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For the rear heated seats, the LIN circuit for the two heating modules, the two switches, and the AUC sensor are all tied together and terminate at pin 1B-9 of the junction box.
Front seat heating modules are also connected to the LIN bus. However there's also a Driver's Seat Module that also appears to control the driver's seat heating and does not connect to the LIN bus. I doubt they both exist in any given car, but it might explain why driver's is not failing. As the front switches are integrated into the HVAC controls, there's not a direct LIN bus connection.
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1986 Delphin 528e - Roof rack equipped lumber hauler.
2008 Platinum-Beige X3 3.0si - Current project
2012 Alpine White X3 xDrive35i - My new snowmobile.
2020 Estoril Blue 440i xDrive cabrio w/MPPSK - This car is a blast to drive.
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