Hi everyone.

On my previous cars, my rear window demister button once pressed (turned on) would automatically turn itself off again several minutes later. It's varied from 5 to 10 minutes. On my fiancés Clio its about 10minutes.

My RRS doesn't do that and stays on until I manually press the switch. Is this normal? I drive to work which takes about 30minutes and the rear demister can still be on when I arrive.

What model year do you have?

I thought mine turned off after about 15 mins on my MY12, but not sure if that was the case for all models.
Hopefully someone more knowledgeable (not difficult ) will be along soon  ON THE WAY: BMW F21 M140i
MERCEDES GL350 - Metallic Navy Blue w/Grey interior

GOING: BMW F31 335D MSport+ xDrive Touring
GONE: Land Rover Discovery 4 HSE - Stornaway Grey w/Black Interior (wish we'd kept it )
GONE: BMW F10 520D MSport - Carbon Black
GONE:MY12 RRS SDV6 HSE Sumatra/Ivory/Grand Black Privacy glass

I have a MY2010

From a MY10 Owners Manual:

HEATED SCREENS AND MIRRORS
Press button to operate the required screen heater. The screen heater(s) will operate for a
timed period before automatically switching off.
The screen heaters will be automatically switched on if defrost mode is activated or if the external air temperature is low.
Note: The screen heaters only operate when the engine is running.

Doesn't say what that timed period is though  ON THE WAY: BMW F21 M140i
MERCEDES GL350 - Metallic Navy Blue w/Grey interior

GOING: BMW F31 335D MSport+ xDrive Touring
GONE: Land Rover Discovery 4 HSE - Stornaway Grey w/Black Interior (wish we'd kept it )
GONE: BMW F10 520D MSport - Carbon Black
GONE:MY12 RRS SDV6 HSE Sumatra/Ivory/Grand Black Privacy glass