Had this solid instead of flashing light a couple of times, it means the one shot windows and/or the remote windows/mirrors opening/closing is not working. Follow the instructions in the manual for resetting, which means fully opening and closing the windows with a further pull/push at full open/close I think, and hey presto the light then flashes again and the remote can work the windows and mirrors too. Supposed to only need this if the battery has been disconnected, but you know what modern electronics are like these days.