Gen1 community! I have a 2002 with the OEM nav package and 85K miles that's having a really weird issue with the controls/displays. Car starts, runs, and does all the right Prius stuff (instant low-end torque, will run pure electric, shuts off at lights, not revving high for no reason.) 12V tests well and isn't low (vehicle gets driven once about every month, is on a battery maintainer the rest of the time.) The multi display intermittently just goes black, and takes a few minutes to recover. After it recovers, the integrated navigation system does not work (MAP/DEST/MENU buttons don't respond, the audio system doesn't even make confirmation beeps for those buttons, and the display doesn't even say "external device not connected", it just doesn't do anything.) The energy monitor will show if I press INFO, but it doesn't show where the power is going, and there's no outside temperature display. The "consumption" screen reset, and now it just shows 99.9. The Instant MPG bar doesn't move (it just shows 100 while I'm moving, and 0 while stopped.) None of the audio controls work unless I am playing a CD in the changer. Even then, the only button that works is AUDIO (switch between audio screen and energy monitor.) Not even the volume control works, and I can't turn the audio system on or off. "km/h MPH", "ODO/TRIP", and the hazard light switch work fine. The climate control also works fine, and it appears to talk to the hybrid system like it should (if I turn the defrost on, the engine will kick on.) OBD scanner shows no diagnostic trouble codes, but I will get an intermittent MAIN battery light on the multi-display. However, as I mentioned before, the vehicle seems to run fine (it will run on EV, and it has instant torque, it doesn't seem like the problem is the main battery.) All signs (except the fact that I don't have any OBD codes) point to some sort of catastrophic network failure. Has anyone else had this problem who can help me out? Thanks in advance.
