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  #11  
Old 05-28-2021, 05:29 PM
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I am a bit confused.
There are only 2 plugs one end into the module, the other end to the trailer. Does the module itself plug into a third one that's already in the car? Otherwise how does the brake signal go to the module?

Also what does the module do? Is it the OEM version of the Tekonsha that LVP mentioned above? Or do I still need a brake controller for braked trailers?
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  #12  
Old 05-28-2021, 06:39 PM
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Quote:
Originally Posted by Perrier View Post
I am a bit confused.
There are only 2 plugs one end into the module, the other end to the trailer. Does the module itself plug into a third one that's already in the car? Otherwise how does the brake signal go to the module?

Also what does the module do? Is it the OEM version of the Tekonsha that LVP mentioned above? Or do I still need a brake controller for braked trailers?
The E53 X5 comes pre-wired from the factory to accept harness and module.

There are two plugs below the rear cargo tray:

one, on the outside of the battery cover, where the trailer module plugs into

another just below the rear tailgate that takes one end of the 4 foot long trailer harness that is routed into the body thru a hole with a grommet.

The Trailer module tells the E53's computers that the trailer option has been installed.
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  #13  
Old 05-28-2021, 07:14 PM
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Yep, I can confirm that the ebay item is all you need -- HOWEVER, it does not include a trailer brake controller, which you must buy aftermarket. No OEM brake controller was ever offered from BMW.



Tekonsha makes good quality controllers. I don't know if the wireless is justified unless that is what you want. I used a Tekonsha P3 which is a wired, proportional controller.
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  #14  
Old 05-28-2021, 07:14 PM
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Ok that makes sense. Thank you.

What kind of gas consumption have you guys experienced? I will be buying a 6x12 v-nose enclosed trailer, single axle. I know it depends on many factors, but what has been the average increase in gas consumption?
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  #15  
Old 05-29-2021, 11:23 AM
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Search for a thread on the topic a handful of people posted their fuel economy with similar trailers. The thread was maybe 12-18 months ago.
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  #16  
Old 05-29-2021, 12:24 PM
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How much will it weigh when loaded? I have done as high as 14 mpg but typically average in between 12-13. My trailer is a full-width Apex Nano which weighs 3,000 lbs unloaded and I typically have the trailer and car loaded up pretty good with water and camping gear.

My car is a 5MT 3.0i for reference.
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  #17  
Old 05-29-2021, 10:02 PM
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Originally Posted by Bdc101 View Post
How much will it weigh when loaded? I have done as high as 14 mpg but typically average in between 12-13. My trailer is a full-width Apex Nano which weighs 3,000 lbs unloaded and I typically have the trailer and car loaded up pretty good with water and camping gear.

My car is a 5MT 3.0i for reference.
Thanks makes me feel safe. Mine is aluminum weighs 800lbs empty, and should be about 2500 loaded.
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  #18  
Old 05-29-2021, 10:27 PM
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Yeah, you should be in good shape, especially if it's an aerodynamic shape.
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  #19  
Old 05-30-2021, 07:29 PM
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I have now installed the OEM trailer control module, and the wire harness. Checked fuse box and #78 20A fuse is already present and good.

The OEM wire harness is a 7pin round plug with labels imprinted on the cover for each pin. One of them is Electric Brakes.

I thought we need a separate unit for brake control!
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  #20  
Old 05-30-2021, 09:09 PM
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You do. The connector has a pin for the brake circuit, as all 7-pin connectors do, but the car was not equipped with one from the factory.
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