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Hello claude_bouth,You need a vehicle specific aftermarket connector generally called a "wiring harness". Your JVC came with a plug that fits the back of the receiver with "pigtail" wires which you splice to the harness wires. http://www.SonicElectronix.com sells the Metra 70-7301 which appears to be the correct harness for your Elantra.You can tap into the wiring of the car harness and splice the wires by function into the appropriate car wires, but using the aftermarket vehicle specific wiring harness is a lot easier and you don't need to disturb the vehicle wiring in any way, just plug into it. It also makes it possible to re-install the factory radio if you ever need to do so. If you choose to tap and splice, you can find your Elantra's wiring color code at http://www.modifiedlife.com.Hope this helps.
Your switched ignition lead is hooked to a constant voltage wire.
You need to find a source wire that is only given power with the key in the on position.
One wire (yellow) on radio goes to a power wire with +12V constant power (regardless of key position)
The other wire (RED) on radio will need to be attached to a Power wire whose supply is only +12V when the ignition is enabled.
Since you are using a wire harness, you just need to reverse the 2 wires as they currently are installed.
Hope this solves one problem anyway.
the wires being reversed on the harness also may not activate an internal relay allowing the steering wheel functions to operate.Switch the 2 power wires, and re-try.
If the steering wheel controls still fail to operate properly, your module may be defective.
You can go to a place that installs car stereos and purchase a universal wiring harness for your car that will cost about $15 and allow you to do the wiring very easy without the need to know what every wire is for. This harness would be wired to the harness you got from JVC for your new radio and all you need to do is to match the colors of the JVC harness to the same colors of the universal harness that would then just plug right into the factory wiring harness for your car and then the other end plugs into the connector for your JVC radio. It is very easy and insures that you have all the proper wires connected to operate your radio and have full functions available for use.
If you require to know what each wire from the JVC harness is for, just ask.
I would be happy to offer you more help if you need it, just reply to this post and I will get back to you as soon as I am able.
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Thanks and good luck with your radio installation,
I had some two conductor wire, which is used generally for alarms or for low voltage items, umm what i would recommend is you can use some of the two con for the Purple positive on your harness, but get something a bit thicker in gauge for the Yellow battery, use something more that would accutaly hold better power that you can use in terms of powering items, you should be able to get away with using something like that sorry if this isnt too much help, best bet is using alternative wires, otherwise try a Radio Shack they might have a Radio Harness or even bestbuy