Well, with that combination of what's working vs not, makes me wonder if there's something whacky in the BCM that's not causing/letting it send the heat function canbus signal to the door modules when it should. Especially since it's the same on both sides, and I'm inferring from your post both failed at the same time.
IIRC on mine the mirror heat is coupled to the rear window heat, or some other HVAC logic control. Pretty sure I don't have a separate mirror heat switch. If that's the case and your rear window heat is working IMHO not likely a switch-to-BCM issue.
I'd be tempted to try my olde favorite .... 'negative battery cable-disconnect, all-module reset' just to see if that jars things back to normal.
Hope you get it figured out, keep us posted.
'14 Escape SE 2.0 FWD (25 Sep 13 build); 201A SE Convenience Package; Power Liftgate; Leather Comfort Package; Oxford White on Med Light Stone Leather (SYNC 2 w/8" MFT screen)
I love my hard-working '05 F-150 XLT 5.4 V8 trailer-towing truck, too !
Help us help you - what is your year, engine, drivetrain, trim and SYNC version?
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