from page 96 of the OM [leads me to believe they are thermostatically-controlled - or, they could be connected to the same circuit as the defroster - while instinct will tell us to read the text literally, one must take into account that the text is likely a translation of german and as such, can have some clunky sections]
Quote:
>Switching on: Make sure that the key in the
starter switch is turned to position 1.
The exterior rear view mirror heating is
switched on automatically at low ambient
temperatures.
> Switching off: Turn the key in the starter
switch to position 0.
The exterior rear view mirror heating is
switched off.
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