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Old 06-24-2009   #1 (permalink)
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Lightbulb [05 Civic]Dead head unit/back-up fuse.

Hello Honda Civic Forum!

Alrighty, first thing, I had an amp pushing two subs running off of the factory HU and I decided to call it quits because I'm just not enjoying the way it sounds.

Secondly, I removed everything from the vehicle that was put in for the setup. However, now the HU and power locks don't work. I checked all of the wiring from behind the harness and and around the car in general to look for a ground but have come to no conclusion.

The backup fuse #9 in the fuse box which is a 10A was shot and I figured I would simply replace it. Instantly though the new fuse is shot as soon as it's placed in the #9 slot.

I have checked a few wiring diagrams that included the wiring harness and dock locks but have run into no grounds. I'd like to think the HU is simply done and that is what's causing the blown fuse.

Any help would be greatly appreciated.
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Old 06-24-2009   #2 (permalink)
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Re: [05 Civic]Dead head unit/back-up fuse.

Take the headunit loose and see if the fuse still opens, if it still opens take the headunits wiring loose (hoping you used an adaptor)

A bad ground will not blow the fuses you have a short circuit.
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Old 06-24-2009   #3 (permalink)
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Re: [05 Civic]Dead head unit/back-up fuse.

I've had a bad ground blow a fuse before. Then again, maybe I'm thinking the two, short circuit and bad ground, are the same. I'll check it out.

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A bad ground will not blow the fuses you have a short circuit.
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Old 06-25-2009   #4 (permalink)
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Re: [05 Civic]Dead head unit/back-up fuse.

a "short" is when power touches ground and a fuse blows (or a fire if a bigger fuse was used then what was spec'd) due to too much power flowing. a bad ground would be an "open" and that's when power can't flow because the circuit's not complete.
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Old 06-26-2009   #5 (permalink)
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Re: [05 Civic]Dead head unit/back-up fuse.

yea, seems to me like you may have fixed the bad ground but have a short now.
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Old 07-09-2009   #6 (permalink)
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Re: [05 Civic]Dead head unit/back-up fuse.

After playing around with the wiring harness and what not, I was able to get the head unit to power up. However, I was getting no sound to the speakers and after I replaced the headunit in the dash the backup fuse in the hood fuse box blew out again. If it isn't the head unit, where should I look now?
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Old 07-10-2009   #7 (permalink)
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Re: [05 Civic]Dead head unit/back-up fuse.

you've still got a power wire shorted to ground somewhere. something's being pinched when you put the HU in i think.
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Old 07-17-2009   #8 (permalink)
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Re: [05 Civic]Dead head unit/back-up fuse.

Were you able to fix the locks? Im kind of having the same issue as you right now, but instead I put on an aftermarket head unit, didnt work, so i put the stock back in and im not gettin any power to the stereo or the power locks
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