The module is under the driver's seat, labeled DSM module. My symptoms were that the heated / cooled driver's seat did not work, but the passenger seat worked. I could not hear the blowers running at all on the driver seat. After I reseated all the connectors on this module, the driver seat climate control started working. There is a TSB which may address this issue:
Ford TSB SSM 47814
Some 2016-2019 Explorer, 2016-2018 MKX, 2019 Edge/Nautilus, 2017-2019 Fusion/MKZ,
and 2018-2019 F-150/Mustang/Expedition/Navigator vehicles equipped with climate
controlled seats may exhibit a buzzing noise from the front seats, front seats too warm,
and/or inoperative climate controlled front seats. DTCs B14BA:13, B1154:4B, and/or
B14B9:13 may also be present. This may be due to loose terminal pin fit on the driver seat
module (DSM) connector C341D (16 pin). If a loose terminal pin fit condition is found during
normal diagnostics per Workshop Manual (WSM), Section 501-10, a new service pigtail
connector (part number 3U2Z-14S411-BRAB) is available. Refer to Wiring Diagram, Cell
119 to make sure C341D is a 16 pin connector and not a 20 pin connector. Refer to Wiring
Diagram, Cell 5 for the recommended splicing procedures