Yes I know it should only take 30 mins, but after trying that twice & even having the latest codes downloaded via the dealership, & they also did a reset etc & supposedly couldn't find anything wrong & couldn't even suggest what to do except start by replacing the horn (& at a high price without knowing if it would fix the problem) my mechanic told me to try disconnecting for at least 2 days. He had experienced this problem with some other European cars & it worked, so after spending a lot of money & not being able to lock car even manually ( hatch doesn't lock when you use the key) I thought we had nothing to lose. Ps we had tried re-sinking the keys twice & also replaced a part in the passenger door as well all to no avail. Also we had to disconnect the battery as the alarm was going off & the car wasn't even locked. We experienced so many different locking combination problems that we couldn't ascertain the problem. I know this shouldn't have worked but as it did & doesn't cost anything I thought I would share our fix. Computers can be tricky.: