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you need to make sure the ir sensors on the tv are conected. to do this track down the plug from the tv that goes to the dvd make sure the audio cables on the tv are also connected to dvd and not just the video cable
First thing to do is check to make sure that the batteries are properly charged.
Second, make sure that you have a clear line-of-site to the IR transmitter. Infrared (IR) works the same way that your TVs remote control works - if the signal is blocked, then you will not hear any sound.
Third, make sure that you are in the rear seat of the vehicle when listening to the sound. The IR transmitter only transmits to the rear seat, so you will not hear any sound if you are sitting in the front seats. This is a common problem that i see.
Lastly, make sure that the heapdhones you purchased are compatible with your 2006 2007 2008 2009 or 2010 Toyota Sienna. Remember that some older models require RF headphones, not IR headphones. I checked http://www.audiovideo2go.com for compatibility before I purchased my headphones. They have a useful listing of all the headphones and models of vehicles they are compatible with.
most all infrared headphones are interchangeable just do a search and should find plenty of sources to buy from you dont need to get gm ones.I know audiovox works as i have used these on gm vehicles before
If you're handy, you could rig up a wireless solution to this. The problem is that you have two screens, each presumably playing a different movie. If you purchased an off-the-shelf wireless transmitter accessory, you could connect it to one of the screens. But then if you purchased a second wireless transmitter accessory, and connected it to another screen, you would need to make sure both wireless transmitters were operating on different frequencies, so that each person could wear a different pair of headphones and listen to their own movie. Hopefully this makes sense.
You could use either an FM Modulator to do this, or an Infrared Audio (IR) transmitter... Remember, these units aren't like factory installed headrest systems; they don't have the wireless audio transmitter already built-in, so you can't just buy wireless headphones and listen to them.
Firstly, make sure your DVD have built-in IR wireless module so that your headphone can receive the audio signal from your DVD player.
Second, it should be clear which frequency transmitted from your DVD player. Generally speaking, there are two frequency of IR transmitter.One is 2.3MHz/2.8MHz. another is 3.2MHz/3.87MHz. Only emission frequency same as receiver can receive the audio signal.