Just recently purchased a 94 Lexus LS400 from a neighbor for $300 bucks and have been fixing it up, I recently took on the the task of fixing the electric antenna which didn’t work. First I took the trunk panel off and found that someone had tried to repair the antenna issue by installing an aftermarket antenna assembly which was poorly installed. I was able to purchase a used antenna motor assembly from the local wrecking yard but for a different year. I was able to make it work but drilling new mounting holes about an inch up from the original mounting holes and it mounted up nice. If anyone out there needs help with these antennas feel free to contact me.
-Mitch