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Old 05-06-2013, 04:29 PM   #1
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Ye Olde Horn Not Working saga

Yep there's a million posts about fixing Jeep Wrangler horns that aren't working and the clock spring being a possible culprit etc. etc. Being unfamiliar with these Wranglers I'm still a bit confused

First, where's the horn fuse for a '98? :-) I've looked inside the glove box fuse compartment and none of those are labeled "horn." I've also looked at the fuse/relay compartment as described in this thread: http://www.wranglerforum.com/f5/fuse...it-118626.html . I don't see any fuse for the horn. One person said the horn doesn't have fuses, only relays. I don't buy that. (the fuse labeling behind the glove box for our Jeep doesn't match the labeling in the above link. For example, we have fuses 3 and 4 labeled as for the Airbag. And those were missing so I put new ones in.)

Back to the horn fuse: is there a fuse for the horn relay separate from the fuse for the actual horn?

I tried switching out the horn relay with the other two relays that matched it. Still no go on the horn. However, given this schematic of the relay:
Jeep Wrangler TJ Horn Relay | Wiring Diagram Circuit
it seemed pretty clear to me that connecting 30 with 87 (pin 3 with pin 5) I should hear the horn. I tried shorting between these two but...no horn. I put a meter on the horn leads and sure enough, there was no voltage with those pins shorted.

I also tried measuring the voltage across the coil of the relay. It seems to me if the horn button and clock spring (and fuse) are all working, I'll see a voltage across that coil when I press the horn button. I didn't see any voltage then, though.

So I get no voltage to the relay. But when I short across between the normally open terminal of the relay and the common, I still get no horn. So do I have two problems: clock spring/horn-button and....??? fuse??? Where does the common of the relay get its power from?

The only think I know for sure is that the horn itself works; I directly connected it to the battery to confirm this.

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Old 05-06-2013, 09:36 PM   #2
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The horn fuse is fuse # 20 in the PDC (box in front of the battery). That fuse powers both the 30 terminal & the coil terminal, usually 86 of the horn relay. Then when you push the horn button on the steering wheel the other relay coil terminal, usually 85 gets grounded to close the relay. If you get grounding at 85 then the clock spring is good. If that fuse is good (test it or replace it with another one) & there is no power to the relay, the wire under the PDC from the fuse to the relay could be bad. Sometimes they break right at the terminal where they are crimped. For reference it is violet & 2 come from the fuse, one to each relay terminal as noted here.

BTW, the links you used were about the 20 fuses in the fuse block, not the ones in the PDC.

You can see these fuses in the FSM but you have to go through the power distribution chapter to see where each of the fuses connect to, they aren’t really labeled as I recall. If you don’t have a FSM check the link below. Also how to remove the PDC if you need to get to the underside to check the wires is in there,don't recall which chapter.


See online read only FSMs here:
Jeep Knowledge Base
You may have to go to the bottom of the page & pick Jeep Resources & online manuals if it directs you to home page rather than the knowledge base.
Pick your model & year then on the drop down menu pick the chapter you need.
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