Multiple accessory install question

Hi all, looking to install heated grips on our TRX420FA6. Had the dealer install the winch before picking it up and after some cool riding last year wanted to add the Honda heated grips. I've followed the install instructions so far without an issue but not sure where to connect the heated grips sub-harness to the accessory sub-harness that is already installed for the winch. Description says you can install winch and or heated grips with the accessory sub harness but at a loss on how to connect. Are you supposed to splice in the heated grips somehow?

Thanks in advance.

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