heated seat wiring

[beanie]

Does anyone know how the 5 wires match up on the heated seat ? Mine has 3 black and 2 striped . But the connection plug only has a 3 pin hookup. Wiring diagram does not make cents of this ? Seems to have one heavier gauge black and 2 lighter but all same color? Any further ideas are much appreciated?

 

[stgdz]

I believe three of the blacks are spliced together