The "usual" problem is a burned seat cushion element though I have replaced
the odd backrest element, too. Normally, we would load test the power and
ground to the module and then check the elements for continuity. FWIW, the
two elements are wired in series and need to be tested individually.
One thing to consider is that the passenger heater only works when
seatbelt is connected. The driver side will work with or without
belt. If this is not your ploblem then I would replace element.
Several kits available on-line, Good luck!
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