Renault Scenic / Renault Grand Scenic / Renault Scenic Magan 2005.
After my battery conked, the electric handbreak motor was jammed and not releasing the handbreak, I couldnt use the emergency pull cord in the boot as it had recently been used by a garage.
After trying several things and a lot of swaring, I was given the tip to try this.
Thank god it worked for me and hope it does for you too.
The handbreak fault is still showing on the dash though!