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The brake lights do not turn on when I apply the brake on a 1991 4 runner light bulb or sensors?

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βˆ™ 2006-12-25 02:52:08

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yes bulbs,yes fuse, yes brakes switch... everyone should have a shop manual for their vehicle, and the library should have a professional shop manual(wiring diagrams and more detailed info) available in the reference section for FREE....make copies of the right sections, and fix it like a PRO!! good luck Dave :) You probably have a brake light safety switch out in your car, it is located directly behind your brake pedal. it simply un screws and disconnects. so what u can do is take it out go get checked at ur local car parts store and if it is bad replace it. most likely that that could be it. There are a few other possibilities: 1)the fuse is either burned out or not inserted properly or, 2) there is no electrical current getting to the switch or lights [an "open" circuit] or, 3) the brake light switch, mounted on or near the steering column and/or the brake pedal ARM, may ONLY be out of adjustment or, 4) the switch is defective. To begin, install a new fuse, regardless of whether the old fuse looks good, or not. Then, check out the switch BEFORE you buy a replacement, or check anything else. First, let us discuss how the brake switch is adjusted, and then how it works. The brake switch is adjusted, after loosening the locking nut, by "screwing" it in or out, into or out of it's mounting bracket. The switch works like the light switch in a refrigerator, in that it is OFF [contacts open] when the brake pedal is fully released, and when the pedal is depressed, a spring inside the switch pushes the switch plunger to an extended, switch ON [contacts closed] position. IF the switch is screwed too far in, then when the brake pedal is depressed, the plunger cannot extend far enough and the switch does not turn on. To test the switch, simply remove the wiring harness at the switch, loosen the locking nut, and unscrew [back out] the switch a few turns so that the plunger can fully extend. Properly reconnect the wiring harness. While a helper watches the brake lights, you cycle the switch plunger from fully in to fully out several times. IF the brake lights do turn on and off, the switch is OK and only needs to be screwed back in until the lights go out, plus another one half turn in. Then tighten the locing nut, and the job is finished. On the other hand, if the switch test does not turn the lights on, there could be two remaining causes: 1) there is an "open" circuit or, 2) the switch is defective and must be replaced. First check for electrical current at the fuse block, and at the switch connector. If there is power there, then to save time install, and properly adjust, a new brake light switch. If that does not solve the problem, you will have to seek out and repair an open circuit fault somewhere between the switch and the brake lights themselves. Good luck. j3h.

2006-12-25 02:52:08
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Q: The brake lights do not turn on when I apply the brake on a 1991 4 runner light bulb or sensors?
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