Mitsubishi Repair & Maintenance Questions? Ask a Mechanic Online
That is the only way to do it, other than using the FOB which should also work.
If neither work you have an alarm issue and you can try turning the key to ON position before connecting the battery. This will correct the issue sometimes.
no, changing the battery in the FOB wouldn't cause the issue. Assuming the FOB still works for the locks it's still programmed to the ETACS.