I need to know how to replace a light bulb in the rear.It is a brake light

I would like to know if you have turn signals working in the rear. These are the same bulbs that brake lights use. If you don't have turn signals, then you need to replace the bulbs. If you do, then there is probably a wiring issue, or a circurt breaker problem. Hope this helps?

If this is a newer lexus, then its very clever. It WILL be a blown bulb, but when a bulb is out, the car lights the next nearset bulb to substitute. Have a closer look at the rear lights and check all the bulb filaments by eye.

The bulbs could still be the problem since they are double filament bulbs.If your high brake light work but not the low ones the replace the bulbs.If none in the rear work then you may need a brake light switch(on the brake pedal linkage).If this is not the case the check for power to the brake light side of the bulb and repair the broken brake light wire.

automatic answer would be the rear brake light bulb. So much for being funny. Look at the bulbs the bulb that you will want to replace with have 2 elements inside the bulb. The single element bulb is for your tail lights.

Removing:

• Switch off all electrical consumers, switch off ignition key and remove ignition key.
• Remove rear luggage compartment side panel trim (left or right).

• Remove 3 nuts, arrows, and remove housing.
• Remove bulb holder.

Installing:

• Install bulb holder.
• Insert housing into body opening.
• Tighten nuts.
• Install applicable rear luggage compartment side panel trim.

Rear Light Bulb Holder Removing And Installing:
Removing:

• Disconnect electrical connector.
• Depress retainers, arrows, and remove bulb holder.

Installing:

• Install in reverse order of removal.

And the Center Mounted Brake Lamp.
High mount Brake Light Removing And Installing:
The high mount brake light is installed in the rear shelf.
Removing:

• Switch off all electrical consumers, switch off ignition key and remove ignition key.
• Disconnect electrical connector from high mount brake light.
• Remove rear shelf
• Un-clip high-mount brake light from rear shelf, arrows.
• Install in reverse order of removal.

NOTE: The bulb holder base plate contains soldered- in light emitting diodes (LEDs) that are not replaceable. In the event of LED malfunction, replace complete bulb holder.
Additional

There should be 2 screws holding the lenses on for the hatch light, remove those and cover comes off. The plate lights, access them under the rear bumper, they twist and pull out, then just pull the bulb out the connector. The running board light, under board, which will take the light assembly out, or a small flat head screwdriver, pop the lens off the top of board.

the brake lights and the rear turn signals should be the same bulb check the bulbs to make sure they are not blown does your third brake light work if all brake light are out and the bulbs are good check the brake light switch on the brake pedal

I bump into the same problem wrong brake light bulb
try 3157LL . See if you have this brake bulb number

If this is not the case replace the bulb plug (pig tail).
Call dealership for this part
I see this problem before also.

Let me know if this help....

does the third brake light work when braking ? the bar on the rear window? if not replace brake light switch on brake pedel

Sounds like a broken wire somewhere.
Since the middle brake light works I would suspect it is somewhere in the trunk or close to the back seat.
Buy or make a tester. A 12v light with a clip on one wire that you clip to a good ground on the car the other wire with a sharp point. Turn the turn signals on then poke wire to rear lights until tester lights. When tester lights you know the break is somewhere inbetween the tester and the brake lights.

Hope this helps.

Stan