

Hi, I assume you are powering regular speakers in the car, right?
The amp needs a power cable from the fuse box or battery.
This cable should be about 6 gage and should have a fuse of about 150 amps.
You will need a ground cable, also 6 gage and connect it tightly to the chassis under the dash.
Disconnect all speaker wires from the head unit, and use a pair of RCA cables to connect the head unit preamp outputs to the amplifier.
Also from the head unit, connect the blue wire to the "turn on" terminal of the amplifier.
Finally, connect your speaker wires to the amplifier.
Your speakers should be rated for at least 500 Watts, or you will blow them with this amp.

Please let me know if you have questions and thanks for using FixYa.

Good chance that the radio power supply to those speakers have gone bad. There common for the GM Delco head unit, when the head unit get's hot. The solder get's weak and then you have what they call a cold solder, causing a bad current flow to the power supply to the rear speaker wire harness.
If you like to keep the stock head unit, you can remove it and have a electronic shop repair the head unit. Or you can go to the salvage yard and see if you can locate an other head unit for around $50.00, you should be fine with the year of your Cavalier, the 2001 and newer head unit was mated with the car's Vin number through the ECM to have it function.
Thank you for using fixy and good luck.

find your remote wire. it would help to know the type of car and the kind colors of wires your using as your 3 main wires.
normally in most chevy and fords they are yellow 12 volt.
black as ground.
red sometimes even a tan as your remote start.
deff check your start

Check the fuse on the control board inside the head unit,if its ok you need to replace the contrl board

The unit is hard wired (no plug). with the kick plate removed, you will see a wiring box. With the power off, open the wiring box and disconnect the supply wiring then disconnect the incoming wire from the unit. turn off the water and disconnect the water line under the unit. disconnect the drain line under the sink and pass the slack through behind the dishwasher. Open the door and remove the mounting screws holding the unit in place. slide the unit out.

Please take the time to give this solution a fix ya rating

clarkco