Join Date: May 2009
Location: Uxbridge, MA, USA
You need someone either at a dealer, or a mechanic with a scan tool capable of looking at the inputs and outputs of the BCM. My seat heater sometimes will turn on but won't go off. Or won't turn on at all. This affects both seats when it malfunctions. I have traced it to be a software glitch in the BCM (body control module). The reason I suspect this is that the scan tool shows the inputs from both switches working properly, and I can acutate the outputs to turn on the seats via the scantool. Usually happens while driving. If I pull over and shut the key off for a few minutes then turn the ignition back on, all is fine. It hasn't happened in a while, and now the car is sleeping so I can't verify if it still happens. I would like to know how you make out with the repair. Also, the heater elements can be checked with an ohm meter to see if they have continuity. Furthermore, there are many other things to consider before just replacing the heater part. Like bad relays, etc...
2010 Rally Yellow 2SS M6 with Black rally stripes