Toyota 84340-04020 Switch Assy, Stop Lamp

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The brake light switch is located at the top of the brake pedal assembly and can be accessed by removing the trim panel beneath the steering column. It is responsible for opening and closing the brake light circuit, allowing current to flow to the brake lights when the pedal is pushed. If the brake lights do not work, check the fuse and bulbs. If those work, check that voltage is available at the switch. If there is not, there may be an open circuit between the fuse block and the switch and if there is but the lights do not work, there is an open circuit. When searching for it, check in between the switch and the light. To replace, begin by removing the trim panel below the steering column. Disengage the electrical connector, remove the locknut, then remove the switch. Installation is the reverse of removal, adjusting the switch afterward.

First check and adjust the brake pedal height if necessary. Then, loosen the switch locknut and adjust the switch so that the plunger protrudes within the proper range specifications or lightly contacts the pedal stop. Tighten the locknut and plug in the electrical connector.

After adjusting the brake light switch, plug the electrical connector into the switch and reconnect the battery. Then, make sure the brake lights come on when the brake pedal is depressed and go off when the pedal is released. If they do not function properly, repeat the adjustment procedure until they do.