Some automakers have even expanded the remote start button's functionality and/or use a different icon — that's why BMW has a diamond button on its key fob, for instance.

I found this button to de-fog vehicles - but there's a catch Motorists may not be aware that car key fobs have a range of hidden features with two buttons adopting a secret trick.

How to start your car with a dead key fob In a video with over 348,000 views, the TikTok account for McGrath BMW of Elmhurst (@bmwofelmhurst) explains how one can start their car with a dead key ...