A friend forwarded this to us. I’m surprised the MB shop we use didn’t mentions this. They seem to be up to date and very through. Guess they have to wait until the MB customer field testing generates enough info for them to publish service bulletin updates.
Battery....
Comments from LTV blog:
Anyone with a 2019 chassis have their "auxiliary battery malfunction"? It's happened twice now in our 2020 UMB. We were in Phoenix earlier in the month and the dealership replaced the auxiliary battery and we drove back home fine. We are now back in Calgary, Alberta and it happened again yesterday. My understanding is it allows for the operation of the electronic systems (like the electronic transmission shift) in the event of a main chassis battery failure. When malfunctioning it also stops the use of the cruise control and I'm sure a bunch of the other stuff I've not noticed. I need to take to my local dealer but wondering if anyone else ran into this? Part of the water issue? Phoenix dealer didn't offer any explanation other than they replaced the auxiliary battery and cleared the codes.
James Yuhn shared a link. November 1, 2019
Battery disconnect information for owners with the new 2019+ VS30 chassis Sprinter. The new Sprinter has the same disconnect near the throttle for the main battery as does the previous generation.
However, the new Sprinter also contains a small auxiliary battery. The aux battery provides backup power so that the transmission can be shifted to/from Park if the main battery dies. There is no mechanical linkage from the gearshift to the transmission, it is entirely electrical now.
The Sprinter owners manual not so helpfully states that when disconnecting the main battery for storage, the aux battery must also be disconnected. Pull fuse 32 from
the fuse panel on the side of the drivers seat. URL:
https://www.upfitterportal.com/en-us/ Look under Technical Information and select Product Bulletins.
If you don’t disconnect the aux battery, it goes dead after a while. Don’t ask how I know this.
So to the point of my post. Mercedes has published on the upfitter portal a method to disconnect the aux battery without too much in the way of contortions. Simply remove fuse #32 from the fuse panel on the side of the drivers seat. It’s right there under the vinyl trim which LTV installed. Here is a link to the document on the MB site:
Homepage:
https://www.upfitterportal.com/en-us/? fbclid=IwAR3RdeMNvAiQGeVlykxDTeWDPFADB58eyLC0cwRC19_g1PeK1Ti2BKzPSEU Under Technical Information select The Product Bulletins menu item and then scroll through the list to the Emergency Battery item.
Problem: Help! Just pulling LTV on 2019 chassis out of storage and have an ‘Auxiliary battery Malfunction’ as well as ‘Active Distance Assist Inoperative’. It’s been in storage (in Palm Springs) for a few weeks, with the Quick battery disconnect disconnected (by driver footwell) House bank batteries are 100% and operating fine. Anyone see either of these?
Answer: (James Yuhn) The small auxiliary battery has died while in storage and must be replaced. It is supposedly located under the drivers seat, though I’ve not personally laid eyes on it. You will have these error messages and no cruise control until it is replaced.
If you read the owners manual carefully regarding battery disconnect, it tells you to also disconnect the aux battery. But no information on where or how.
Battery....
Comments from LTV blog:
Anyone with a 2019 chassis have their "auxiliary battery malfunction"? It's happened twice now in our 2020 UMB. We were in Phoenix earlier in the month and the dealership replaced the auxiliary battery and we drove back home fine. We are now back in Calgary, Alberta and it happened again yesterday. My understanding is it allows for the operation of the electronic systems (like the electronic transmission shift) in the event of a main chassis battery failure. When malfunctioning it also stops the use of the cruise control and I'm sure a bunch of the other stuff I've not noticed. I need to take to my local dealer but wondering if anyone else ran into this? Part of the water issue? Phoenix dealer didn't offer any explanation other than they replaced the auxiliary battery and cleared the codes.
James Yuhn shared a link. November 1, 2019
Battery disconnect information for owners with the new 2019+ VS30 chassis Sprinter. The new Sprinter has the same disconnect near the throttle for the main battery as does the previous generation.
However, the new Sprinter also contains a small auxiliary battery. The aux battery provides backup power so that the transmission can be shifted to/from Park if the main battery dies. There is no mechanical linkage from the gearshift to the transmission, it is entirely electrical now.
The Sprinter owners manual not so helpfully states that when disconnecting the main battery for storage, the aux battery must also be disconnected. Pull fuse 32 from
the fuse panel on the side of the drivers seat. URL:
https://www.upfitterportal.com/en-us/ Look under Technical Information and select Product Bulletins.
If you don’t disconnect the aux battery, it goes dead after a while. Don’t ask how I know this.
So to the point of my post. Mercedes has published on the upfitter portal a method to disconnect the aux battery without too much in the way of contortions. Simply remove fuse #32 from the fuse panel on the side of the drivers seat. It’s right there under the vinyl trim which LTV installed. Here is a link to the document on the MB site:
Daimler published a note on their upfitters portal in September regarding this issue. Pull fuse 32 from the fuse panel on the side of the drivers seat. URL:
https://www.upfitterportal.com/en-us/ Look under Technical
Information and select Product Bulletins.
Don’t ask how I know all this. Dealer replaced mine under warranty. No out of pocket, but hassle of dropping off the MoHo for service.
Daimler published a note on their upfitters portal in September regarding this issue. Pull fuse 32 from the fuse panel on the side of the drivers seat. URL:
https://www.upfitterportal.com/en-us/ Look under Technical
Information and select Product Bulletins.
Don’t ask how I know all this. Dealer replaced mine under warranty. No out of pocket, but hassle of dropping off the MoHo for service.
Homepage:
https://www.upfitterportal.com/en-us/? fbclid=IwAR3RdeMNvAiQGeVlykxDTeWDPFADB58eyLC0cwRC19_g1PeK1Ti2BKzPSEU Under Technical Information select The Product Bulletins menu item and then scroll through the list to the Emergency Battery item.
Problem: Help! Just pulling LTV on 2019 chassis out of storage and have an ‘Auxiliary battery Malfunction’ as well as ‘Active Distance Assist Inoperative’. It’s been in storage (in Palm Springs) for a few weeks, with the Quick battery disconnect disconnected (by driver footwell) House bank batteries are 100% and operating fine. Anyone see either of these?
Answer: (James Yuhn) The small auxiliary battery has died while in storage and must be replaced. It is supposedly located under the drivers seat, though I’ve not personally laid eyes on it. You will have these error messages and no cruise control until it is replaced.
If you read the owners manual carefully regarding battery disconnect, it tells you to also disconnect the aux battery. But no information on where or how.