Blown e.f.i. fuse - 1991 Toyota Pickup

Should be one... under steering column.

If you suspect a blown fuse, i suggest that:

Instead of wasting time searching for the exact location, why not just remove each fuse 1 by 1, and replacing them as you go so you don't mix them up. If you have any blown fuses, you will find it in under 30 seconds. If you don't know the difference between a good vs blown fuse, ill post a picture to help you identify.



If your car has the round clear fuses with metal caps on each end, then blown ones will be burned black.

Find your fuse block, remove fuses 1 by 1 , replacing each that you find is ok with the original. (no need to replace a fuse that is still good) untill you find the blown fuse. Replace the blown fuse with a new one. A blown fuse looks like this:


ALL BLOWN FUSES WILL HAVE A BREAK IN THE MIDDLE SIMILAR TO WHAT IS SHOWN ABOVE. needle nose pliers works very well. This procedure will not take no more than a couple minutes.

I believe it deserves mention here that about 98% of all brake light malfunctions do not have anything to do with a blown fuse. In fact, fuses are NOT the CAUSE of electrical circuit malfunctions at all. Electrical circuit malfunctions cause fuses to blow. It is very important when diagnosing electrical circuits, that you understand this basic "cause and effect", so you do not waste time and effort looking for the wrong source of the problem. If there is a blown fuse involved in your brake light problem, you need to find out WHY. Simply replacing a blown fuse will not fix the problem that caused the fuse to blow and will only result in another blown fuse.

With that said, the fuse that protects your brake lamp circuits is Fuse 6B (20 Amp) in the instrument panel fuse block.

HINT: This fuse also protects your hazzard flasher circuits. If these work (front or rear or both) the fuse is not blown.

Fuses There are a number of fuse blocks on these vehicles. The multi-purpose fuse block is located inside the passenger compartment of the vehicle, under the instrument panel, towards the left of the steering column. The dedicated fuses are located in the engine compartment at the left rear corner (if equipped with A/C) and also in front of the right strut tower. Blade type fuses are used. A blade type fuse has test taps provided to allow checking of the fuse itself, without removing it from the fuse block. A test light can be used. The fuse is okay if the test light comes ON when its one test lead is connected to the test taps (one at a time) and the other lead is grounded. Change the position of the ignition switch so the fuse circuit being tested has voltage applied to it. Fig. 1: A test light can be used to test the fuse
When a fuse is blown, there are two probable causes as follows: One is that the fuse was blown due to a flow of current exceeding its rating. The other is that it is blown due to a repeated ON/OFF current flowing through it. Which of the two causes is responsible can be easily determined by a visual check as described below:

1. Fuse blown due to current exceeding rating: As seen in the illustration, a fuse that is blown due to an exceeding current has a section missing. If the blown fuse looks like this, do not replace the fuse with a new one hastily since a current heavy enough to blow the fuse had flowed through it. First, check the circuit for shorting and check for abnormal electrical parts. Only after the correction of such a shorting condition, the fuse is to be replaced with one of the same capacity. Never use a fuse of a larger capacity than the one blown. If such a fuse is used, electrical components or wiring can be damaged before the fuse blows in the event that an overcurrent occurs again. Fig. 2: View of a fuse blown due to overcurrent
   Fig. 3: State of a fuse blown due to thermal fatigue
   
   
2. Fuse blown due to repeated current ON/OFF flow: The figure shows a fuse blown due to repeated current ON/OFF. Normally, this type of problem occurs after fairly long period of use and hence is less frequent than the above type. In this case, you may simply replace the fuse with a new fuse of the same capacity. Fig. 4: The lid on the fuse block in the engine compartment has the identification information
   Fig. 5: Remove the fuse panel lid by unfastening the clips and pulling it up and off the panel
   Fig. 6: Pull the suspect fuse up and out of its receptacle and check the element
   

You can check the fuse panel for a blown fuse. Replace blown fuses with the recommended fuse only. Its not safe for your car or you, to switch them to a different size. Be sure that your ignition is in the off position and take the keys out before you change any fuses. If its not a blown fuse, you could have a blown fan motor or faulty wiring but I'd start with the fuse box.

Under hood box: Fuse 20 (120A)
Hope this helps.

above is a picture of a blown fuse...if the fuse where not blown the at the top of the fuse are two metal progs....if us a multimeter of a fuse tester it will tell you without removing the fuse if it is blown....the fuse testers are at any auto store and usually pretty cheap.....good thing to have...saves lots of time. I would use this method over a diagram in a car because someone could have rerouted power in your case to another fuse...or worse...to no fuse at all. Any way this will help you find any blown fuse and quick

Fuse is probably blown out. Replace fuses for respective functions. Find the fuse box: might be in engine near battery or below steering wheel. open top and check for blown fuses. Try replacing if blown fuses are found. If all fuses are OK then it is very unlikely that all the bulbs are blown.

Check the power ditribution box under the hood for any Max fuse blown. Check and see if any of the small fuses are blown.