Post 12v drain - how to sync clock / time setting?

[David Baldwino]

Like a few of you I have suffered the dreaded 12 V complete drainage, locking me out completely and had to call in the boys at Porsche Assist. I left the car for a week unattended.

2 weeks has passed and all three clocks in the car are not synchronised. The centre console has the correct time, the sport Chrono and the dashboard show completely different times Independently

I cannot for the life of me find out how to synchronise these. Any clues?
Thanks

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[W1NGE]

I'm guessing you gone to settings...system...date and time within PCM and set to auto?

 

[David Baldwino]

I'm guessing you gone to settings...system...date and time within PCM and set to auto?

Thanks for that. Yes, done both, screen mirrors your photo. Tried in my Acc and guest. Powered up, powered off, lock and unlocked car. Same result. In a 4g area with good data comms. . Thoughts on the software version? Says I no notifications. Appreciated in advance.

 

[W1NGE]

Nuclear option and either pull the PCM fuse or disconnect 12v for < 5 mins to force a hard reboot.

Don't think its a software version issue.

 

[David Baldwino]

Nuclear option and either pull the PCM fuse or disconnect 12v for < 5 mins to force a hard reboot.

Don't think its a software version issue.

Good option, I will go nuclear however probably when I’ve made it back from deepest darkest Wales late tonight just in case it all goes tits up. I will let you know if there is any nuclear fallout.
Cheers for now.

 

[W1NGE]

Good plan and may The Force be wit

Good option, I will go nuclear however probably when I’ve made it back from deepest darkest Wales late tonight just in case it all goes tits up. I will let you know if there is any nuclear fallout.
Cheers for now.

Good plan ?

 

[David Baldwino]

Good plan and may The Force be wit
Good plan ?

Just a quick catch up, further to the nuclear option offered, no need as the same happened about three weeks later. I went away for a week and left it once again for exactly 7 days. The alarm then sounded a few times on the morning of the eighth day and hey presto, couldn’t get in the car. Tried the key again with a manual option, no joy. Porsche Assist phone call followed by a visit swiftly from the AA recovery. The AA man had great knowledge even though he needed a couple of calls to Porsche technical to once again get in the car. Manual key in, 10 to 35 minutes and lift the handle and lift it again. Handle actually lifts far higher than in normal mode when in manual mode. After much discussion between the AA and Porsche technical concluded that the problem is triggered when charging the car to 100%. Which I tend to do on occasions. See attached correct 12 V charging connections. As soon as the 12 V battery was charged we rebooted the PCM and all was back to normal including synchronisation of timepieces. Car has had the big update at the Porsche dealer which took the car for an overnight stay. No doubt there should be a fix for the 12 V draining issue at some point. PS, the important manual bonnet pull is the pesky little red lever.

 

[satchurator]

I was wondering if you are affected by the interior alarm sensor recall and that was somehow contributing.

But then the charging to 100% theory… did Porsche say why charging to 100% is causing this?

 

[W1NGE]

100% charging leading to a 12v issue sounds highly unlikely IMHO.

 

[Rainforest]

100% charging leading to a 12v issue sounds highly unlikely IMHO.

I didn’t charge my car to 100% and my 12v drained. I feel it is somehow related to changing charging settings using the app. I had just done this, and two hours later the car went dead.

 

[W1NGE]

I didn’t charge my car to 100% and my 12v drained. I feel it is somehow related to changing charging settings using the app. I had just done this, and two hours later the car went dead.

If there was a correlation then we'd all be experiencing it.

It could be you have a faulty 12v battery rather than anything else.

If your car has all the current 12v patches from months ago then even odder.

Which EVSE are you using?

 

[Rainforest]

If there was a correlation then we'd all be experiencing it.

It could be you have a faulty 12v battery rather than anything else.

If your car has all the current 12v patches from months ago then even odder.

Which EVSE are you using?

Porsche said the 12v is working fine. They blamed my Fitcamx, but I don’t think that’s the reason because many people have used it without issue, including me for 6 months.

I did notice that my PCM was constantly waking during the night and turning on my dash cam. After Porsche did the WNA5 update following my dead 12v, it stopped doing this.

I doubt the 12v is faulty because not many people have had to replace their 12v. I’m guessing it is software related.

 

[W1NGE]

Hmm,.camera is beginning to sound like a potential candidate.

 

[David Baldwino]

I was wondering if you are affected by the interior alarm sensor recall and that was somehow contributing.

But then the charging to 100% theory… did Porsche say why charging to 100% is causing this?

I didn’t know about the alarm recall. The hundred percent charge theory actually came from the Porsche technician on the other end of the phone. He said to the recovery assistance guy that during 100% charging the 12 V system is being drained. Also sounds a little crap to me…… until next time

 

[satchurator]

I didn’t know about the alarm recall. The hundred percent charge theory actually came from the Porsche technician on the other end of the phone. He said to the recovery assistance guy that during 100% charging the 12 V system is being drained. Also sounds a little crap to me…… until next time

Could have been a misunderstanding on the part of the recovery assistance guy. Perhaps the technician was speculating about 100% HV battery drain i.e. you were at or near zero. There is an HV battery charge threshold below which the 12V does not get charged.

I suggest you press your OPC to confirm/ensure that you have all software updates relating to the 12V battery drain issues (discussed heavily in other threads here) as well as the interior alarm sensor recall campaign. If you have any 3rd party stuff connected (Dashcams, ODB2 dongles, USB gadgets etc) I would disconnect all of those for a while - just to eliminate opportunities for blame-shirking while you press for resolution.
Be aware of the best practices per the manual regarding maintaining HV charge:

1. Charge to 100% only ahead of long trips.
2. Charge to 80% for shorter daily driving.
3. Charge asap if HV battery falls below 5%.
4. For idle periods of 2+ weeks, connect HV charger and use profile to maintain 20-50%. Don’t leave off the charger.
5. For idle periods of 2+ weeks, if you can’t leave connected to charger, charge HV to 50% and check every 3 months to ensure charge never falls below 20%. Avoid using Porsche Connect app in this state, which discharges both HV and 12V batteries.

Numbers 3, 4 and 5 all have implications for the 12V battery. Note particularly the 20% threshold and advice about the Porsche Connect app usage when the vehicle is not connected to a charger.

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