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You don’t? Aircraft with uninstalled options for sure have the wiring pre incorporated in the loom - which is for the time being non functional.
On new build aircraft, the wiring for uninstalled options will often be deleted during build to save weight (wire bundles are not mass produced in the way that automotive wiring is). However it's not uncommon for wiring to be 'capped and stowed' when optional equipment is deactivated (often occurs when aircraft change hands and the new operator wants a standard configuration).