I've owned my 2003 LS403 about a year and a half, and I'm thinking I should preemptively replace the battery in the keys. I can see it requires a tiny screwdriver to do this, but the owner's manual has no info about exactly what screwdriver to use. Rather than my buying ones at random to try them, can anyone point me at the correct one? Thanks.

 

It should be the same as a Jeweler's or Hobby Phillips screw driver. Smaller than a #0. Almost what you would use on eyeglasses. I think a #0 Phillips would be too large. I know Harbor Freight sells those small Hobby screwdriver sets for just a couple dollars.

https://www.harborfreight.com/16-pie...-set-4143.html

 

Daiso also has these small screwdrivers in individual or 6 piece hobby sets as well.

 

Thanks, folks. I ordered a set of eyeglass screwdrivers, time will tell.