wire harness help

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89hatchd15b

now its a 91
I have a 91 civic dx hb that i am swapping the wire harness from a 89 civic si. I am also going to swap in a jdm d15b. But right now my question is what is the little grey box to the right of the exaporator under the dash? This box isn't on the 89 si and the harness doesn't have a plug for it. will this cause any issues?
Thanks!!
 
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