Wiring heated lumbar seats from 2005 Explorer Sport Trac

[Vamirr]

Hey guys,

I'm running into an issue as I'm wiring these explorer seats in my ranger.

The wiring harness seems to work like this:

Green - motors (power always on)
Yellow/Light Green - heated seats (power to swiched)
Red/Black - heated seat switch light (power to switched)
Black - ground
Yellow/Grey - ????

I'm not sure what the yellow/grey wire does. It's not present on the passenger side. On the driver side, it switches a relay.

Any ideas?

 

[adsm08]

Grey and yellow is power into the coil for the heated seat relay.

 

[Vamirr]

Grey and yellow is power into the coil for the heated seat relay.

This driver's seat is driving me nuts.

Here's how I've got things wired right now:
Yellow/Grey - seat relay coil (switched power)
Green - motors (power always on)
Yellow/Light Green (larger gauge) - heated seats (swiched power)
Red/Black - heated seat switch light (switched power)
Black - ground

When the truck is off, the motors work, the switch lights and heated seats don't; everything is normal.

When the truck is on, the motors work, the switch lights and the heated seats work; everything is normal.

When I turn the truck back off, everything still works. switch lights and heated seats included. I have to kill the power at the battery for everything to reset again.

If I disconnect the seat relay wire, everything seems to operate as expected. So what is that thing doing? How is it supposed to be wired if not to switched power?