Official Fix for Sprinter Speakers! Leisure Travel Van Service A Cost 

Yesterday, went for my B service. I had given them the service bulletin number you showed in your video. In Canada, it is a different number. They did not 're pin' the wires, they used a recent software update from MB. I was very doubtful it would work.... but it does, and the sound is fantastic. Seems that MB changed/inverted the audio outputs in the computer instead of physically changing the wires. Very happy.

We got our skylight/vent covers kit just before a 2 week trip. They are awesome and worth the expense. We traveled several days in the 90's, a couple near 100, and we were able to keep the entire coach reasonably cool by using just the dash a/c.

I did the fix myself in less than 30 minutes. It’s fairly easy to swap the wires once you figure out how to get the connectors apart. There is a small tab on each connector that needs to be removed (it is easy to pry off, just don’t drop it down the hole where you rmoved the speaker. I covered the hole with a rag and some tape). Then you have to figure out how to get the wires out - i used a very small eyeglass repair screwdriver but a toothpick would probably work. There is a small tab on the wire that needs to be depressed to release so you can pull the wire out of the connector - note that you have to do this twice on each wire as there are two places the tab will catch. Push the tabs in, pull the wires out and put them in the opposite connectors. The sound is now fixed! Sounds great and the balance controls actually do something. It’s easier than it sounds.

I recently had quotes from two different Sprinter dealers for the B service - both just over $1,000.00. I did the service myself, parts just under $200 (including premium German oil - Ravenol Motor Oil HLS 5W-30 Synthetic) and found the Sprinter (3500XD) to be relatively easy to work on. I will soon disconnect the front speaker and hopefully find that one of the two Denver, Colorado, Sprinter dealers will look up the service bulletin and then swap the correct wires for a "full fix".

Steer clear of Albuquerque Mercedes for service. Dropped off for B service the day before the scheduled appointment so they’d have it first thing the following day. Told them I’d come back the day after the appointment so they’d have an entire day to take care of it, do not rush it. Went back to pick it up and it had not been touched. Service manager apologized (kinda) and I told him keep it all day and I’d pick it up the next day. Less than two hours later he called and said it was ready. I find it hard to believe that all that the B service includes was performed. I think they changed the oil/oil filter and reset the oil maintenance counter and nothing more. Can’t prove it but one indication that they may have skipped a few checks was my TPMS showed that all 6 tires were not up to correct PSI. I literally filled the tires to correct PSI in the Mercedes parking lot with my air compressor. I didn’t go in to complain because I was pretty pissed and knew it wouldn’t have gone well. I did leave a detailed review and someone called me a few days later to apologize and covered the cost of the additional hotel night. The Mercedes service manager, in my opinion, is incompetent. I’ve had great experiences elsewhere over the past two years.

We picked up our 2021 LTV Unity RL from the MB shop in Sanford, FL yesterday (7/22/22) after having Service B performed. Total P&L plus tax was $1,484. Yikes! Sure wish I’d seen this video about the speaker fix before taking it in, but will definitely be running it back over to have that done. Thanks so much for the info, Brandon! We’ll be appreciating it on our upcoming trip to NC. PS - We’re also loving our skylight covers! Thanks for making those available to us. They make a big difference!

I just did the speaker fix detailed in your video. Easy to do and worked perfectly! Thanks a million for sharing this, much appreciated. Next time I have it into the M-B dealer I will see if they can perform the "full fix". 2022 Airstream Interstate 24X on 2020 M-B Sprinter 3500XD.

Based on what was mentioned in the video and some of the comments, I gave this a shot. I swapped the two connectors. I had to first break off the alignment tabs on the connectors because they would not fit into the opposite slot. Put it all back together and fired it up. It is SO much better. The center speaker no longer completely drowns out the others. Still not as good as I would expect from Benz, but It'll do for now.

Follow up to your center speaker fix. I quickly called my MB shop and made an appointment to fix the speaker armed with your information. They reconnected the center speaker, I disconnected it from the day I learned the fix, but despite your “L” number info they couldn’t fix it. They couldn’t find any crossed wires. They left the speaker connected so I promptly disconnected it. I was very disappointed. Now that I know the shop that fixed yours I will likely call and see if I can get them to provide the fix to my shop. Have you heard of anyone else with fix as a result of your video?

