The brake light assembly can be access through the cargo compartment. Remove the cover to the brake light assembly. Take hold of the brake light connector, push in and turn at the same time. The brake light will come out. Reverse the process to install the new brake light.
The brakelight sensor is located on the brake switch, which is on top of the brake pedal and held on with a 14mm jam nut.
Follow the link below, labeled "How to replace a Lexus IS300 tail light"
Lexus RX300 brake light bulb lamp replacement procedure: Purchase the correct replacement brake light bulb(s) first, before disassembling the vehicle. See sources and related links below for replacement brake light bulb information. Then consult your owner's manual for the replacement procedure. As simple as it sounds, the owner's manual is the best place to start for brake light bulb lamp replacement instructions and illustrations. You may want to consider replacing both left and right at the same time in order to keep brightness and color equal (optional).
To change the brake light bulbs on a 2003 Lexus RX300, first, open the rear hatch and remove the two screws securing the tail light assembly. Carefully pull the assembly away from the vehicle to access the bulb sockets. Twist the socket counterclockwise to remove it, then pull out the old bulb and replace it with a new one, ensuring it’s securely in place. Reassemble the tail light assembly by reversing the steps and test the new brake lights to ensure they are functioning properly.
Remove the center piece of trim on the inside of the lift gate. it just pulls off. then push up on the two tabs at the bottom of the light to remove it. then replace bulb with the correct bulb. .....
Remove the wiring harness from the high mount brake light. Remove the back cover of the brake light assembly. Take hold of the brake light connector, push in and turn at the same time. Reverse the process to install the new brake light.
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Lexus IS300 3rd brake light is changed from the back seat. Pry the light up and disconnect wiring. Replace bulb and put back together. Easy job
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remove bulb from in side the boot
2000 Lexus RX300 brake light bulb replacement: Purchase the correct replacement brake light bulb(s) first, before disassembling the vehicle. See sources and related links below for replacement brake light bulb information. Then consult your owner's manual for the replacement procedure. As simple as it sounds, the owner's manual is the best place to start for brake light bulb replacement instructions and illustrations. You may want to consider replacing both left and right at the same time in order to keep brightness and color equal (optional).