One of my co-workers also mentioned that it could be the common power source for the heater circuit (the PCM just controls the ground path). This would put the cause somewhere in the harness, but I don't know where that would be in a Contour harness.
1999 Contour SE Sport MTX75 T-Red/Grey
Audio: Pioneer DEH-7400MP (MP3 CD), Pioneer TS-A6857 front & rear, PPI PCX-250, Infinity Perfect 10.1
Other: cup holders, cargo net, Blizzaks, Potenza RE950s
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