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Clock is blank

Tiny
PAUL KEECH
  • MEMBER
  • 2005 CHEVROLET CORVETTE
  • 6.2L
  • V8
  • 2WD
  • AUTOMATIC
  • 11,200 MILES
Hi, I had the Navi radio out to install a GM PAL adapter. After installing the clock in the radio is blank. I have read it may need a firmware update or does it take a few hours of driving for the clock to sync? The display comes on fine, When you first start up in nav mode it displays the no GPS flag which goes away in a few miles. I have also taken the PAL unit back out no difference. All functions work except the clock. The Pal adapter GM part 17800593 is a GM kit made for the C6 Corvette. On the Corvette forum more than five people are having the same problem. I took the Nav head out carefully and reinstalled carefully. All of the others say all they did was disconnect the battery. I am wondering if the Nav head has a battery inside that has gone bad? Please help.
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Tuesday, December 18th, 2018 AT 9:54 PM

34 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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If others are having the same issue I would say the PAL unit is causing the issue. We need to scan the CAN to see which module is not working right. Here is a video:

https://youtu.be/InIlnsjOVFA

Let's check for power at fuses #8 (cluster) and radio S band fuse. Here is a guide and the fuse location as well below. Also, I have included the instrument cluster and heads up display wiring so you can see how it works.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.
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Thursday, December 27th, 2018 AT 5:32 PM
Tiny
PAUL KEECH
  • MEMBER
  • 13 POSTS
You didn't read my reply or the corvette forum thread! I have removed the PAL and still no clock! 5 or 6 other C6s from 2005-2010 have done nothing more than disconnect the battery and the clock won't come back. If I had blown fuses the Radio wouldn't come back. We are all wondering if the GPS signal changed(unlikely) but there are 6 or 7 of us having this problem after dec 18. The Nav gets its time from military GPS sats. Very strange. 2 people are going to a Chevy dealer in FL tomorrow. Im in CA. So we must be on different satellites. One user went in for warranty work for the headlights, they unhooked the battery and boom No Clock. The PAL unit works just fine as does the AM, FM, XM and CD players. My nav will get me to the correct dest. 35 miles of curvy mountain roads and followed the map just fine. Doesn't lmake sense.
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Thursday, December 27th, 2018 AT 8:31 PM
Tiny
PAUL KEECH
  • MEMBER
  • 13 POSTS
Here is a picture. It won't adjust.
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Thursday, December 27th, 2018 AT 8:51 PM
Tiny
KEN L
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It sounds like the vehicle communication module went out possibly from a voltage surge when connecting the battery but to be sure we should scan the CAN to see if the modules are talking. Here is a video that shows how to do it:

https://youtu.be/InIlnsjOVFA

Let me know what you find.

