Navigation Screen Blackout After Battery Replacement?

check the voltage at the battery....it should be 12.5 volts...your equipment sounds like it's suffering from an undervoltage condition....even if a new battery, there are things that can go wrong, such as the cable going to the motor block should be clean and wirebrushed to allow at least 50 amps service...and the clamp-post should have NO corrosion on them black and red too...also there is certainly an auxilliary or two extra red loopers off of the positive cable...(those are from the alternator, and to the devices) perhaps those were not made shiny clean and are creating the undervoltage condition...wirebrush everything for great electrical contact~...think this is about proper voltage to the chassis~ ...good grounding~!

Hey billiegoat - did you figure out what caused your navi issue? I'm having a similar issue, but I hadn't replaced the battery. Navi & bluetooth not working. Occasionally, the screen "reboots" itself, showing the Lexus logo (radio goes out for a few secs when this happens). Climate controls and radio works (including touch screen).