encountered a navi screen problem where the screen showed the lexus logo and just blacked out. Although the radio works but the navigation screen is blacked out and the buttons do not work. Is this fuse?]

it looks just like this (borrowed following picture from another member)

 

Wait 15min and turn it back on

 

this occurred right before my battery died. thus, i was thinking about disconnecting the battery.

 

Try pressing the map button

 

the buttons do not work at all. however the security light work.

 

As noted in the other thread, disconnect car battery for 5-10 mins and reconnect.

Post result please.

 

I had same problem few weeks earlier. Ebay guy fixed it for $195.

http://www.ebay.com/itm/LEXUS-LS-GS-...28fe9e&vxp=mtr

 

^Like FSportIS, I had the same exact situation with my 2IS. I ended up not being able to do any of the DIY fixes to correct the issue, and came to realization that the problem was internal circuitry breaking down and losing connectivity over time due to heat (thermal expansion and contraction). Being a electrical noob, I opted for either the ebay seller referenced above or a different NAV unit altogether. I ended up finding a good, locally used '08 NAV unit at a budget-friendly $400. Fixed my problem immediately upon install of the new unit.

GL!

 

It is ridiculous how many of these cars are getting this issue!

 

^Yep. I've thought about applying some thermal reflective tape to the NAV unit housing to keep the excessive temps out. Haven't gone through with it, as who knows if it'll be worthwhile.