Wait a sec. Back up a minute.
Not quite. The 12V powers the computers to command and the coil to close the pre-charge contactor, but it's still actual current from the HV battery (through a resistor) that fills the precharge capacitor so the primary contactors can then be closed. They aren't boosting the 12V to precharge the capacitors directly as your description suggests.
Picked up the Duralast Gold T4 today. Installed and reset the BMS. Hopefully this solves the Deep Sleep for me!
I'm probably going to take this step soon.
It didn’t work when I reset it either. I think it has to be done at the dealer using their laptop.
I don’t know. I am only passing on what the dealer told me. All I know is that my truck was doing exactly what yours is doing and after taking it to them, it is not doing it anymore. The update had something to do with the battery management system.
The reset procedure can be easily done by the owner and takes 60 seconds (then let it sit locked and untouched), it’s in the Owner’s Manual...
If you care to test, I recall others saying they disabled telematics/modem in system settings, and they did not experience significant battery drain. Maybe that test can narrow down if that’s what’s sucking your battery down to deep sleep levels and keeping it there? I guess that would possibly be a different issue than the failure of the system to charge the battery correctly in the first place?I don't know how much more proof my dealership (Ford) needs. But here it is.
AFTER a 40 minute drive as soon as I got home, like less than 5 minutes after I turned the key off I attached a 6 amp charger. And my stock battery took nearly 6 amps. 52 minutes later the charge rate tapered and the battery was considered 100% and was testing at 12.84 volts no load.
Just sat 14 hours (over night). 14 hours later, 12.07 volts no load.
After 52 minutes:
After sitting 14 hours, next morning:
Any more issues?
The potential issue is essentially apparently the almost continual use of the 12v making it very difficult for any bms to 100% fully charge battery and have it rest there. If the 12v is 99.9% charged, most likely less, sulfation will gradually build until battery it will charge to 12.1 or more volts and when a load is placed on it voltage will rapidly fall as there is little capacity. I went through this with a 2012 H Crv that would eat a battery in 26-34 months. I finally woke up and started every three to four months putting a 5amp smart charger maintainer on for three to five days. That battery lasted 64 months. So far I have not placed a maintainer on my hybrid first edition and have had no sleeping. I did have my cable overlay TSB done ten days ago and truck seems to a little peppier/better (??) Maybe they updated software. I have had my hybrid since 3/9/22 18,nnn miles on 8/4/23. Has sat for 4 days at most usually one or two.
Yep. It's reverted back to no interior lights about a month ago. I've given up on doing anything else on my end. I figure the next step is to have the dealer figure it out with the CSP that was released a few months ago in addition to getting the air bag and whatever else recalls I can't think of at the moment.
