Radio Reset for 2006 Hyundai Sonata

you can easily solve the problem from the operator manual which is available on the reliable store
http://www.reliable-store.com/products/2006-hyundai-sonata-service-repair-manual-download

http://www.autofuseboxdiagram.com/12363-2006-hyundai-tucson-inter-panel-fuse-box-diagram


Interior Fuse Box Location 2006 2010 Hyundai Sonata 2009 Hyundai Sonata...

http://tucsondrivers.com/download/file.php?id=771&t=1&sid=12ab5c82ef857801b0fdef85e390ab85

Sounds like the dealer may be correct to me, but make them guarantee the job.

You probably cannot fix any of this, but the body shop where you took your car should do so.
I sounds like a wiring harness was involved in the colision.
It may either be severed, or may have been pulled loose by the collision.
That harness mat be under the floor mats, under the car, or somewhere else.
If I were you, I would be sure to find out exactly where this repair was, for future reference.
For example, the body shop may say: "This problem was repaired by repairing the harness by the floor shifter".
God bless your efforts.

trey and check the rear shock absorber

It hard to say, it could be the radio itself not putting out any sound or it could be the external amplifier. assuming the radio work fine, than it will be the external amplifier or visa-versa. the radio out put low frequency sound which we call it pre-amp line which run to and connected to the ext. amperfier, ext. amprefier then amplify the sound to the speakers. if the ext. amplifier if faulty than you will get no sound even though the radio is working properly. hope that make sense..good luck, if you need to replace the stock ext. amplifier, check on ebay for good deal, don't buy it new from a dealer, will cost you arm and a leg. you can also just replace the new entired radio systems (after market) but use the same speakers.

Ok, the high pitch sound is your idle pulley bearings going bad. The splash of water is exactly that, the belt gets wet and slips. Definitely a pully, more than likely the idler pully.

1997 Hyundai Sonata Car Stereo Radio Wiring Diagram
Car Radio Constant 12V+ Wire: Red
Car Radio Switched 12V+ Wire: White/Green
Car Radio Ground Wire: Black
Car Radio Illumination Wire: N/A
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger: N/A
Car Stereo Amp Trigger Wire: N/A
Front Speakers Size: 4′
Front Speakers Location: Dash
Left Front Speaker Positive Wire (+): Brown/White
Left Front Speaker Negative Wire (-): Black/White
Right Front Speaker Positive Wire (+): Brown/Yellow
Right Front Speaker Negative Wire (-): Black/Yellow
Rear Speakers Size: 6 1/2′
Rear Speakers Location: Door
Left Rear Speaker Positive Wire (+): Brown/Red
Left Rear Speaker Negative Wire (-): Black/Red
Right Rear Speaker Positive Wire (+): Brown/White
Right Rear Speaker Negative Wire (-): Black/Whi

Battery ORANGE (+) RADIO HARNESS
Accesory YELLOW (+) RADIO HARNESS
Ground BLACK (-) RADIO HARNESS
LF Speaker (+) BROWN/WHITE
LF Speaker (-) BLACK/WHITE
RF Speaker (+) BROWN/YELLOW
RF Speaker (-) BLACK/YELLOW
LR Speaker (+) BROWN/RED
LR Speaker (-) BLACK/RED
RR Speaker (+) BROWN/WHITE
RR Speaker (-) BLACK/WHITE