It could be as simple as your glove box not closing completely . I had this sisue with a car many years ago one week and a dead battery . It was caused by a wire being pinched under the tow bar reinforcement in side the boot or trunk . Most likely a sticking relay or some where something is staying ...

Just reset the service light on my wifes S40t4
HOLD THE ODOMETER BUTTON DOWN WITH THE IGNITION ON ALL LIGHTS SHOWING .WHEN THE SERVICE LIGHT FLASHES LET GO OF THE ODOMETER BUTTON TURNOFF IGNITION AND TURN BACK ON THE SERVICE LIGHT WILL BE GONE .