You are watching: Lexus rx300 brake light failure sensor
HOW TO: 2 Minute resolve for FAULTY Brake Light fail Sensor Module.
Didn"t see this posted all over so ns figured I would take the upon myself to do so. Like countless people prior to me, i ran into an concern with the brake lights on mine 99 RX300. Once I moved the brakes, no lights would come on in ~ all.*First point to perform is obviously examine the fuse. It to be fine.*Second, check power in ~ the brake sensor at the brake pedal. These execute go out, yet often times room NOT the issue. The 2 wires associated to the sensor room Green/Black and also Green/White. The Green/Black originates from the battery and also should have actually 12v. As soon as the brake pedal is depressed, strength flows through the switch and also out the the Green/White wire. Over there isn"t lot room down there to fiddle roughly with experimentation those wires, so below is one easier way to test that below: -The BRAKE LIGHT failure SENSOR MODULE is located on the cargo area under the fabric lining. As soon as removed, the is a tan colored crate clipped come the ago side of the sheet metal. Indigenous HERE, we have the right to test if the BRAKE SENSOR in ~ the pedal is bad. As I discussed above, as soon as the pedal is depressed, it sends out 12v through the green/white wire. This wire leads ago to the BRAKE LIGHT failure SENSOR MODULE in the cargo area. For this reason here, take her voltmeter and test the GREEN/WHITE cable on the module harness while the crucial IS ON and also the BRAKE PEDAL IS DEPRESSED. If your BRAKE SENSOR is working, you will acquire 12v. If you acquire no power, your brake sensor is bad.*NOW...if girlfriend DO acquire power at the GREEN/WHITE wire, yet you do NOT have brake lamp still, friend will currently test pin #1 on the exact same harness. This is the GREEN/YELLOW wire. Chances ARE, you will NOT gain 12v at this wire. Again, test through the vital ON and BRAKE PEDAL DEPRESSED. If you carry out NOT get 12v at the GREEN/YELLOW wire, then her BRAKE LIGHT failure SENSOR MODULE is bad. This seems to it is in the most typical issue when the brake lights don"t work every one of a sudden.*****A brand-new MODULE will certainly RUN friend UPWARDS that $300 indigenous THE DEALER!!!!******We don"t desire to pay this ridiculous amount that money for a tiny plastic box. And with a couple minutes, you deserve to fix the sensor YOURSELF and also be back to functioning in no time.These sensors are just like the main relays on Honda"s...one pen in general ends up getting a broken solder joint. This is led to by countless heat cycles on/off. The solder heats up when power goes with (BRAKES APPLIED) and also cools once there"s no power (BRAKES RELEASED). Through the Honda relays, that is typically the starter solder joint the ends up cracking. Anyway, back to our modules. With the constant heat cycles and the robotic welds on the plank itself, the design is at risk to failure from the factory...AS us KNOW.*Once your module is out, take it the blue cover turn off of the back, friend will watch the circuit board. Girlfriend will view the pins for the connector follow me the top. Pen #1 is the one that we are working through here. The is wherein the GREEN/YELLOW wire will be when the plug is connected. If you examine it out, opportunities are you will view that the solder has actually cracked and also broken away from the pin. You will see all of the other solder joints space solid yet the solder on pin #1 looks favor THIS:
As you have the right to see, there is a clear difference in the way the solder flows. The photos don"t carry out justice to what you check out in person, yet it is definitely noticeable in my pictures.*You deserve to two one of two points here. An initial would it is in to use solder braid and also remove every one of the old solder, climate resolder the pin afterward. OR use a tad bit more solder come the currently existing solder. The existing solder has end up being a cold solder joint due to cracking, together you have the right to see. Reheat the old solder and also flow brand-new solder top top the pin. After ~ you room done, you will get something similar to THIS:
After you flow brand-new solder, you have the right to clean up the bordering area with your solder braid and also alcohol. Put the blue cover ago on the module box and plug it in. Step on the brakes and also ENJOY the truth that girlfriend didn"t need to spend $300.My vehicle is a 99, it took 14 years for the solder share to fail choose it did. Resoldering this through a great solder joint must last the rest of the life of the car. I"ve repaired many Honda key relays favor this and even year later, there hasn"t been an concern again. My brakes are working perfect in the RX now.
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Time will ultimately tell just how long this deal with lasts, yet just remember that the natural style of the module is vulnerable to failure to begin with...so also if you to be to buy a brand new module, it will certainly fail again at some point. Perhaps not before your automobile dies, however you get the point.Hope this can help someone out!