The deactivation setup is like an additional seatbelt centered under the passenger seat. The deactivation buckle (male piece) originally would have come with a child seat but the buckle can be cut off the child seat and plugged into the deactivation bar/female recepacle without the seat present. On the car you drove, either somebody rigged something non-standard, or the bar/buckle were present under the passenger seat and you didn't notice.
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