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Discussion Starter #1
Hello!
Does Mercedes makes a trailer brake controller for the Metris we can retrofit? My trailer has electric brakes, and my Metris has the factory tow hitch and connector, but not the brake controller. I know there are aftermarket options i can go with, but would prefer the clean OEM look if Mercedes makes one

Thanks!
 

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Mercedes does not offer a wired brake controller. You'll have to get a specialist like a hitch shop or RV center to tap into the brake switch wiring and run a hot lead to the the seven wire connector socket as part of the controller install. I like the Tekonsha Prodigy controller. At least you have the factory wiring, which will include a converter for making the two way trailer taillights work with the three way taillights on the Metris. The converter module in the Sprinter was troublesome, and I had several units fail (until I soldered an aftermarket unit into the wiring) - hopefully they have more robust module in the Metris.
 

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It's true that Merc does not make a electronic brake controller. But if you already have the tow package installed, wiring the controller should be as easy as locating the pigtail (most likely under the drivers seat) getting a connector and pins from the Merc Parts desk and connecting the two, if they can't help call the MB van help line. I'm currently waiting on my vehicle to show up but also have a need for the brake controller as well. I had a nice talk with the sprinter help line on this last week because no one has the information in their systems yet. It appears that the tow package is pretty much the same setup as the sprinter. +1 for the Tekonsha products. I had a Prodigy P2 in my last van and will probably go for a P3 in the Metris.
 

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After going back and forth with the parts desk about these parts being compatible I just called the Sprinter Line and again and asked for the pn's to wire to the trailer brake pigtail. Here's what MBUSA sent:

1 Connector Housing A039 545 35 28
1 Pin 0.75 mm A046 545 40 28
3 Pin 2.5 mm A035 545 74 28

I'm also being told that there should be a green connector, the same as the sprinter, under the driving seat. I can't seem to find it. Anyone with a tow kit have the connector under the seat?
 

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well, will be back on the phone to mbusa tomorrow. finally had the time to look under the dash and pull some panels and all but nothing. figured I'd just try and ring the wires out from the trailer and what do I find, nothing, no wires for the electronic brakes at the 7 pin connector. not really happy about this and feeling like MB doesn't really have a clue what they are selling since I've been on the phone several times and keep getting told the wires are there even though they can't be cause there isn't even the wiring at the trailer connector. will hold off on any further updates until I have a concrete answer on this.
 

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A check of my cars wiring socket does indicate a wiring loom heading off the socket. Where it leads or what it does is not clear to me yet.
 

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A check of my cars wiring socket does indicate a wiring loom heading off the socket. Where it leads or what it does is not clear to me yet.
I've got wires at the trailer connector. But all they've done is wired the 7 pin connector with the normal 4 pin trailer feed plus an aux. power. Since the vehicle is equipped with a 7 pin connector it's reasonable to expect it to come fully supported which mine is obviously not atm.
 

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Discussion Starter #9
After going back and forth with the parts desk about these parts being compatible I just called the Sprinter Line and again and asked for the pn's to wire to the trailer brake pigtail. Here's what MBUSA sent:

1 Connector Housing A039 545 35 28
1 Pin 0.75 mm A046 545 40 28
3 Pin 2.5 mm A035 545 74 28

I'm also being told that there should be a green connector, the same as the sprinter, under the driving seat. I can't seem to find it. Anyone with a tow kit have the connector under the seat?
I have the factory tow package but I couldn't find the green connector in the driver seat box either. I looked around for a bit but couldn't find anything either. I looked at the 7 pin connector in the back and there are only 6 wires connected back there.
 

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I was waiting to reply until I got a solution, but I actually got a call back from MBusa yesterday with some disappointing news. After checking with their engineering team (not sure who those people are) they were told that the Metris is not being manufactured with support for electric brakes. The reason I was waiting is that MB is looking into getting a solution which I don't have right now. I will post as soon as I have more info. In the mean time, anyone that needs electric brakes should call into the sprinter help line and let them know we need a solution for this.
 

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Styles, or any one else have you heard from MB yet with a fix? I went to two dealers for answers. First one assigned a nice service tech who didn't know anything about it but wanted to find out. He emailed me some ideas on where to look and none of them panned out. I found the brake controller in the right rear side. 5 wires coming out of it going to the tail lights and an unused 8 plug opening. The 7 plug is wired for a 4 plug with a hot lead. Maybe for a surge brake control? Then he quit answering me, I guess he found out the truth and was afraid to let me know.
The second dealer, the one I bought it from told be I needed to go to a trailer shop to have it wired. I let them know that I paid for a towing package with a 7 pin connector so I wouldn't have to wire it myself and reminded them when I was researching the vehicle with them I would not buy a Metris unless it was ready to tow. Then I was assigned to the service manager who said he would let me know the answer. He called later to tell me MB's answer was they don't wire for trailer brakes with a 7 pin connector, asked why not they said that's how they do things. I asked the manager if it was fair to sell me something under false pretense and he said no and there is really nothing I can do about it.
A call to MB got me the same answer, that's how we do things and there is nothing they can do, I am on my own to fix the problem.
So, I bought the Metris to haul motorcycles in, and there has been a lot of interest in the van everywhere I go with people looking at it for the same use. But I will do my darndest to talk anyone out of buying a MB product as long as I am alive. It is all I can do about it.
 

