RX - 1st Gen (1999-2003) Discussion topics related to the 1999 -2003 RX300 models

HOW TO: 2 Minute Fix for FAULTY Brake Light Failure Sensor Module.

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Old 02-04-22, 02:02 AM
  #46  
rdaught
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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....
Old 09-16-22, 09:48 AM
  #47  
maxSteel
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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

Last edited by maxSteel; 09-16-22 at 09:53 AM.
Old 09-16-22, 01:15 PM
  #48  
salimshah
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Yes, time makes the plastic stiff and things break easily.

Glad you were able to repair it.

Salim
Old 11-30-22, 08:59 PM
  #49  
Mikeed123
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Default Thanks, Haynes guide is no help

Haynes repair for Lexux RX 300 does not mention this sensor module much less a work around fix
Old 12-01-22, 04:59 AM
  #50  
maxSteel
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Originally Posted by Mikeed123
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.

Just for fun I looked up the price of the module.
At Lexus MSRP is $491 https://parts.lexus.com/p/Lexus_1999...937312140.html
At RockAuto it's $560! https://www.rockauto.com/en/catalog/...ge+sensor,3992

Last edited by maxSteel; 12-01-22 at 05:31 AM.
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Old 05-23-24, 12:34 PM
  #51  
5ampsloblo
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thank you for the info thanks it fixed it...

thanks it worked

Last edited by salimshah; 05-24-24 at 02:02 PM.
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