I was at the MB dealer a weeks ago for inspection and oil change. They did not say any thing about the sound fix…. The dealer service told me no oil change until service A comes up or 2 years of use. I am at one year with 5k miles so all I got done was the inspection done after driving 94 miles to the closest dealer. I was beyond frustrated then and now hear they have a sound fix but I have to go back to the dealer to get that fix. 😤. Do they publish a DYI wire fix we can do at home? What is the fix I’d? If not. Btw I love the covers in my 21 UMB it keeps the temp no so fing hot. It is just 104 today in central tx.

Do you know if this is for MB sprinters with a standard stereo instead of th mbux system? Our standard stereo sound is horrible and has to be cranked up to 3/4 to be able to hear it.

Just had the Mercedes dealer fix the center speaker issue. Bulletin LI82.85-N-071147. Center does is back on and not overpowering. It seems wires got crossed in production.

Our dealership did the fix before we arrived to take delivery in November 2021.

Thank you very Much for sharing this information !! Would you be so kind as to sharing the service code as written up so I can take mine in without getting into a long conversation with service people? Thank you again

Mercedes dealer in Salem OR charges $900.00 for A and $2300.00 for B

Look into the Beat Box system.

Can you provide the full TSB ? I can only find one with the headline discussion and no details that you are reading. My dealer says just unplug the center speaker since TSB adjustment makes NO difference... I want to show him the full TSB.. Thanks

I hope this works!

My Mercedes service said they are not responsible and they do not do the fix…..they said it was not part of the chassis!! I asked who would i need to deal with and she said she had no idea!!!!🤯

I took 2019 3500 Sprinter / 2022 Winnebago Boldt to the MB Dealership to have the radio fixed as per your video. The service manager watched your video. MB found the LI 82.85-N-071147 and switched the two wire connections. The radio still sounds exactly the same. They switched the two wires on the center speaker. Are these the two wires that need to be switched? SM told me they did what was recommended and it can not be corrected any further and that the vehicle was never made for rear speaker and the two in the doors are just tweeters. I also pointed out the Balance control does not work and the Fader Front to Back Option does not show up. Is the MB dealership pushing me off because they can't figure it out? What to do? I just disconnected one (purple & gray) of the two sets of wires from the center speaker. It sounds much better and now the balance works, but not the fader front to back. So again, did they switch the wrong two wires? If not, what's my next step. HELP and thank you...

do you know if the 2022 models still have this problem Mine built picking it up soon

9 minutes and 17 seconds to tell you to take your van to the dealership. LOL! Solution: Swap the green and purple wires. Don't touch the gray wires.

Do you know which two wires are crossed? THX

$2400 Sevice B at the Mercedes in Redwood City

Do you have any idea yet on diy? The leisure dealer here in Sandy, oregon won’t work on it unless you purchased from them

If Mercedes is aware of the issue and had a fix for it at the time this video was published, how come they still produce them with that issue in 2023/2024. I picked up my Unity in February. 2024 model on 2023 chassis, and the sound was horrible. Your middle speaker fix made it ok. So, Mercedes would rather keep fixing the issue than fix the production? I don't get it.

Doing some research because when we called our local MB dealer to schedule apt for recall issue and mentioned we wanted to have stereo issue resolved he said they would run the diagnostic first. I said I have the LI number and this is a known problem - he wasn't sold (and I am not impressed with their over the phone service). My research has found Brandon's LI number (82.85-N-071147) is correct, and it's now version 6, dated 7/19/2022 with "the fix". There are actually 4 wires that need to be moved. There is a youtube video that shows some of the fix with good comments on what needs to be done -ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-p4KJKdlroFQ.html. Thanks Brandon for all your great advice!

Ah come on now..... it is only 109 here today. :)

Disconnecting just sucks.. There is better solution for this. Just design passive crossover with induction and capacitor and make the ugly mid range frequencies to disappear.

We gave the fix number to our dealer in Georgetown, TX, and unfortunately that didn’t fix it. Would you be able to share your dealer’s info so we can make an appointment up there to get ours fixed? You can pm me if that would be better. 2022 UnityRL