something we need to reset the device, because we had lost the signal. but can it to work with the device, chec those point. i will try to explaine it,with some steps.
Turn on and park. The vehicle must me turned on and please, for safety's sake, parked.
3Press the DVD softbutton located at the top right of the Menu screen.4On the DVD info screen, press these FIVE positions in this exact sequence: Upper Left, Lower Left, Upper Left, Lower Left, Lower Right. This should reveal the SERVICE MENU. If not, press BACK to exit the DVD info screen and go back to step 3.5From the Service Menu, press and hold the OVERRIDE button until it is selected6Press BACK at the top right to exit the Service Menu.7Press BACK at the top right to exit the DVD info screen
2Press the Menu softbutton located at the lower right of the screen. This reveals the Menu screen.
second point , tha we try to do is those another points.
now. chec the wiring and chec each fuse odf fuse box, and also check the relay of ech one, next, check the reset poit tah the devise have near the screen or back it the devise, i hoppe tahe de failure is there so you must be carefully with de each sensor, check wiring sensor back your car, an conected if some of there is datached i mean the wire plug. before,if you want take yous sienna and get up a scans the cars computer, we can see more about this problem with the data of the device.
next, if the back camera persist with those problem we need to buy one, but tray to do this, that i said, or had tell you,if yu have a dvd of your city.because one of this problem could be this,you brouht sienna in USA but you leave in Panama and the maps mut be chenge too, wityh the dvd maps.
wel i hoppe to be helped you
thanks very much by your atentions
accept my grettings