Stock there are only two setting. The HKS TEMS controller uses a different controller ECU and has a three button panel. Many MKIII's didn't have the option and just had a coin try or had the controls for the heated seats there(not a USDM option). The diagnostic information in the TSRM (link in the FAQ section) explains how they should operate.... such as three bars at WOT and braking when on the sport setting.
TEMS wasn't necessarily rare, per se... but it was more common in the US market than elsewhere. The European manual (which covers LHD and RHD models and German models which had a number of differences) doesn't even talk about it.
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