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It's a little hard to say, but I'd start with the thermostat as suggested. It all depends if they are wired series or parallel, either on the signal or power. The power to the unit itself is probably series, so if the one behind the couch is first, you'll need to re-make the connection to get the other to work. I would suggest you consult an electrician - there are many ways they could be wired.
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1999 e46 328i Ti Silver / Black[retired]
2007 e90 335xi Jet Black / Black[retired]
2011 e70 X5 35d Vermillion Red / Cinnamon
2011 e92 M3 LeMans / Fox Red extended |