Bob, I'm sorry to hear about all your problems. But, my experience with my 2020 Unity TB, seems close to the problems you encountered. I took delivery of my unit mid-November. I didn't immediately start having the delayed start problem until after about 5 starts. It got to the point that I could count to 5 before it started. We didn't camp in our unit until late January heading to Florida. So, what I want to establish is that we didn't create much condensation because we weren't in the unit enough for that to develop. Another fact, after the first 2 starts, right after taking delivery, it started requiring that the Fob be placed in the holder. At first, it probably required that about 50% of the time, but ultimately, it ended up being 100% of the time. From my understanding of the MB owner's manual, having to place the Fob in the slot is considered and "emergency" start procedure? So, on this first real camping trip, we came back late one night, and found that the Fob would not open the house door. Not a big deal, except the following morning, the engine would not start, tried jumping it to no avail. Not only did it not start, but none of the dashboard lights were on, and courtesy lights didn't even come on. We were situated in our camp site so decided to wait until Monday to call for Roadside Assistance. Fortunately, Sunday night, I tried starting the engine and it started up after the usual 5-6 second delay. Drove to MB Sprinter dealership, they checked and said there were no Fault codes, mentioned delayed starting to MB service manager, his comment, "that's normal for the new 2019 Sprinter chassis". After camping for the next couple of weeks in cold weather, we did have some condensation on the windshield, which we wiped up every morning. The condensation was certainly not literally dripping. However, that's when our real problem manifested itself. We got a dashboard message of "Auxiliary Battery malfunction", along with the fact that none of the Driver assistance functions were no longer operational. I then encountered all the problems you described, engine wouldn't shut off, had to repeatedly try the start the engine, no driver assist. Was able to get it to the MB Sprinter dealership. Their prognosis was water entry/moisture traces, removed driver side kick panel to access ignition control module and found control units EZS and CPC with corrosion at pin connectors and wiring harness. Dealership referenced
Service Bulletin L154.21-N-069524. My question, is it reasonable to expect corrosion to take place in such a short period of time when the unit was not being subject to much continued condensation? It seems more reasonable, that the unit was compromised prior to delivery. MB dealership did the repair and it seems to be working properly (no delay in starting). However, the dealership did not cover this repair under warranty, even though I only had the unit 2 months, mid-November, 2019 to January, 2020, when this all started to occur. During that time, as I previously indicated, we weren't using the Unity. Bob, did your MB dealership cover the repair under warranty? When did you take delivery of your Unity TB?