J50 clock date suddenly reset to January 1

[suko]

I've got a 2011 J50 that I imported six years ago. The unmodified factory AV system date and time has always been correct ( Japanese timezone of course ) up until last month.

About two weeks ago, at engine start, the system wished me a happy new year ( in Japanese of course ).

I can't think of anything that would make the system think that the date had changed, unless the GPS component has failed/reset somehow ?

I checked the GPS reception in the system settings, and it can still see the satellites.

Has any other J50 owner had this happen ?  It's no biggie, just annoying that it tells me the wrong date anytime I start the engine. 😅

[niZmO_Man]

Low battery? Maybe check capacity?

I know first-hand, on BMWs if your battery drops below 80% capacity, it starts causing strange issues.

[suko]

Thanks for that tip, niZmO_Man. I think the battery is OK. It's quite a new one, but I'll check. Last time I needed a new battery, everything electronic was fine, except that there wasn't enough current to turn over the starter.

I decided to order one of the partial AV system translation CDs from Car Audio Workshop in NZ. That might have some effect, or help me diagnose the date problem. 🤞

[MBS206]

With the system, once you drive it for a bit, and before you turn the car off, does the car fix its date and time? When you say the date is wrong, what date does the vehicle think it is, and does it always show the same date?

My thoughts from a process driven view is;

The system may be defaulting to a standard start date/time.

The main reason you'd typically see this occuring, is the system is losing its constant/backup power supply.

 

If its always defaulting to the same date/time at start up, and especially if it fixes itself while driving, I'd say either the non volatile memory has an issue, or the power supply to the volatile memory that stores this information.

 

The other thing I'd check is if there is anywhere in the system you can adjust the date and time from. If the date/time is still moving forward since it wished you happy new year, then it is 100% possible the system has just had a bit of data corruption occur, and you likely need to find a way to reset the date/time in the vehicle.

[suko]

The time is always correct. Only the date is wrong. It currently thinks it is January 19. Tomorrow it will say it is January 20.

The date and time are ( should be ! ) retrieved from the GPS navigation system.