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Unfortunately I'm at a dead end at the moment as well. I followed up with my dealer last week who was supposed to have been working with MB engineering to get a solution but MB keeps coming back with "it was manufactured as designed". I need to follow up with Sprinter Line this week, I pm'd you the guy I've been dealing with, the more people that complain the faster they'll make this right. Any Joe off the street is going to walk up to one of these on the lot, see the hitch, see the 7 pin connector, see where it says "electric brakes" on the connector cover and come the conclusion that it supports brakes from the factory. Any modern pickup or van comes prewired for a controller. I bought mine to haul the family and a race car around every so often, my trailer has electric brakes and I'd rather not replace it with surge brakes.

All I really need from MB is a good place to get the brake activation up front. The +12 can come from the aux box in the passenger footwell. I don't know if the brake switch on the pedal is just a switch or a sensor cause I think it can sense the amount of braking for the start/stop. That and some pins and connectors and we should be in business but MB really needs to be the ones supplying the parts. I'll even write the TSB for them if I have to.
 

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Wow, this is disappointing. Glad to learn this before pursuing a two axle cargo trailer and our a travel trailer.

Wonder why mb is promoting the five thousand tire capacity if the most you can pull is a 5x8 single axle trailer with no electric brakes...

Thanks Styles
 

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What I'm being told it there is not an official way from MB to add electric trailer brakes to the Metris atm. They are? working on something but I am waiting to see if my service desk can get an eta on the solution before I try the unofficial solution. The unofficial solution appears to be the Prodigy RF http://www.tekonsha.com/products/brake-controllers/proportional-controllers/prodigy-rf/TzaIxkVx1cI5XOy!osRB508pViEKmVBf which seems like a nice unit but

If you look through the reviews of the RF there are a lot of ML350 owners so maybe the "we don't need to wire for brakes" attitude is institutional.
http://www.tekonsha.com/products/brake-controllers/proportional-controllers/prodigy-rf/TzaIxkVx1cI5XOy!osRB508pViEKmVBf
 

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That is one option I was looking at along with this.
http://intelli-hitch.com/
I have been told by a few people that they don't use electric trailer brakes in Europe but use the proportional valve set ups. That's why they wire in a four way plug with a hot wire from the battery. My question is do I sent the bill for the hitch to my dealer or MB America since they sold be a vehicle they stated was ready to tow 5000 pounds. As the van sits now it would be illegal to tow a lot less weight in every state. I wish I would have known all this before I bought the van.
This whole experance has been a lot like when the Sprinters came to the MB dealers, they were glad to take your money but didn't want anything to do with you after the sale. It didn't change until the dealers discovered how much money they could make keeping the Sprinters running when they went out of warranty.
 

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Not sure the intelli hitch will work well on the Metris. It looks like it hangs pretty low, I'd be concerned with hitting it on the ground since the hitch is so low as it is.
As for MB picking up the bill: I wasn't told they wouldn't when I suggested they should at least be paying the difference between it and something like a P3 controller. But you'll probably have to call and complain before they are willing to do anything. I'm still waiting on hearing if there is an actual eta on the mystical solution before I go with the ProdigyRF.

MB should really know better, there are several TSB's out for fitting the Sprinters and other vehicles with electric brakes. I would have liked to have known as well but my dealer knew nothing about the vehicle, even MB was telling me for a month that brakes were supported before they figured it out.
 

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Discussion Starter #19

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Just want to give you guys an update. I have been towing my race car trailer since May and have been really satisfied with the result, using the Prodigy RF Wireless Brake Conrtoller. https://www.amazon.com/Tekonsha-90250-Prodigy-Electronic-Control/dp/B001P0ZA86/ref=sr_1_1?ie=UTF8&qid=1466779615&sr=8-1&keywords=prodigy+RF
It's pretty much just plug and play, no installation required and works beautifully with the metris.
good to hear. any idea what kind of weight you are dragging around? How are the mpgs towing? also what kind of trailer do you have? I've got a homemade 2 axle 18ft (1600lbs plus 2500lb race car - have not towed yet) and am seriously thinking about replacing it with an Aluma 7814R for the lower deck and lighter weight. I've got to run a 1.5" rise to get the trailer level as it is now. I'm interested in your setup.
 
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