Brake Controller - FYI
 

Wired up a brake controller in the GLE350d
(Have the tow package)

Pretty Straight forward!, wires- Plus, Minus, Brake Signal, Brake Output.

Bought the male factory connector at dealership ($24.00) they kindda looked like I was from the moon...as they had never ever sold one before. guess Mercedes owners don't tow, splice the wires or use wireless.

I bought the Tekonsha P3,- one observation which is different from most cars I'm told, the diagnostics on these brake controllers don't work until you actually plug in a trailer. I'm guessing that has to do with the SAM module, which is part of the tow package.

Obviously you also don't want to mount a controller in the airbag area....

Can you share the MB part# for the male connector ?

Sure Can:

https://mbworld.org/forums/attachmen...rol_hookup.pdf

You buy the Plug Housing plus 4 pins (as per Star Bullitin)

The 0,75 Pin is used for the brake-light signal(from pedal) rest of wires uses the thicker pins.

What is the tow package? I've never heard of that on the GLE.

I've got a tow package on my GLE too. 2" Tow hitch receiver and electrical connections - must be a few other things.

I've got the receiver and electrical trailer hook ups too, but I didn't know that was called the tow package. When I think tow package, I think transmission cooler, different rear end gears, tow haul button to change the transmission. I've never heard MB call it a tow package on the GLE. I thought it was something new.

Your right! The option is called "trailer hitch" (Class III) and not a tow package.

I would imagine there might be an upgraded trans cooler (hopefully), but with a price tag of $575, the receiver and electronics must be all that are included.

Nookie - many thanks for the factual post - which will be a BIG help to those looking to install a wired brake controller...

Mercedes SUV's with factory "trailer hitch" package make OUTSTANDING recreational tow vehicles - just do forum search and READ outstanding comments from post from actual owner's who tow....

On MB's part - yes - MB dealer's are not as savvy as a pick-up-truck dealer when it comes to towing...

So you know - the hitch package gives you quite a bit more that "hitch" and "wiring" when it comes to towing...

Loke what ? Like ... ohh.. active trailer stabilization which I term "anti-see-saw"....

From Euro point of view:

http://techcenter.mercedes-benz.com/...on/detail.html

Translated to NA terms:

http://media.daimler.com/marsMediaSi...ml?oid=9904683

Preparing to install wiring harness on my 2017 GLE.

Does anyone know, with respect to the leads to the rear lights, are there

three: turn, brake, light, or two, with turn and brake multiplexed,
two: turn and brake multiplexed
two: brake and light multiplexed
one: brake, turn, light multiplexed
other?

Is a 3rd party brake controller required to activate electric brake on a GLE with the tow package? While servicing my trailer (with electric brakes) to get ready for use this year, I discovered it appears the trailer brakes are not being activated by the GLE 7-pin connector and GLE brake pedal depress. All other GLE 7-pin functions (power/lights/signals) are working. At first I thought I had a trailer problem, but the emergency breakaway brake control does engage the trial electric brakes. But a simple test with trailer wheels jacked up in the air and depressing GLE brake pedal does not engage/stop trailer wheels from spinning. I was under the understanding that half-ish GLE brake pedal depress-ing would "power" the trailer brakes w/o any 3rd party brake controller?

GLE service time or is a brake controller required for this function?

I thought brake controller gave more options for electric trailer braking function, but was not a minimum requirement.

2017 AMG GLE 43 - Brilliant Blue / Black Napa Leather

An aftermarket trailer brake controller on the GLEs is required to activate electric trailer brakes. The problem is finding somebody to install one, unless you go the DYI route. The dealer where I purchased my ML 350 diesel in 2012 installed (for $600!) a TBC that I provided, but the work order had a long CYA note that Mercedes would not be responsible for any warranty-related issues. I've just taken delivery of a 2018 GLE, and two local dealers now refuse to have anything to do with any aftermarket items. They suggest trying an RV dealer, but I explored that for the ML and nobody would work on MBs, and I'm reluctant to let them.

The connection is actually quite simple, as there is a prewired connector bundled underneath the dash (or the carpet, some people say). I wanted the dealer to do it because the center console cubby is a nice place to mount a low profile Tekonsha controller but requires fishing the wiring through the back of the compartment. I don't want to mess with that myself.

One workaround is a Tekonsha radio-frequency controller that utilizes a remote that sends a signal to a module mounted on the trailer tongue to set the gain and make an emergency stop if required. No hard-wiring involved. The module itself controls the trailer brakes, drawing power from the standard 7-pin receptacle.

