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  #1  
Old Yesterday, 12:12 AM
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Help needed, pictures of AHM hitch harness connections.

Fellow E70 owners!

Please, anyone who installed the OEM hitch harness and AHM module, I am trying to understand how the AHM and the hitch harness connects to the E70. I recently bought a used OEM hitch and AHM module for the X5, but the harness connector to the AHM had been cut off. Since there is only one port on the AHM I take it that the harness has more than one connector, the one to the module and another to the vehicle, presumably the CAN bus. The harness did come with one small connector that look like it connects to the PDC sensor but I don't understand why that would be the case. Soon I should get delivery of a plug connecting to the AHM, I bought a used pigtail but I realized that I am possibly still missing a plug to connect to the bus. Anyone who installed the OEM kit, it would be really helpful if you could post or PM me some pictures of the various items the harness connects to.
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2003 4.4i black ext./black int./black headliner (kid's runabout)
2009 E70 35d, black ext./black int./black headliner (grocery-getter and general runabout, 2b4sale soon)
2006 4.8iS Le Mans blue/cream int./black headliner, SOLD in 2012 sadly...

Hmmmm, love those black headliners!

Other hardware:
2005 Tundra crew cab, weekend hauler. Sold
2015 Cayenne S (wife's new DD and definitely wroooommmmm)
2016 Tundra 1794 edition crew cab, luxo hauler
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Old Yesterday, 03:19 PM
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Attaching to the pdc system prob to communicate to the car to not beep the PDC when trailer attached.
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Old Today, 10:09 AM
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Found a good schematic, thx to PAX5

The instructions in Ista are very limited. I was hoping to find the complete retrofit guide but apparently no such thing. Found the wiring assignments in Ista, going try make some sense of it today.

Intercepting the reverse signal at the hitch socket is counter-intuitive as the trailer module and the PDC module neighbor each other in the trunk I think. If the sensor wire connected to this plug, there would be no connection to the actual sensor in the bumper. Could be for the auto hitch but that is not shown in the wiring diagram. EDIT: Mystery plug is for CAS antenna module.


EDIT: Found the below with a google search, Xoutpost contains so much excellent infomation :-) This is perfect, when my pigtail shows up I will disassemble the harness and discard what I don't need. The solder in the pigtail and it should be ready to code.
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2003 4.4i black ext./black int./black headliner (kid's runabout)
2009 E70 35d, black ext./black int./black headliner (grocery-getter and general runabout, 2b4sale soon)
2006 4.8iS Le Mans blue/cream int./black headliner, SOLD in 2012 sadly...

Hmmmm, love those black headliners!

Other hardware:
2005 Tundra crew cab, weekend hauler. Sold
2015 Cayenne S (wife's new DD and definitely wroooommmmm)
2016 Tundra 1794 edition crew cab, luxo hauler

Last edited by TriX5; Today at 11:18 AM.
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  #4  
Old Today, 11:02 AM
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Only thing left that I don't yet know is where the single wire connect (Blue/Brown lighting signal). Anyone?
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2003 4.4i black ext./black int./black headliner (kid's runabout)
2009 E70 35d, black ext./black int./black headliner (grocery-getter and general runabout, 2b4sale soon)
2006 4.8iS Le Mans blue/cream int./black headliner, SOLD in 2012 sadly...

Hmmmm, love those black headliners!

Other hardware:
2005 Tundra crew cab, weekend hauler. Sold
2015 Cayenne S (wife's new DD and definitely wroooommmmm)
2016 Tundra 1794 edition crew cab, luxo hauler
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  #5  
Old Today, 11:44 AM
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From the complete install instruction I received with my hitch:

14. Carefully route single blue/brown wire from
trailer wiring harness along existing
harnesses to area behind right tail light
assembly. Secure all harnesses with wire-ties
(3) & (4) from installation kit.
15. Locate and remove Connector X318 (1) from
Tail Light Assembly.
16. With connector X318 (1) removed from tail
light assembly, use BMW approved tap
connector (3) p/n 61 13 8 364 566 [included
in kit] to connect blue/brown wire from trailer
wiring harness (4) to the blue/brown wire (pin
3) in the connector. Make certain single wire
from trailer wiring harness does not protrude
from tap connector.
17. Reconnect connector X318 to tail light
assembly.
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