Reasons Why Your Lexus RX300 Side Marker Lights Fail
Your Lexus RX300 side marker lights protect you by increasing your vehicle's visibility. However, just like any other light in your vehicle, they will eventually get worn out and need replacement. To avoid getting pulled over, repair or replace your side marker lights once they become much dimmer or stopped working completely. Here are some of the common problems with your Lexus RX300 side marker lights:
Burned-out bulbs are among the most familiar causes of side marker light failure. If one of your side marker lights stops working, pry off the lens of the faulty light and check the bulb. If the bulb is too worn out or has a broken filament, then it will have to be replaced.
Loose or corroded bulb sockets, wires, or terminals
If your side marker lights are working intermittently, then you might have loose wiring connections or corroded components. Examine all the wires and electric terminals that are connected to your side marker lights and tighten or secure them as needed. Check for any signs of corrosion on your bulb sockets, wires, and electric terminals as well. Clean these parts of your side marker light assembly and make sure that they are free of rust and other debris.
A telltale sign that your RX300 has a blown fuse is the simultaneous failure of more than one of your side marker lights, tail lights, and other auxiliary lights. Refer to your vehicle's service manual for your faulty side marker lights' corresponding fuse and see if it is damaged. When replacing the blown fuse, make sure to get one with the same amperage; you can also use your service manual to find out which type of fuse to get.
Other troubleshooting tips
You can also check for low voltage or poor ground at the electrical connectors and the bulb sockets to see if the right amount of voltage is being supplied to your side marker lights to keep them working flawlessly. A faulty light switch can also be the culprit behind inoperative side marker lights, so make sure to check for a bad switch as well.