2007 Hyundai Sonata Owner's Manual - Page 24

1FEATURES OF YOUR HYUNDAI 10 B070E01NF-GAT Replacing the battery When the transmitter's battery begins to get weak, it may take several pushes on the button to lock or unlock the doors, and the LED will not light. Replace the battery as soon as possible. Battery type : CR2032 Replacement instructions: Battery HNF2005 2. Remove the old battery from the case and note the polarity. Make sure the polarity of the new battery is the same(+side facing up), then insert it in the transmitter. B070E01NF 1. Carefully separate the case with a coin as shown in the illustration.