I have to admit I haven't messed with these newer seats, but looking at the diagram, it looks to me like the box in the middle is the power module that actually controls the power to the heating elements, and the box the left called the EATC is the brains that controls the power module. If that is the case, then it's probably not going to work without the EATC module.

The power module box recieves the signals from the heat sensor. Does it transfer this info to the EATC? I am not sure about that either but it is possible.

 

Thanks Franklin for responding to this

your right about what the boxes in the diagram are.
the module is already wired into the heating element and sensors in the seat and the module does communicate back and forth with the EATC from what i can tell by the back and forth arrows I think.
I was hoping to find out if it was necessary to have the EATC since it is only the heat controls and so, with just the modules and the sensors in the seat and a switch be able to use them, instead of having them integrated into the whole Heating and AC system via the EACT

 

I installed leather heated / power Lariat seats in my 04 XLT. Did not use a diagram, went by trial and error. Seats have run fine for 2 years. This year both switches on the heaters are stuck on. I think there might be a slight voltage issue. might need a voltage regulator? Switches for an 04 are $40 yours are probably more. I had a bunch of wires also but just ran power and ground. I figured the others were inteface with systems I dont have. I'm just going to replace the switches nd keep going.

 

So Voltage regulator?
ok. I got the 2006/07 f150 king ranch seats installed in my 99 f250 SD non power anything and they work good, still would like the heat and memory if possible.
lots of the wires are interface. i guess im gonna have to do the same and try a set up and see what happens but i just didn't want to fry things out

 

I don't see how you guys are going to get all the features of these seats without the brain control boxes to run them. Most of the diagrams I have looked at for you all through the past years show a box that controls the seats, and I assume they are mounted underneath or on the seat somewhere. The memory feature would need a box to contain the memory and the controls correct?

Did you re-wire some circuits to go directly through your switches? Possibly the switches are not rated to handle the current of the motor? Just throwing that out there, I only have diagrams to about 2003.

 

Have you guys had any more luck with the heated seats? I just bought a set of '03 Lariat seats and would like to get the heat working. I noticed my driver's side has a heat module mounted underneath. There is a on/off switch on the side of the seat. If the switch isn't rated for the load of the elements then maybe a relay is in order.

 

Here's a 2003 diagram. You can see they have key-on power and hot all the time power with a very large fuse. I am sure the very large fused circuit powers the heating elements, but it's hooked directly to the battery. That means the module is what controls the heating elements, not a switch you add. That could explain why a switch not rated very high would not last if you are switching the heating elements directly.

 

Thanks for the diagram.

So if I understand this diagram correctly I can connect the two 12v sources to the control module under the seat the system should work. Is it really that simple?

I noticed the diagram says 250 and above. My seats are from a 150. Is the wiring the same?

 

Yes, if you have the module it should be that easy. Go check your seat. If the wiring colors seem to jive, it should be correct. If they don't seem to be the same, go to autozone's site and look for another diagram, I think there was another one in there.

 

Thanks. I checked under the seats and the heat control module is there. I'm picking up the seats tomorrow and I'll check the wire colors.