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Friday, December 28th, 2018 AT 9:32 AM
Tiny
CBLEWISII
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There are multiple Corvettes being affected by this. My 2008's clock went blank last week after it was in the shop and the battery was unhooked. I am in another thread where there are four or five of us that this has happened to within the past two weeks after the battery was unhooked and then re connected. Thinking it might be a satellite issue where it draws the clock info from. GM has been notified by multiple dealerships as of today.
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Friday, December 28th, 2018 AT 12:42 PM
Tiny
CBLEWISII
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Also, a guy in that thread had his working properly and offered to unhook his battery and test it out to see if it would happened to his 2007 also. He did and it did the exact same thing. It's not a car issue, but is a signal issue it looks like.
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Friday, December 28th, 2018 AT 12:44 PM
Tiny
PAUL KEECH
  • MEMBER
  • 13 POSTS
If the Communications Module went out we would have a lot more problems than no clock? Wouldn't we? Chevrolet told Corvettezman that the radio is bad. We will see. I ordered a 2011-2013 USB radio for it and a new antenna so we will see. Well there is a dozen of us that unhooked the battery and reconnected it in the last two weeks and no clock returns! Do you actually think that all our radios failed?
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Friday, December 28th, 2018 AT 5:29 PM
Tiny
KEN L
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I am not sure that why I wanted the CAN scan.
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Sunday, December 30th, 2018 AT 11:36 AM
Tiny
PAUL KEECH
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  • 13 POSTS
I have R & Red the Nav Antenna so I am sure that if the new antenna acts the same as two used ones its not the antenna! LOL. I have read on navcen. Gov that they are implementing changes(new clock signal have already been added) that will be started in April 2019 and may cause trouble on receivers that is firmware is ten years old. Hmm 2010 corvette radios were probably made in 2008 or 2009 and may have problematic firmware. Others may start having problems. This may be a signal issue!
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Sunday, December 30th, 2018 AT 12:30 PM
Tiny
PAUL KEECH
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It is not the Navi antenna! Tried a new one and two used ones all the same!
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Monday, December 31st, 2018 AT 8:17 AM
Tiny
PAUL KEECH
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Installed a 2012 radio and it all works now. Just got to do the VIN swap.
The jury is still out on it may be in need of a firmware fix. Thanks
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Thursday, January 3rd, 2019 AT 9:09 PM
Tiny
MARVIN KLEIN
  • MEMBER
  • 1 POST
The military made a change to the GPS signal on or about 12/13/18. It impacted c6 Corvettes up to the 2010 models for sure. The firmware in the radio will need to be updated once GM has the fix. I opened a ticket with GM and suggest everyone that has this issue does the same. To avoid the problem you can insert a feature saver into your cigarette lighter when you change the car battery. Otherwise you will not be able to set the time until the software is fixed.
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Monday, April 1st, 2019 AT 8:41 PM
Tiny
KEN L
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Excellent addition to this thread! Please feel free to help out whenever you are on the site :)
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Tuesday, April 2nd, 2019 AT 11:29 AM
Tiny
JIMCL
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Thanks to all for the posts! Having the exact same problem with 2005 C6. Unhooked battery two weeks ago and thought I "broke" the radio when no clock appeared and no way to set. Sorry for the stupid question but where do I open a ticket with GM?
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Tuesday, April 2nd, 2019 AT 5:42 PM
Tiny
PAUL KEECH
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Chevrolet Customer Service. 1 (800) 222-1020
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Tuesday, April 2nd, 2019 AT 7:04 PM
Tiny
RONALD DAY
  • MEMBER
  • 1 POST
Thanks Paul Keech for the telephone number! I also have the same problem - clock not working
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Saturday, June 22nd, 2019 AT 6:52 PM
Tiny
KEN L
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Please let us know what you find. We are interested to see what it is.
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Tuesday, June 25th, 2019 AT 1:06 PM
Tiny
PIRANA
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Thank you Marvin Klein. I am having the same issue with my 2006 Grand Prix GXP. GM service document ID: 5355382 (Service Document is PIT5652E) references this issue of GPS not working after battery disconnected. Called GM Customer Service with issue. No way to escalate the issue any higher. Recommend that you take pictures and email them with description of problem and reference the GM document with the navi system option (U3U, U3Z, URB, US4 or YQ4) on your car. In the subject line, use the year / make / model. Email this to nhtsa. Webmaster. Gov Although it falls outside their scope as a driver assistance device or safety issue, they may take a further look at it if they see repeated emails. OH, feature saver was used in the cigarette lighter to keep power, but issue still occurred.
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Thursday, September 5th, 2019 AT 4:20 PM
Tiny
PAUL KEECH
  • MEMBER
  • 13 POSTS
Wala here's the answer. The Nav head made by Denso was doomed to fail from day one! The programmers missed what to do on the GPS week Rollover. Denso is now working on a fix for the 2005-2013 Corvettes and XLR Cadillacs. Not sure about the pontiac. I wa told the clock could be overridden on all other GM vehicles. Firmware fix is coming.
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Saturday, September 7th, 2019 AT 1:05 PM
Tiny
KEN L
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Thanks for the update Paul, have a good weekend.
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Saturday, September 7th, 2019 AT 1:14 PM

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