Question about Jeep Grand Cherokee

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When i turn the igniton key to on the fuse for the heater/ac first the turn signal stoped working when the heater /ac fuse blew. I replaced the fuse. the turn signal and heater worked for 2 days then the fuse blew. I removed the fuse for the heater/ac and the turn signal worked for a day. now the turn signal does not work and when I turn the ignition on the fuse blows immedietely. I downloaded a fuse box diagram from and it states that fuse # 20 10amp controls ignition run/ heater/ac,/left and right turn signal sense and heated seats. I do not have heated seats. what is ignition run and left and right turn signal sense? could one of these circuits be the one that is blowing the fuse? I disconected the ac compressor and the fuse blows. the fuse blows when the heater/ac controls are off. I hope you can help ne with this problem

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The ignition run is to the ECU or Engine Control Unit. And the blinker sense is for the blinkers to chime when left on for more than one minute. Finding these kinds of problems are very hard. Because from what you said earlier that it ran for 2 days. So it has to be a wire that is shorting out somewhere on one of these components. It should be under the dash somewhere. Behind the instrument panel on the drivers side. The best option that I can give you is just reach up in there and move all of the wiring around. But just do it in one small area and check the fuse continuity to ground. I will explain how to do that if needed. Just comment back and ask if you don't know what I mean. Or need to know how do to it. If you check to ground now it will show that it is grounded out. That is why it is blowing the fuse. By moving the wires in small sections then checking. When you find where it is not grounding out, then you can look closely in that area for a wire that is grounding out. I hope that this helps. These are sometimes very hard to find. Good Luck!

Posted on Oct 24, 2010


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