i have parking switch to view external dvd player..but somehow it doesnt work...when i filp the switch ON n OFF i can see on the manu screen function getting activated and deactivated...what should i DO????

check the coonections make sure they're tight. Also make sure the switch isn't bad.

i have parking switch..all the wires are connected properly...the parking switch is working but i see nothing but the warning sign when i play external dvd player...

Is the DVD player hooked up properly?

Check the RCA connections.