I’m thinking of fitting a remote start to my car…, but the system I have requires several main connections to the ignition.

Accessory:Allows you to power accessories like the radio without starting the engine.
On: Powers the vehicle's electrical systems without starting the engine. Dashboard lights and other electrical systems are active in this position.
Start: The starter motor engages, and the engine begins to run.

Is there anywhere I can splice easily into these as the cars start button only appears to have acc and start..?

Thanks

Why do you want it ?

Have you considered the insurance implications ?

Power without the engine running shuts down for a reason - it flattens the battery fairly quickly on an L405.

If you want to pre-warm the engine, search for threads containing FBH.