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It could be the resistor but its just as likely the EMTC. Start with trying a reset on the EMTC.
With the ignition off, perform a "reset" of the Electronic Manual Temperature Control (EMTC) module by removing fuse 15 (10 amp) off the Smart Junction Box (SJB) for 10 minutes. Then reinstall the fuse and recheck operation.
If that doesnt change anything then its a crap shoot without proper tools to test.