Need to install towing wiring

I don't show factory provisions for installation of a tow package so the wiring may have been a matter of guesswork. You wouldn't need a headlight connection for normal towing.

your grounding out some were check wires

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Trailer Wiring Diagrams 4 Way Systems

4 way flat molded connectors allow basic hookup for three lighting functions; right turn signal / stop light (green), left turn signal / stop light (yellow), taillight / license / side marker (brown) and a ground (white).

4 way tow vehicle side.
4 way trailer side.
5 Way Systems

Same as 4 way system listed above but adds a extra blue wire for brake signal or auxiliary power. Used on pop up camper trailers or utility / boat trailers.
5 way tow vehicle side.
5 way trailer side.
6 Way System, Rectangle Plug 3/4 inch by 1 inch 6 way rectangle connectors right turn signal (green), left turn signal (yellow), taillight (brown), ground (white). The red and blue wire can be used for brake control or auxiliary. Use on a small motorcycle trailer, snowmobile trailer or utility trailer. Can also be used as custom wiring on trailers with 3 light/wire systems. See "Tow Vehicle Taillight Wiring" below.
6 way tow vehicle side.
6 way trailer side.
6 Way Systems, Round Plug

Round 1 1/4" diameter metal connector allows 1 or 2 additional wiring and lighting functions such as back up lights, auxiliary 12v power or electric brakes. Note: The black (sometimes red) 12v and blue electric brakes wire may need to be reversed to suit the trailer. Check with a test light or VOM. Uses: horse trailer, travel trailers, landscaping trailer, car trailer, etc.

6 way tow vehicle side.
6 way trailer side.
7 Way Systems

Round 2" diameter connector allows additional pin for auxiliary 12 volt power or backup lights. Uses: heavy duty landscaping trailer, car trailer, boat trailers, horse trailer, travel trailer, construction trailer, etc. Check with a test light or VOM.

7 way RV flat blade tow vehicle side.
7 way RV flat blade trailer side.

Check for the tow relays in the under hood fuse box. Black box behind the battery on the passenger side. Do a web search for 'titan tow relay' for more info.

If you have a wired tow hitch on your car you will need to mate this to the wiring harness on the tow bar. If the two wired units do not match then you will either need an adapter or will need to rewire the tow dolly or the car. If the car doesn't have a tow light unit installed you will need to install one that will mate to the tow bar light unit.

I hope this helps - please rate me

On the trailer plug
Yellow= Right turn/brake
Green= Left turn/brake
Brown is marker lights
white is the ground.
You might want to check with a parts store to see if a "hoppy" plug is available, it plugs into the factory harness and make it much easier and neater. Lee

Use an adaptor specific to Audi..The module will allow fast hookup and won't cause warning lights on the dash to light up..

You may have a tow hitch but no wire harness? You gotta buy a trailor wire harness kit and may need a professional to hook it up because there are a lot of wires to deal with. Normally the hookup it mounted near the hitch it self, but my guess is you don't have one.

Here is a Utube video for you for the wire hookups! http://www.wonderhowto.com/how-to/video/how-to-install-a-trailer-wiring-harness-on-a-hyundai-sonata-164439/

the harness is there you need the plug that goes from the factory plug to the kind of plug you need for your trailer. the harness is wrapped around the wires for the rear tail lamps