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Hello... I am sorry to hear you are having problems. I am unsure if you bought this as a package deal with the headphones or purchased the headphones separately. If you purchased them separately, they may not be compatable. Headphones come in different frequencies. The reason for this is if you had 2 different dvd players and 1 kid was watching Spongebob and the other kid was watching Hannah Montana, they would not interfere with each other as far as sound. Some dvd players will allow you to change the output frequency of the IR (infrared) transmitter built into the dvd player. This feature would be in the menu section of your dvd player. Make sure the headphones are on properly, because if they are backwards, they may not read, because IR frequencies are "line of sight" meaning the receiver (headphones) has to see the transmitter (dvd player). You will see a tinted window that has 3 or 4 bulbs. That will be your transmitter. Make sure you have good batteries in the headphones and that you have them turned on. If you have power and have checked the IR frequency, and they were purchased aftermarket, then you may need a different set that receives the correct frequency. If this is a package deal and you have checked the batteries and they power up properly, you may have a bad IR transmitter inside the dvd player. With the info you provided I can only speculate at this point, but this gets you on a start. Let me know if I can help more! Good luck with your venture!!
my xo vision gx 2148, and was installed in my car, read format vcd, mp3, cd but not read format on DVD, the manual that comes with the unit says whether to accept DVD format, I know that I do, as I get the wrong lock code (8888).
unfortunately these units require the remote to adjust volume visit www.remotes.com they have the remote for mvohd70 (the infrared headphones have volume on sides) if it is RCA cabled to your head unit you can control sound in car but if you are referring to the direct headphone jack remote is the only solution
We have a GMC Envoy which also does not allow us to play the sound from the dvd player through the car's speakers. Although we purchased the vehicle new with the dvd player already installed, it was installed by the dealer, making it after-market. I assume those that were installed in the factory work differently. Maybe this is the case with your's as well. Good luck!!