Turning off AWB balance on 7d ?

You don't. You need white balance in order to take a picture.

Curious, what are you hoping to achieve should you be able to turn it off?
 
Just pick a white balance rather than let the camera decide, I have mine set to daylight, but as I shoot RAW, I get to change it in DPP later if I need to.
 
If you shoot raw then the WB setting is just a piece of metadata that the viewer uses to render the colours.

I would suggest that you set the WB to a constant (daylight/tungsten/flash etc) dependant on what you are shooting, shoot raw and make any fine adjustments in PP.

Cheers !
 
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