Hi, Alistair. I think your brake lights are what are staying on. On the brake pedal there is a switch that controls the brake lights. This switch is likely what has failed. I couldn’t find a YouTube video for you showing how to replace it. I am including a link to another video, however. I’m not sure, but I believe the process for this Caravan should be very similar if not the same as your Voyager. Fast forward to 4:40 where he shows the switch. Hope this helps, good luck!
https://www.youtube.com/watch?v=riwLl48m07o