FORD Escape 2010 or 2009 Speaker Wire Code!?

Please Help me! I need to wire the SUBWOOFER to my rear Door speakers.
I was able to pull the trims between front and rear doors inside the car. But now Now I need to findout what color cables go to Rear Left speaker and Rear Right Speaker.
Please Help!

I have phoned FORD PARTS and they told me that
Left Rear POS: is Brown/White
Left Rear NEG: is Brown BU (What is BU????)

Right Rear POS: BROWN
Right Rear NEG: Brown BU ( what color is BU???)

Please help!
Thank You
 
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