Door switches

[ghb]

Hi all,
I want to use the door open switches (rear doors) to turn on some 'puddle lights'.
Does anyone know if they operate by switching +12v or grounding, or do they connect via some kind of data bus system (Canbus?)
Thanks

 

[npuk]

Pretty sure it is by grounding. This guide is about wiring door sills to the door switch. W203 Door Sill Install

 

[ghb]

Thanks for the info.
Graham