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Heated Seats issue

jojotheclown

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Year, Model & Trim Level
2003 Explorer
So long story short I bought a full set of seats out of a Limited to get the 3rd row. The bonus was the new seats were heated and I'm trying to get them to work.
I have constant power, ign on power and the ground all connected. I'm trying to figure out what signal the heated set module under the seat is expecting from the EATC Electronic Automatic Temperature Control Module.
I tried grounding it, no go. I don't want to just try 12v since that might fry the module.

Here is a wiring diagram of the wire and signal I'm trying to figure out.

HeatedSeat.gif
 



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The EATC does not provide a signal to the heated seat module. It's the other way around. The EATC displays an icon that the heated seat is turned on.
 






The EATC does not provide a signal to the heated seat module. It's the other way around. The EATC displays an icon that the heated seat is turned on.

Thanks. Back to the drawing board I guess. The heat worked before taking it out of the donor, so I have to figure out why it doesn't now. Assumed that it needed something on that wire.
 






are the seats from the same model year as yours?

if the wire is used to signal (or power) an indicator on the eatc, your eatc will need to be that same model eatc as the donor vehicle

but it looks to me like the heater should operate without that wire connected

is the wire og? is there an og wire in the eatc harness?
 






are the seats from the same model year as yours?

if the wire is used to signal (or power) an indicator on the eatc, your eatc will need to be that same model eatc as the donor vehicle

but it looks to me like the heater should operate without that wire connected

is the wire og? is there an og wire in the eatc harness?

No my truck is a basic 03, no EATC.
Thats why I'm puzzled as to why the heat is not working.

I have Pins 1,5, and 12 to the appropriate sources.

Just came back from checking it again. The pins are correct.
One thing I noticed was that when it's all connected I don't have power on pin 8 of the module. Based on the diagram I'd assume there was always power on that pin. Tried it with both modules I have.
 






I would use a test light between pin 12 and ground. This way you can see what the module is trying to do. Sometimes it's a little hard to tell if the seat heaters have really kicked on.

As for pin 8 it will not have voltage. Otherwise it would short straight to ground when you push the button.
 






JoJo, i can post some stuff tomorrow that might help you out.
 






Jojo, I do have the Ford wiring diagram for the 2004 model year. There is no heated seat module for 2004, it is a much simpler circuit. Fuse to switch, switch to seat, seat to back cushion, back cushion to ground. A parallel circuit taps off after the switch to the EATC. It receives the 12 VDC. So if 2003 was anything close, then the EATC would have expected 12 VDC and the module would be putting out 12 VDC on pin 10. Unfortunately, by you grounding that a problem may have arose. Have you gone back and checked still 12 VDC coming in to terminals 12 and 5?
 






Thanks for the help guys.

The modules are working. I check pin 6 and it has power, not sure why it didn't click to check that first, guess I'm rusty.

I suppose since these are older I didn't wait long enough for them to get warm.
 






Glad you got it sorted & thanks for the update!!
 






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