Originally Posted by cmarshack

Thanks for all the info here and I am sure I will have more questions when my hitch gets here, but first question is:

Can I re-use the bolts that hold the non-hitch bumper reinforcement when installing the tow bar? I bought one from a salvage yard and it will likely not show up with the mounting bolts. I want to order them before I get into the job if i cannot re-use the ones holding the old part in place.

Originally Posted by GTPlus

No, you can not use the non-hitch bolts. They are much shorter.


I ordered PN N91029202 for my 2011 Q7


https://www.ecstuning.com/ES471648/

Originally Posted by cmarshack

That is what I suspected...thanks for validating!

Originally Posted by Chrisw83

Do you have the trailer module already installed? You might need that as well. I will be installing my hitch this weekend. Take pictures and post them when you get done!

Originally Posted by cmarshack

I do not have the module already installed and might have to add that after the fact...I am waiting to see what shows up with my hitch before I buy a module. I am hoping they send it with the harness, but either way I got a very good deal on the hitch and wire harness.

I will take pics when i do my install, if anyone has anything they want me to highlight that is not already covered in this tread...now it the time.

Originally Posted by pcoliver

As Promised, here are my settings based on my 2011 Q7 features. Your changes may vary based on additional features you may have like Lane Assist and Level Lontrol.

My specific changes are in Bold underline.
Trailer Hitch Retrofitting (4L)
From Ross-Tech Wiki Configuration
The following Activations are necessary to ensure that the newly fitted parts are properly recognized and are ready to use.

1-Update the Installation List in the Gateway (J533 / #19). Register the newly added 69 - Trailer Control Module via the Installation List Function. (I just checked the “Trailer” check box)
2-Update the Trailer Control Module (J345 / #69) Coding.(I set mine to “2”)-Not all Retrofitting Kits contain Diagnostic capable Trailer Control Modules, some Aftermarket Modules may even be pre-coded. This Step can be ignored for Modules which are not Diagnostic capable. Due to different Control Modules and Equipment in the Car the actual Coding Table is not shown here but will automatically be used by the Long Coding Assistant once you access the Function using VCDS. If an Aftermarket Module is installed, check the Retrofitting Kit for further Instructions.
3-Update the Engine Control Module (J623 / #01) Coding. (not applicable to my Q7)
 Make sure that the Engine is NOT running, otherwise the new Coding will be rejected. Models equipped with Start/Stop System do have a Shutoff Switch/Button which will deactivate the Start/Stop Function.
 For Engines with a 2nd Engine Control Module (J624 / #11) this needs to be coded as well.
 As a Rule of Thumb, If the Engine uses conventional Short Coding (Coding is 7-digits like 0011312) the Long Codding Assistant does NOT apply. Modules using Short Coding typically do NOT support or require Trailer Configuration Coding. If the Engine Control Module uses a Long Coding the Activation is done in (Long) Coding itself through via Coding Assist. Please also note that there are different Coding Variants for Long Coding.
 Due to different Control Modules and Equipment in the Car the actual Coding Table is not shown here but will automatically be used by the Long Coding Assistant once you access the Function using VCDS.
4-Update the Brake Electronics (J104 / #03) Configuration. (Did not change anything here)
 To enable the Trailer Stabilization Subtract 0000016 from the existing Coding (e.g. 0033937 - 0000016 = 0033921).
 Additional Information may be shown once you access the Coding Function using VCDS.
5-Update the Level Control (J197 / #34) Coding, if installed. (Not applicable to my Q7)
 Due to different Control Modules and Equipment in the Car the actual Coding Table is not shown here but will automatically be shown once you access the Function using VCDS.
6-Update the Parking Aid (J446 / #76) Coding, if installed. ( initial setting was 0221266 and changed it to 0231266)
 Due to different Control Modules and Equipment in the Car the actual Coding Table is not shown here but will automatically be shown once you access the Function using VCDS.
7-Update the Rear View Camera (J772 / #6C) Coding, if installed. (initial setting was 1021101 and changed it to 1031101)
 Due to different Control Modules and Equipment in the Car the actual Coding Table is not shown here but will automatically be displayed once you access the Coding Function using VCDS.
8-Update the Lane Change Assist (J769 / #3C) Coding, if installed. (not applicable to my Q7)
 Due to different Control Modules and Equipment in the Car the actual Coding Table is not shown here but will automatically be displayed once you access the Coding Function using VCDS.
9-Update the Distance Regulation (J428 / #13) Coding, if installed. (not applicable to my Q7)
 Due to different Control Modules and Equipment in the Car the actual Coding Table is not shown here but will automatically be displayed once you access the Coding Function using VCDS.

Originally Posted by Greystoke

I believe the vehicle must sense the attached trailer wiring before it applies full power from the module.

Grey