well, i pull a similar cap off a hard drive that was a couple uF... didnt fix the issue but at didnt make it worse either!
the unit turns off when the car turns off (no 60 sec to sleep) and doesnt save any nav settings unless i hold the eject button down.. a guy at work suggested using a cap at the eject line big enough to hold power for 60 sec or maybe run a lil circuit with a transistor and smaller cap...
I havent verified, but I think everything gets saved if after you turn off the car, hold the eject down for a minute.. if so, the above idea could be a potential fix..
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