Sensing switch closure that is part of a large switch matrix

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i need sense multiple switch closures externally circuit in operation.

one lead +5vdc strobe , other lead return, both originating on cpu.  switch part of large switch matrix strobes columns , returns rows.

naturally sense circuit must not result in false switch closure nor cause inability of
the matrix circuit detect switch closure.

for reason in fog on solution problem.

original image:

you don't show enough detail there. helpful know how many wires going switch matrix , how many switches. manufactured product can model number online? can post photo?

it doesn't seem impossible on first look. might difficult or might easy.


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