It should come on itself without it, or on the timed climate when programmed on the screen menus.

There are loads of threads about issues and what things it needs to be happy with before it comes on, like water temp, voltage, fuel level, outside temp etc.

I have the remote for mine. If you don’t have one I’m not sure if you need a receiver aerial or something too, others more knowledgeable than me will be along soon.... 2011 Range Rover Vogue SE 4.4 TDV8

Previous cars :
2003 Range Rover Vogue TD6
1999 Discovery Td5 ES
1995 BMW M5 3.8 6 speed
1992 Range Rover 3.9 Efi Vogue
1992 BMW M5 3.8
1988 BMW 735i SE
1989 Ford Sierra XR4x4 2.9i
1981 Ford Fiesta Supersport

Thanks again

Set mine on timer and works faultlessly, runs for 30mins max. I find 15 mins running is ample to totally defrost my windows and interior is toasty, get in,put heated seat on and heated wheel on and very soon a nice place to be on these recent mornings. You need good battery voltage(I fitted a 2nd batt under boot floor) and a reasonable amount of remaining fuel in ya tank. Never bothered with a remote fob, just use the timer. 2008 L322 Vogue 3.6 TDV8 in Java Black with parchment and Navy interior. 125000mls.

I used to be indecisive and have a split personality... but we are ok now...I think?