Jim Lewis
Well-known member
- First Name
- Jim
- Joined
- Jan 10, 2023
- Threads
- 44
- Messages
- 841
- Reaction score
- 719
- Location
- San Antonio, TX
- Vehicles
- Honda Accord 2017; 2023 Lariat ER
- Occupation
- Retired
See this post by @TaxmanHog. He says that when the truck is charging, the HVB contactors form a circuit to the FCSP. Only when the truck is not charging will the HVB contactors form a circuit to the LVB and charge it. My truck HVB was at 63% SOC and not charging since I'd previously reduced its scheduled charging limit to 50% SOC.Have you monitored LVB SOC change with the truck "off" and while charging on the FCSP? It may be that turning the truck "on" engages the HVB contactor and that is what initiates charging of the LVB, whether the truck is on the charger or not.
https://www.f150lightningforum.com/...ota-6-2-0-small-adjustments.17006/post-343064
So, yes, my conclusion would be even with the truck in auxiliary mode and not fully on, the HVB is in contact with the LVB and charging it, which I confirmed by reading the LVB voltage (14.45) with Car Scanner via my Veepeak OBDII device and also seeing the LVB SOC continually increasing (particularly slowly after it passes 80% SOC).
My statement that the truck was not fully "on" even when it was plugged into my FCSP and NOT charging is based on getting an advisory message on the dash after pushing the Power button and stepping on the brake that if I want to power the truck up fully, I need to unplug the FCSP charger from the truck. And my normal start-up screen is the Vehicle Information/Tire Pressure screen. At one point during my 8-hour Power Up v6.3 download and install, I unplugged the truck, powered it on, and got the tire pressure screen that I wasn't getting with the truck plugged into the FCSP. During the download/install process, thinking maybe the update might be complete and my Sync screen just hadn't refreshed, I also turned the truck completely "off," left it off for a while (~10 min) a time or two, before powering it back on. So, based on this single set of anecdotal observations, once an OTA update starts, the continuation of the download seems fairly robust (as long as you (barely!) have a cell connection). During the download and install the Sync screen stayed lit (and I had the Auto Power OFF timer turned off). I realized the install was complete when I checked the truck and found the Sync screen off. Powering it on, I got a notice that the truck had been powered off to save battery - so perhaps there is a download timer/switch independent of the Auto Power Off timer used for normal driving that at least kicks in after a download is complete to assure the vehicle is shut down if not being driven.
I haven't tried just turning the truck on cleanly to auxiliary power (not pressing the brake pedal). I'll try that for the next update and also try unplugging the truck and just going with the auxiliary power mode. I vaguely recall some update advice saying you don't get OTA updates if your foot is resting on the brake pedal, so that might be a reason I didn't get either 6.2 or 6.3 the first time I turned on the truck - because perhaps I sat there initially with my foot resting on the brake pedal (ICE habit).
I hope what I've described is a routinely workable method for getting updates. It means you don't have to go out for a long drive just to get an update but can get it without putting (unnecessary) miles on your truck. AIA if it's an already well-known phenomenon. A few other folks have mentioned leaving the truck on to raise the LVB above 80% SOC to get updates. The new twist here is just turning the truck "on" without driving and without having the SOC > 80% is enough to initiate the OTA updates that are delivered when the truck is running. The truck was locked up in my garage, so I didn't have to worry about anyone driving off with it.
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