Seat heater switches-drivers work, passengers doesn't.
#3
#6
Are you saying that when the driver's seat heater switch is pressed, the passenger seat heater switch lights up as well as getting hot? If so, it would seem that the previous owner may have been aware of the passenger seat module issues, and wired both seat heater switches to the driver's switch. Now that the module has been repaired, you can find where the switches were wired together and separate them.