Took cover off of my roadster after the winter today, battery had been on ctec maintenance charge.

Car started 1st time but heater fan wasn’t working. Turned engine off. Checked every single fuse and all good. Restarted engine and soon after spoiler came up, light on spoiler switch was flashing but couldn’t lower spoiler. Turned engine off and put code reader on. No codes. Restarted, heater blower came on full blast and stayed on full despite turning the dial to lower fan speed and fan wouldn’t turn off neither. Then had a number of warning lights come up including ABS. Used code reader again and no codes. Restarted a few times and warning lights disappeared and I was able to lower spoiler. Switched off engine, removed key and found that heater blower continued to run. Only managed to stop it by disconnecting battery.

Has anyone ever had a similar experience or have any ideas to help me??