Fuse for heated rear window on V Class.

Hi folks,
Does anyone know where the fuse or circuit breaker for the heater element of the rear window on a V class is located and what fuse number it is. I can't
find a reference to it in the handbook.
The switch is not a simple off/on does anyone know how it works or where any other associated relays or control circuitry is located. Can anyone recommend a workshop manual for these vehicles
Many thanks

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