I would check the ground wire. Could just have a bad connection.

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Hi fellow Scenic ll owners,
I've owned my 2008 Scenic ll for 9 years now,it's a 1.6 auto and I hardly do anything to it apart from the usual maintenance.
Had the gearbox fault flash up 18 months ago and changed the solenoid in the gearbox(£30.00 from eBay )myself and has been good as gold since.
Went for its M.O.T. last week and the only advisory was one of the rear shock absorbers had a slight misting of oil so will get that sorted.
Keep thinking about having a change but it never gives me any real problems or costs me too much so I'll keep it.
Enjoy the Scenic ll.

check out the plug of the parking brake (at the spare wheel well) more exactly, often here is a cable break or oxidation.

Also have the parking brake switch like a quirk or the central connector under the driver's seat (Under the carpet) is wet

I was having my rear pads and discs changed on my 07 Scenic, when the mechanic noticed il need a new caliper on the passenger side. We ordered the new caliper on the Friday and it got there on Monday. The mechanic kept the electronic parking brake disconnected by disconnecting the battery over the weekend, until the part arrived. Monday came, he fitted all parts but then come into the problem of being unable to reconnect the electronic parking brake. He plugged it to to a diagnostic computer and was presented with a code and was unable to clear the codes and reconnect the hand brake. So I took my car to a separate garage and they too was baffled when they were presented with the same problem of being unable to clear the fault code that was appearing.

Have anyone had the same problem after changing their pads etc ? Any feedback will much appreciated