Clock is blank

Thank you Paul. Did you contact Denso directly? If so, do you have an email address to share? There were 13 different GM vehicles that had this Denso system as an option.

Stop! Do not take anything apart--you cannot fix it. I know with 100% certainty it is a software problem and there will be a dealer recall fix "soon". You can read about this on Corvette Forum. The problem is covered in the GM #PIT5652E: Clock shows dashes and cannot be set after Battery Disconnect - (Jun 4, 2019) The makers of the unit software, DENSO are working with GM Engineers to come up with a permanent fix. Certain models do have access to the Maintenance function screen which does have a way to reset the clock. Some, like mine don't. This affects 14 models of GM cars and trucks--Caddies STS, DTS, Avalanche, Corvette, Silverado, Suburban, Tahoe, Sierrs, Yukon, Denali, H2, Grand Prix and Saab years 2004-2012. I have been personally involved in the discussion since Jan 23, 2019 when I reconnected the battery and mine went out in my C6. The problem began in November 2019. Even installing a new GM NAV of the same vintage will not make the clock and ETA's on the map work. So stop and check with your dealer so you will be on the list for the recall. Sit tight, my sources say DENSO has requested some units from a radio overhaul company in NYC for beta testing within the past two weeks--Sep 2019. I got a call from GM today Oct 4, 2019 and they confirmed its close. Do not take anything apart--you cannot fix it

That is what I said weeks ago! Denso the Manufacture will be releasing a firmware update through GM. All models but the Cadillac and Corvette can be overridden by the dealer and set your clock. Corvette and Caddies must get a firmware update.

Sorry to apparently echo some of your previous findings. Only one piece of the thread came to me when I did a web search and I had very very very recent info.

Just get a 2019 Corvette instead! LOL

Auto 8 speed paddle shift Grand Sport. I like C6s too. As you can see my 2005 coupe in the background. The fix is coming for 2005-10 Corvettes with Navigation, although I put a 2012 USB Navigation head in it and it is not affected!(For now LOL). The electronics in the C7 are way superior. Faster too with the 8 speed auto. In economy mode it approaches 30 mpg cruising at 65. Pretty good for 460hp, Cheers

I've been following this thread for months and just found the fix posted. It's from a Chevy mechanic in CT. I'm off to try this now! https://www.corvetteblogger.com/2019/11/08/video-corvette-mechanic-paul-koerner-shares-c6-corvette-blank-clock-navigation-fix/

Chevrolet now has the fix. It is also available on the Corvette forum.