Originally Posted by dejafa
I am having this same issue too! I thought my old battery was dying so I purchased new batteries, replaced them and the majority of the time they don't work (like 1 out of 50 it works). So recently I've just been locking/unlocking with just the key and not the remote. If anyone has any helpful inputs please let us know! THANKS!
Have you tried the inside button and all
the locks lock and unlock? Try it repeatedly at least 5 or 6 times. Do the slow down in locking and unlocking? If they do, do a search on this Lexus site (not just RX300) for lock malfunction and aftermarket replacement. A ton of information on what to do there. As one other poster said, clean the contacts. I am not suggesting this to anyone who is not knowledgeable in electronics or meticulous about what they do but I disassembled my DIL's remote and thoroughly cleaned everything. Doesn't seem like you and the other poster on this thread could have the same problem but with so many
of the batteries made in China now (most good I'm sure), I am more suspect about the standard of quality than when they are made here. I have had bad Chinese made batteries of several different types (and I don't usually go for cheap batteries)