8 way seats - Need help
 

Just scored some 8 way powered seats and need some help. From the main connector (4 prong) there are 3 wires coming out. Black/yellow(???), brown (ground) red/black (12+). Seat moves in all directions except for 2.

First question - What is the black/yellow wire for?
Switch question - 2nd switch, one towards the back of the seat. Going left or right, what is that suppossed to do? This is the 2 directions that dont work.

Thanks

black/yellow wire is for the seat heater
And that switch that doesn't work is for backrest control
I recently repair the switch on my 86 951

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Bud