@Shrdlu, thank you so much for the reply and clarification. This was not obvious in the GLE Manual when I read the towing section. With the help of this thread and other references, I am all in for the DIY route to try hardwired first. I will post share my results/approach once installed.

I do not know if M-Benz is unique in this approach or if this is the common way a 7-pin SUV is sold (w/o brake pin activated) by other manufactures. I was under the impression, the '03 BMW X5 M I used before the GLE AMG as a tow vehicle with 7-pin connector & electric brakes on my trailer was activating the trailer brakes w/ half pedal depression, but I do not recall running a true wheels up test on the trailer. I was under the impression, in not electric brake activation for the factory wiring harness would be a 4/5-pin connector. Given the 7-pin "typical" blue wire is for brake activation.

Found this site for online parts order: www.mbdirectparts.com they infer they have the housing and pins, with shipping, it is about $24 too.

https://cimg0.ibsrv.net/gimg/www.mbw...0e10b6e069.jpg

Can't find the parts on that site. Partially because I'm not 100% sure what I'm looking for! Can you give part numbers or a link to the page it's on?!?

Part Numbers - www.mbdirectparts.com
 

039-545-35-28 @ 1
046-545-40-28 @ 1
035-545-74-28 @ 3

I have not yet order these parts. But they seem to align with the Benz service bulletin numbers and descriptions.

I have yet to locate the Brake Controller plug in my '17 AMG GLE 43 to confirm.

Thank you so much! Greatly appreciated.

It was a struggle to find the end of the factory supplied trailer brake controller wiring on my 2017 GLS. It was even more difficult to find good information on the internet and impossible to get information from my dealer!

There is a 4 wire bundle: Larger red/white stripe and yellow/red stripe and smaller black/white stripe and brown. They are intermittently wrapped in a black cloth wrapper. There was a piece of white masking tape holding them up above the carpet.

The wire enters along the left side of the foot well and takes a path up to the top edge of the carpet and arches over to an attachment snap behind and to the right of the brake pedal assembly on the firewall. It then dives down very far under the carpet toward the gas pedal. This was much more difficult than it needed to be which is frustrating.

I was finally able to find the end by removing the trim that goes on the door sill and up to the rear of the foot well. It simply snaps off. This allowed me to pull up just enough on the carpet to free the end of the connector. This was not easy. Not being certain that the connector was there, I was afraid to pull too hard on the wire.

The path of the wire approximately follows the dashed red line on the attached document, but this is from older models.
I found this article on another site. The wires on my '18 GLE Coupe were exactly where the article says. I pulled the carpet by the brake pedal back and there they were.
Pulled them out and Voila.

So for my '17 AMG GLE the female plug above is not correct. The pins for the wires are correct. Part numbers seem to match, so not sure why the plugs didn't mate up correctly.
I ended up using chisel and Dremel (and tape & zip tie) to form a modified plug and pushed on to install the wire harness and P3. All seems to work fine in dry run (brakes on trailer now activate with manual P3 brake toggle and GLE brake pedal).

Will report back after next tow excursion with loaded trailer and final set up of P3 brake pressure.

Mounted P3 in console, had to extend P3 cable length to reach GLE plug. See photos of location. Some image/details below. Hope it helps others.
https://cimg3.ibsrv.net/gimg/www.mbw...5e69b31e8c.jpg
Trailex and '17 AMG GLE (above)
https://cimg6.ibsrv.net/gimg/www.mbw...d8c641d8ba.jpg
GLE Plug location, left upper corner of foot well. Remove 3 screws from path underside panel to reveal plug (above)
https://cimg2.ibsrv.net/gimg/www.mbw...91b6606352.jpg
P3 wire harness routing inside of car console, requires some fishing. Use 1 wire to route then pull thru bare wires before making plug connection as plug will not fit thru behind console panel space. Had to extend length of P3 cable to GLE plug when using center console location. (above) This location allows P3 to be "held" (no bracket mounting) in cubby in GLE console. Leave slack in P3 cord as to pull out P3 to plug/unplug it as needed then push cord/plug back into cubby. Since the plug is always "live" be sure to not short out exposed plug ends when not plugged into P3 (cover with tape when not in use).
30amp fuse is located under rear passenger seat. Ask me how I know this :-P
https://cimg7.ibsrv.net/gimg/www.mbw...01d017ad8a.jpg
Risking/tricky part. Need to make hole in console storage cubby (remove rubber pad to expose plastic). Note location of corner and bolt hole above for reference. 1/4" hole then enlarged with Dremel and smoothed edges to not chaff wires when moving in and out. I shrink-wrapped the last 4" of the cord to protect it. The cable goes in at an angle from right to left, 45 degrees-ish to the hole. Remember that when pulling and pushing.
https://cimg5.ibsrv.net/gimg/www.mbw...ec943cdab7.jpg
This plug saga - was very frustrating. Ordered (online - factorymoparparts.com) the plug and pins from "thread" part numbers above. The part# female (ordered part) matches the part# (male) in the '17 AMG GLE brake controller. The pins do fit/work.
The 2 plugs do not match up in shape dimensions and nub. The yellow arrows point to a nub on the GLE male plug (orange arrow below) that doesn't align with female P3 plug slot. The GLE nub is too far towards the center compared to the female nub slot opening notch.
Furthermore those internal "ribs" on the female P3 plug (left/right) need to be removed (chisel) for the male rectangle to fit inside of the female. The (red arrows) external male GLE plug latch interferes with female P3 latch).
https://cimg6.ibsrv.net/gimg/www.mbw...37078a3d0e.jpg
There has to be more to the part numbers. Maybe that secondary number 772-717.

