Heated/cooled seat mystery

[pilot650]

I have a 2014 Limited. Heat/cool seats were working fine. Changed the radio, just the head unit, never unplugged the HVAC controls, and now the front do not work. Not sure if SYNC has anything to do with the heat/cool seats but there is a SYNC wire for the new head unit that I did not connect, supposedly for steering wheel controls which are already working due to the maestro interface and harness.

Back to the seats... Checked and all fuses are good (40a under hood and the two for rear seat heat in the passenger side). Checked the module and the ground plug was melted. Strange coincidence. Replaced the pigtail and a new module. Still don't work. I have ordered a new HVAC control for the dash to see if for some reason that went bad too but seems unlikely. What else is there? Impossible/not worth trying to trace and test the 30 or so wires coming out of the seat heat module.

I don't think the radio has anything to do with it, but that was what was going on when this chain of events began.

 

[Gumbyalso]

Sorry to see no one has responded yet. I have an '11 and don't know if this will apply to a '14. I had the climate control seat module and connector replaced in Dec 2015. The original ground was a bad actor in the '11 and may have been in the '14. Unfortunately it smoked the climate control seat module and connector when it shorted. The connector and module both had burn marks. The grounding was improved, maybe by a TSP. Also unfortunately, the seat module has to be programmed by the dealer - at least that was so in 2015. That's why I had them do the work instead of me. Later I replaced three of the Heated Cooled Seat Cushion Blower Motor Climate Modules (TEDs) when they wore out. The are not very reliable and run $350 - $400 so I finally quit replacing them. I have 304k on the '11 now. Bottom line, my bet is that when your ground went it took out the climate control seat module and connector and that the dealer will have to program the module once you or they install it. I would guess that if you pull the connector at the module you will see damage. I think it's very unlikely that your TEDs are bad since you say they were working before this incident. I think it was amazing that that the ground lasted as long as it did. Should have failed long ago. I do not think anything you did with the radio affected the seats. The melted ground for the seats is literally the smoking gun.