Usually, disconnecting the battery cable is what resets your car's computer(s) ... typically reverting to "default" settings and (sometimes) clearing any trouble codes.
Generally, there's no need to do anything after you've reconnected the battery. Some cars have "learning" modes that adjust various settings based on your driving style, and it might take some time for the computer to re-learn everything. But there shouldn't be a big difference.
A few cars have language display settings (German/English, for example) that "toggle" from one to the other each time the battery is disconnected. The owner's manual should explain how this works.
May be a loose or corroded battery cable or broken ground cable
try taking the battery cable loose for about three minutes. that should reset it.
Check for a loose or corroded ground or battery cable Check for a loose or corroded ground or battery cable
That a cable with a primary function to the computer working properly is loose, thus impairing the computer's ability to work properly.
Try taking the negative battery cable loose from the battery for about 3o seconds and then put it back on and tighten it good. This should reset it.
A battery in poor condition, Dirty battery cable connections, Loose battery cable connections, A worn out starter,
Cause a no start situation.
Yes, if the negetive battery cable is not connected propperly to the battery, it will ruin the alternator and probably kill your car.
Yes
To troubleshoot a loose cable connection in your computer system, first power off the computer and unplug it. Then, check the cable connections to ensure they are securely plugged in. If a cable is loose, gently push it back into place. Test the connection by powering on the computer and checking if the issue is resolved. If the problem persists, try using a different cable or port to see if that resolves the issue.
Defective, corroded, or loose battery cable.
Look for a loose or corroded positive battery cable at the battery post - or a loose/corroded battery terminal on the positive cable.