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If you switched to LED lights you will most likely also need to install an in-line wire device ("Load equalizer" $15 at O'Reily's).
In my case I am switching to LED after upgrading my lights from 2000 RX to the 2002 style. Which means I needed to replace the wiring harness also. ....and I got the rear light assembly from Pick-A-Part so the bulbs needed to be replaced. After replacing the bulbs (just four brake/tail light bulbs (type 7443) I noticed my brake light indicator light came on - Hmmmm.... I can't get that thing to turn off now. I have not yet switched to LED. I wanted to get it corrected before switching to LED so that when the light comes on after switching I will know that it is because of the LED light and not something else.
I will trying replacing the top mounted third brake light and see if that fixes it; otherwise I might just forget about the fix and just switch to the LED light. But see I DID buy the load equalizer so that the brake indicator light will go out.
But if it's not ON because of the LED then the load equalizer will probably not help.
I'll update later....
All my brake lights were out so I figured it was my turn to do this repair. It's an easy fix.
Biggest hassle (for me anyway) is getting that stupid power outlet out. I must have damaged the claws because now it doesn't want to stay back in. Problem for another day.
I really hate taking off the interior panels because something always breaks. In addition to the power outlet one of the wings holding the module in place broke off when I was removing it. I duck taped it to that foam block to keep it from moving around.
The cracked solder joint
Where the module lives behind the left rear panels
Haynes repair for Lexux RX 300 does not mention this sensor module much less a work around fix
The Haynes repair manual is usually quite limited. You can get the service manual on CD for ~$20: https://www.clublexus.com/forums/rx-...rock-auto.html
That said, even the service manual doesn't tell you how to diagnose and repair a module. The "Body Electrical" manual does tell you where the stop light module is and how to determine if it needs to be replaced. Many thanks to member M45owner for providing a repair procedure for it.