Honorary Yorkshireman just in Derbyshire
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Re: Electronic Parking Brake question
As an EPB user (SWMBO owns it) It could be many things.
Even with the car off, if the ABS sensors detect movement, the EPB will tighten to prevent the car rolling away unattended. This design is because when the brakes cool after use the grip lessens.
Also, if your brake cables are tight (siezing / rusted) the EPB applies brake to a tension, then the stuck cables move a bit more, releasing the tension, for which the EPB compensates. This could be for instance, when you open the boot or sit in, both actions cause the suspension to move, which in turn flexes the cables. Either way, IMHO this is an early indication that attention is reqiured. You dont say how many miles the car has done. My guess is that the rear pads need replacing, the caliper needs servicing & the cables need lubrication. IIRC one cannot get Grand Scenic cables without buying the whole EPB ( more expensive than a Visa Bill). So getting it done now will save a packet.
The service check PB nag does show up when pads are low / not gripping fully.
If you are a DIY'er, there are posts on here on how do do this without grief? You will need a piston pusher (about £10 from Halfords) & know which make of calipers are fitted before buying new pads (less than £20).
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Currently in Nottnoc's garage:
2008 Scenic Mk2 Dynamique 1.6 K4M 782. 1998 BMW K1100LTSE, 1994 MotoGuzzi Caifornia 3 LAPD, 1972 Norton Commando, 2010 Trafic SL29 M9R782 115, Lots of tools, Camping Gear & Booze