Hide in the bushes and watch. Results to be determined.

 

I have a 07 STS and the clock came back today after being out since January.

 

What does the date say?

 

My optimistic take would be that it is probably "soft coded" to epoch 1 (I should say "defaults") since that is the most sensible given that the entire design and sale of the car existed in epoch 1. So I think this behavior is possible:
- On rollover, i.e. a 0000 week, our clocks work and would set the time correctly when that setting is selected
- The date will probably be week 0000 of that second epoch (i.e. 1999)
- We should be able to manually set the date
- A manual GPS sync should still hold the date since it now knows it was in the third epoch (i.e. the epochs are predefined in the code, which isn't too much of a stretch, since they are known for all time at least while the 10-bit week code is used)

Not sure what I would bet on this but it certainly seems possible. Yes, this is the "everything goes back to normal and no update is required" scenario...

 

There is no way to manually set the date.

 

We are getting closer to the big day, where we all hope our navigation and the time comes back almost cannot wait until it will be April 06 2019 ;-)
I'm so excited if it's going to work on my Cadillac here i Denmark.

 

I have been following this thread, as I too have a 2008 STS with the same Denso unit. Unfortunately, I did not know about this Denso-programming debacle a few months ago, and neither did the dealership that disconnected my battery.

The GPS Week Number Rollover will actually be on Sunday the 7th (1024 weeks from 08/29/1999), and I am hopeful that even a (wrong) date/time (that can be maintained), may solve the GPS sync issue. The SAT movements are incremental, so location should be maintained, and sync up fast, as it did prior to December.
We'll see......

 

If we want to get exact:

From here: https://www.xyht.com/gnsslocation-tech/wnro/

"The second scheduled GPS week number rollover (WNRO) will occur, according the rollover info on gps.gov, at 18 seconds prior to the 0000Z boundary (Coordinated Universal Time) between April 6 and 7, 2019—around midnight GMT, or Saturday afternoon of the the 6th in North America. If a GPS receiver is running firmware or software that cannot resolve that calendar ambiguity, it could have a flashback to 1999—the time of the first cycle of 1024 weeks from the 1980 zero week."


That will be at 5pm on the US west coast, so late afternoon / early evening for most of us. Don't forget, you MAY have to disconnect your battery again (or it may happen on its own).


Also the GPS satellites relative positions change very quickly: https://sciencing.com/how-fast-do-gps-satellites-travel-12213923.html

"With the Earth rotating once every 24 hours, a GPS satellite catches up to a point above the Earth approximately once a day. Relative to the center of the Earth, the satellite orbits twice in the time it takes a point on the Earth's surface to rotate once."

That's why a receiver knowing the date and time is very important for quick finding and decoding. Otherwise it just takes longer because it doesn't know the most likely ones to be overhead at a given time.

 

"With the Earth rotating once every 24 hours, a GPS satellite catches up to a point above the Earth approximately once a day. Relative to the center of the Earth, the satellite orbits twice in the time it takes a point on the Earth's surface to rotate once."

That's why a receiver knowing the date and time is very important for quick finding and decoding. Otherwise it just takes longer because it doesn't know the most likely ones to be overhead at a given time.

I learned something new from this!!!

The earth rotates once every 24 hours... therefor, it is NOT flat! :worship:

 

A little more info about the GPS almanac:

https://www.lifewire.com/gps-almanac-1683312

 

Something funny happened today while waiting for the day to come where everything is back to normal again, my GPS has come to itself again.
After my mechanics had disconnected the frame wire to my GPS / radio unit, the GPS card has been quite oblique.
It has shown my location but it has been 50 - 60 km wrong.
But suddenly today it was in place, my time has not yet come into place.
But there is also just over 10 hours yet until it is April 6 here in Denmark, I can hardly wait ;-)

 

The big day has come, but there is no change.
Is there something to do manually ??

 

The change is supposed to happen at midnight GMT between April 6th and April 7th.

 

April 7th, 2019 Midnight GMT = April 6th, 2019 8:00pm EDT = April 6th, 2019 7:00pm CDT

and so on.

If midnight GMT comes and goes, then we know.

 

4 hours, 20 minutes to go. :woot:

 

In Denmark is there right now only 1 hour and 12 minutes :beer:

 

LOL.

April 7th Midnight GMT = April 7th 2:00am Central European Summer Time

I fail to see why this is so confusing. Rollover is at Midnight GMT.

 

The rollover happens at the same time everywhere in the world. It's a GLOBAL Positioning System.

 

Something is definitely happening I am getting a GPS signal locked much faster before my car could only find two satellites now it can find around 6

 

https://time.is/GMT

 

Right... so 2 hours from NOW, not an hour 12 minutes from when you posted an hour and a half ago.

 

Well?????????

 

After GMT, my clock's date still read April 6th, 2019 versus resetting to some date in 1999.

I have not had my battery disconnected since this whole thing started so the clock still works.

 

I got all excited today when the GPS with the line through it went away, and my map started working correctly, and I went into the diagnostics and saw satellites that were connected. But alas, no clock, and later today, all was not working again. Too much to hope for I guess.

 

It would be good to try another full reboot of the nav (disconnect the battery for a short time again). It could be stuck in a funky state from the original problem.

 

Is there an easy way to disconnect the navigation, or is there only the hard way to remove the ground wire?.
I have looked through the instruction manual to find a fuse for the navigation, but can't find a fuse called navigation, but now English is not my mother tongue either, maybe you call it something else.
I have had a night watch so I am now on my way to bed, maybe there is a solution when I get up, hope everyone gets a good day.

 

The fuse is probably labeled radio.

 

Anyone dare to press the sync with GPS button and see what it does?

 

Where is that button, I am a danish viking I dare greatly ;-)

 

Can you try leaving it disconnected for longer? 15 to 20 minutes? To make sure the internal power stored in capacitors is really drained.

 

now it has been without power for 35 minutes, now we must see when I later run on jobs if time has come

 

Does anyone have the "Diagnostic PIN number that you must enter to get into the diagnostic GPS screen?
(for a 2008 STS)