After you change the batteries in key remote for a Mercedes ML 320 do have reset it to work?

In most cases, replacing the batteries in a key remote for a Mercedes ML 320 does not require resetting. Here's what you can do to ensure the key remote works properly after battery replacement:

1. Make sure the new batteries are installed correctly. Refer to the owner's manual or online resources for the correct battery orientation specific to your Mercedes ML 320 key remote.

2. Try locking and unlocking the car using the key remote. If it works without any issues, no further resetting is necessary.

3. If the key remote is not functioning, try reprogramming it. The reprogramming process may vary depending on the model year of your Mercedes ML 320. Consult the owner's manual or a reliable online source for the specific steps for your vehicle.

In most instances, replacing the key remote batteries and reprogramming it should restore its functionality. However, if you continue experiencing issues, it's best to consult with an authorized Mercedes-Benz dealership or a qualified automotive locksmith who can diagnose the problem accurately and provide the appropriate solution.