I have a 2004 T&C Minivan with only 35K miles. I recently changed the battery (after 6 yrs). Its been a couple weeks since the change and today the Radio, which has a navigation did the following:
When I insert the key and turn it to the position so that the accessories work, everything works fine. The minute I turn the key to ignition and start the engine, The radio switches off. Everything else, works fine. Another intereting thing is that, if the radio was set to CD changer, I would still hear the CD from the CD changer playing as that would still be on after ignition. Also, I can control the volume of the CD changer from the radio that "has no power" after ignition. I cannot however change the mode from CD changer, to AM/FM or NAV after ignition as none of these buttons work. There is no power on the head unit and not even the time is displayed.
My guess is that there is nothing wrong with the head unit as it works fine when power is supplied to it prior to ignition. I am sure that power is being supplied from a different source after ignition takes place.
Can anybody advise as to what the problem might be. This is not covered under the 7yr/70000ml drivetrain warranty. Please help.