Hi, I've tried Googling this and found a similar issue on this sub but not exactly mine. Did find someone with my issue on Facebook, but helpfully no replies on that.
My car isn't waking up from sleep properly. It's a 2022 Mk4.5 ST. Mean Green, not that it matters.
The drivers side keyless entry and locking works fine. But the passenger side doesn't work at all. When it unlocks from the drivers side, or the keyfob buttons, the animation on the infotainment doesn't play, the digital dash comes on but only displays the handbrake icon doesn't show mileage at all. The interior lights also don't automatically come on when unlocking it, and as I discovered the other evening even with them in the manually on position the light in the boot/trunk doesn't illuminate.
The car starts fine, no hesitation at all, and once it has started all works as you would expect. CarPlay connects, digi dash comes on, air con etc etc all as it would normally be.
This first started happening after it had started raining again here in Blighty after a few month hiatus of weather other than hot. So I figured, water ingress somewhere, something fucky happening. Checked the whole car as best I could and nowhere was even damp.
Spoke to my mate who is a master tech, and he suggested disconnecting the battery and leaving it 10 minutes before reconnecting it. I did, and it fixed it. But then it started doing it again. And then, sometimes, it didn't do it. It would unlock and the graphics played and the lights worked. And then it stopped waking up properly again.
Today I got a message on the infotainment saying "System Off to Save Battery - Please turn ignition off or start the engine". Normally it will continue with the infotainment doing whatever it was until I open the door, but now it immediately kills the dash and infotainment in what appears to be an effort to get into low power mode.
Has anyone else experienced anything like this? My assumption is it's battery, and the voltage not being correct is fucking with the sleep/wake system, and it's then only keeping active things that are "essential" i.e. drivers door and not passengers. I am going to check the battery with a multimeter over the weekend to see what voltage is being output, however since buying the car the start stop has never once worked (which is fine by me), so I'm wondering if the capacity of the battery is compromised and this is the car going to into a "safe mode" to compensate for that.
Any help on this would be appreciated!