In the end, I made the parts work with lots of mods.

Wire color connections '17 AMG GLE 43:
GLE X58/28 Plug Purpose P3 Connector
Brown [#1] Ground White (2.5mm pin)
Black/Red (or Gray) [#3] Brake Light Signal Red (0.75mm pin)
Red/White (or Red) [#2] 30 Amp Positive/Power Black (2.5mm pin)
Yellow/Red (or Yel/Wht) [#4] Brake Actuator Blue (2.5mm pin)

Hey Guys

Just read this thread and am wondering if any of you are in the LA, OC or San Diego area and know of an installer that can install my brake controller
in my 2013 ML63.

Thanks in advance
Rick

brake controller on ml350, 2014
 

hello to you,
I try to install one brake control on my ML350, 2014
I find the green connector on the driver side, but I don t have any power on it, connect my brake controller and no power, maybe some fuse ?

Just wanted to say that this was an incredibly helpful thread, particularly the post above, in installing my Tekonsha brake controller in my 2017 GLS 450! Mercedes did indeed make fishing out this cable about as hard as it could possibly have been without actually gluing the cable to the firewall. The bit above about removing the trim piece on the left wall of the foot well was absolutely crucial, and I never would have been bold enough to try it otherwise. Fairly easy to pop out, and easy to pop back into place.
I had to laugh at everyone in these threads talking about the blank looks they are getting from the dealerships about towing, this was exactly my experience as well.

I’m not usually embarrassed to ask a question, but this might be an embarrassing question. I’m thinking about buying a 2017 GLE 350 with factory tow pkg to pull a trailer. Trailer plus load is about 2800 lbs. This thread, and a couple others on this forum, have been extremely informative. Thank you to all the contributors.

A couple of entries have said that a controller is required on a GLE, even when it has a factory to package, if you want to use the brakes on a braked trailer. I’m asking for confirmation on this. Without a controller, like the P3, the GLE’s towing features will not be able to engage/control the trailer’s brakes. Period.

Thanks in advance.

Actually a good question. It is the standard and easiest way to activate the electric brakes on a typical trailer. Some how you have o provide a graduated "strength" signal to the trailer electric brakes, that complex feature is not part of the GLE wiring.

The Prodigy allows for adjusting to the type of trailer (weight) being towed. There is no one size fits all solution that MB could make "standard" so you need to add that to the installation yourself.

Electric brakes are the best/safest trailer option, but mechanical surge brakes are another less effective path that do not require a P3 to operate (think U-Haul, etc).

https://www.etrailer.com/question-176086.html

Definitely the controller is required in addition to the towing package.
I'm not sure if you're actually required by law in all states to have braking on a trailer under 3000 pounds, but I have a trailer that is exactly the same dry weight as yours, and I'm very happy to have the trailer braking. The GLS performs REALLY well with that size trailer, I think you'll be pleased.
The installation was a bit of a pain, and had to track down the correct connection adapter, but I think if you read the various installation comments above it'll go pretty quick.
Happy trails!

Yes, the 2017 GLE 350 is an excellent towing machine. I tow a 3,500 boat/trailer and the vehicle is excellent. No weight distributing hitch, no electric brakes are needed for this amount of weight. I have no hesitation or equivocation about saying this.

