Toyota 4Runner keyless entry malfunction despite new remote batteries and reprogramming attempts on Toyota 4Runner

Some Toyota 4Runner owners report experiencing keyless entry malfunctions even after replacing remote batteries and attempting reprogramming. These issues may stem from a low or dead vehicle battery, which can adversely affect the keyless entry system. Additionally, some owners find that the key fob requires reprogramming following a battery change due to synchronization issues. A dead battery is often the most common reason for key fob failure, making it essential to verify its condition. Water damage is another potential factor that can impair the functionality of the key fob, so inspecting for any signs of moisture damage is advisable. If these DIY solutions do not resolve the problem, some owners may need to seek assistance from a Toyota service center, although this option can be costly.