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You have possibly melted a couple of wires together along the radio circuit. Also the radio unit itself has 1 or more protection fuses actually inside the unit that have blown, usually at back of unit in little bay near the wire clusters.
Check your relays too, a blow out through jump starting can do all sorts of little burn-outs.
check to see if you blew a fuse your rav-4 has a switch that when you press on the brake it allows you to switch out of park but without pressing the brake you can't switch out off park. There should be an abs fuse or brake fuse or something of that order check it. Hopes it helps.
If you can, pull the bulbs for the saloon lights and disconnect the radio. Put in another fuse. If it doesn't blow, the problem is in the lights or the radio. If it does blow, the problem is in the clock or some other item on the aux circuit. you may have to wait until the water dries out of the wire bundle or connector where it is shorting things out.
Either the radio itself has developed an internal short, or there is a short along the wiring from the fuse box to the radio. It is one or the other. If the fuse blows with the radio turned off, then the problem is a short in the wiring from the fuse box to the radio. In that case, its time to try to crawl up under your car's dash and hopefully find where the wiring has rubbed against a piece of metal and shorted out.
I would remove the dome light, and disconnect the wiring connector, and then put in another fuse. If it does not blow, I would think that the dome light switch is shorted to ground.
The quickest way to find a short circuit is by putting a bulb in place of the fuse. Anytime the time the bulb lights there is a load. And if the load is a shorted wire the brightness of the bulb will give you a hint. So while you're at it, finding a 'short' is a quicky...keep your eyes on the bulb. gotcha!
Try checking all the grounds for the radio, over time they can weeken. If that doesn't work, put in a new ground wire with a heavier gauge, that should fix it. It sounds like a ground problem.
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