Only just observed a small flashing red light on the passenger side when the car is parked and locked.
Does this light simply indicate the alarm is set?
Or, does it indicate a problem?
Can it be turned off?
Ash is right, its to indicate that the alarm is active.
As its a European designed car to be driven on the left, the light is actually on the drivers door.
Seat obviously decided not to make 2 different door cards sets.