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Can you add hitch to factory SAM unit?

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Old Dec 27, 2014 | 10:38 AM
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2011 ML350 4Matic LOADED, 2009 Saab 9-3 turbo, 2012 Honda Accord
Can you add hitch to factory SAM unit?
I am going to intall a OEM hitch on our 2011 ML350 4matic. I found the factory hitch from ECS tuning online for $300 less than my dealer, but have a few questions about wiring.
I am going to get the wiring harness and hitch socket, but will I need a new SAM? Can I just plug the harness into my current factory SAM and have the dealer re-configure it?
Or will I need to buy a completely new one? I would love to save the extra $350 by using my current one.

Thanks everyone.

SAM:
http://www.ecstuning.com/Mercedes_Be...SAM/ES2188537/

Hitch:
http://www.ecstuning.com/Mercedes_Be...tch/ES2222409/

Harness:
http://www.ecstuning.com/Mercedes_Be...tch/ES1697533/
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