2009 Toyota 4Runner Owners Manual - Page 301

3-3. Using the rear audio/video system n If the remote controller batteries are discharged The following symptoms may occur. l The rear seat entertainment system control will not function properly. l The operational range is reduced. n When replacing the AA batteries Batteries can be purchased at your Toyota dealer, electric appliance shop, or camera stores. Replace only with the same or equivalent type recommended by a Toyota dealer. Dispose of used batteries according to local laws. n Headphones With some headphones generally available in the market, sound quality may be poor. Toyota recommends the use of Toyota genuine wireless headphones. Please contact your Toyota dealer for further details. n Volume Conversational speech on some DVDs is recorded at a low volume to emphasize the impact of sound effects. If you adjust the volume assuming that the conversations represent the maximum volume level that the DVD will play, you may be startled by louder sound effects or when you change to a different audio source. Be sure to adjust the volume with this in mind. 278