MauraderMike;
Entering the post somewhat late; however, the wiring diagram I have indicates, as stated above, the Y/BK wire is to the passenger retractor switch. A R/BK wire is to the passenger side seat sensor switch. A Y wire and a R wire is to the driver side retractor and seat sensor switch respectively. The BK wire that pigtails out shows it grounding both seat sensor switches, the cigar lighter, and the combo parking brake warning switch/seat belt warning switch. My diagram shows a blue (B) wire and an orange (O) wire going to the cigar lighter as well as the aforementioned BK pigtail. Unfortunately, my wiring diagrams are not dated to verify what year wiring diagram I have.
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