Electric brakes will likely come installed on whatever equipment you are towing. For example a recreational vehicle. A third party electric brake controller is needed to operate electric trailer brakes. Hydraulic surge brakes are more common on heavy boat trailers. No third party controller is needed for hydraulic surge brakes.

Thank you thank you thank you. This forum has been a great source of info. You are a terrific community.

Sorry I just noticed that you were talking about the 2017 GLE not the 2017 GLS. So I can't say from direct experience that the GLE doesn't have a brake controller, but the GLS towing package definitely didn't.

No problem...I’m confident the the same is true for GLE. Thanks.

I use the Tekonsha P3 for controlling the electric brakes on our Grey Wolf camper at close to 5300 lbs loaded. With the Tekonsha pigtail connector plugging into the MB harness, it’s easy to control electric trailer brakes.

As mentioned, without a brake control either not needed or required, then you’re only stopping with vehicle brakes.

For camper towing if you’re interested: https://mbworld.org/forums/gle-class...gle-350-a.html

Pigtail connector
 

Do you have a part number (name, where you got it) for this connector? I'm looking at a square green connector at the car side and need a to connect the brake controller, which requires a 4 pin flat piece.

Connection adapter
 

[

Which connection adapter ended up working for you? I've followed the posts, I didn't see a simple connection piece. Just need something from the green connector, which I found thanks to the helpful comments on this thread to the flat four pin in my tekonsha.

QUOTE=Drh02909;8207729]Definitely the controller is required in addition to the towing package.
I'm not sure if you're actually required by law in all states to have braking on a trailer under 3000 pounds, but I have a trailer that is exactly the same dry weight as yours, and I'm very happy to have the trailer braking. The GLS performs REALLY well with that size trailer, I think you'll be pleased.
The installation was a bit of a pain, and had to track down the correct connection adapter, but I think if you read the various installation comments above it'll go pretty quick.
Happy trails![/QUOTE]

[/QUOTE]
Hi
Just looked for you, the tag on the cable is 3066-P. My car is a 2017 GLS 450 . If I remember right the green to green connection was a VERY tight fit.
Good luck, hope it works out!

Thanks
 

Hi
Just looked for you, the tag on the cable is 3066-P. My car is a 2017 GLS 450 . If I remember right the green to green connection was a VERY tight fit.
Good luck, hope it works out![/QUOTE]

THANK YOU so much!!! I don't know why Amazon... and even the Tekononsha website says that connector won't work on the MB - as it LOOKS like it will work no problem. I will grab the 3066-P connector!

THANK YOU so much!!! I don't know why Amazon... and even the Tekononsha website says that connector won't work on the MB - as it LOOKS like it will work no problem. I will grab the 3066-P connector![/QUOTE]

Contact etrailer.com. I used the 3066-P in my GLE350 and their website shows it fits my vehicle, but not a GLS450. Certain vehicles may not have the same green connector somewhere behind the brake pedal to connect the pigtail adapter to.
The etrailer.com website has a fit guide to confirm what fits a particular vehicle.

Contact etrailer.com. I used the 3066-P in my GLE350 and their website shows it fits my vehicle, but not a GLS450. Certain vehicles may not have the same green connector somewhere behind the brake pedal to connect the pigtail adapter to.
The etrailer.com website has a fit guide to confirm what fits a particular vehicle.[/QUOTE]
Right I have a gls, you I think have a GLE I don't want to steer you wrong

Right I have a gls, you I think have a GLE I don't want to steer you wrong[/QUOTE]
I've heard that etrailer is great but I definitely have the 3066-P and I definitely have a GLS 450
https://cimg1.ibsrv.net/gimg/www.mbw...ec1b523c74.jpg

Could not find connector in 2022 GLE
 

Just got GLE with trailer hitch, I opened the cover under the dashboard and only see bunch of lines on left side wall. I do not see any green connector. Any idea where I can find it?
https://cimg6.ibsrv.net/gimg/www.mbw...d89619a972.jpg
Under the dashboard and left side of the brake. Next to the wall.

@GLE22User You have the latest V167 GLE. The section you have posted in is for the prior model W166 GLE. Try posting in the V167 section, this topic has come up many times.

Old topic, so needs some updates.
I bought the harness at As for plug on the car, it is tricky. The cable to the plug is attached in left upper corner in driver footwell, but about 16" of cable with the plug is simply dropped behind the padding and in my case the plug was about the center, behind the pedal, but loose cable can end anywhere.
I had to pull the padding pretty hard to find it.