Alright it gets complicated...
I'm assuming you have a 4L (2005-2015) model.
It will be in the under bonnet (hood) relay panel.
It can be any two of five relays depending on engine and year!
For petrol engine models up to June 2009 it's relays A1 and A2.
For petrol engine models from June 2009 it's relays A5 and A6.
For diesel engine models (3.0 and 4.2) it's relays A5 and A6.
For diesel engine models (6.0 V12) it's relays A2 and A4.
For all fuse and relay information (RHD & LHD) see here:
http://knigaproavto.ru/shemy/en/audi/q7/179-audi-q7-fuse-box-diagram-4l-2005-2015.html
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