Electrics, ECU, Warnings & Lights
Replies and fixes
Remove the battery negative terminal and leave it off for 30min. Do not leave the key in the car!
Refit battery terminal and lock / unlock car.
Start car and raise &lower all electric windows, hold the switch at the top and bottom for 5seconds to reset any auto system.
If this reset fails your car will need to be checked on a diagnostic scanner by a competent person who can read the codes and diagnose the fault.
Most garages have this type of tool or a mobile person who can be called in.