Search | Car Forums | Gallery | Articles | Helper | AF 350Z | IgorSushko.com | Corporate |
| Latest | 0 Rplys |
|
Engineering/Technical Ask technical questions about cars. Do you know how a car engine works? |
Show Printable Version | Email this Page | Subscribe to this Thread |
|
Thread Tools |
12-30-2015, 02:27 PM | #1 | |
AF Newbie
Join Date: Feb 2013
Location: new york
Posts: 9
Thanks: 1
Thanked 0 Times in 0 Posts
|
Short in horn circuit?
Friend has a 2010 Murrano. About 6 months ago, had front end of car replaced, such as grill, radiator. Couple months later, horn fuse starts blowing.
Today, we looked at the horns. I am thinking they were miswired, because one horn has black wire attached to ground, and the other horn has green wire attached to ground. I reversed so that both horns have black wires on ground connection. Fuses are no longer blowing and all seems good. First of all, am I correct that they were miswired, or is it normal to have the two horns wired opposite polarity of each other (one horn had green on top, black on bottom, other horn black on top, green on bottom)? Also, I had both horns completely disconnected from the circuit, but still mounted in the car, and there is continuity between both connection terminals on both horns, and thus all terminals were also connected to ground. Is that normal? I've attached pics of the horns BEFORE I rewired it. The left horn was the one I swapped and put the black connector on the bottom, which is connected to the ground. |
|
12-31-2015, 10:32 AM | #2 | |
SHO No Mo
Join Date: Jun 2004
Location: Cedar Rapids, Iowa
Posts: 10,946
Thanks: 99
Thanked 350 Times in 344 Posts
|
Re: Short in horn circuit?
Your pictures didn't show up. To insert pictures on this forum you need to upload the photos to a sharing site, then link to the photo location in your post.
Without looking at a wiring diagram, you're probably correct that the horn wiring should match between the two horns, and likely the black should be connected to ground for both horns. Keep in mind though also that often the horn fuse is the same as the accessory outlets (aka "cigarette lighter") so a fuse that's blowing could also be due to something plugged in to those. The horns have a voicecoil, similar to a speaker, and therefore you will have a low resistance reading through a working horn. It will be low resistance, but not a dead short. That is likely why you are questioning if all terminals are effectively shorted to ground. If you set your meter to measure resistance instead of continuity you will likely see a few ohms of resistance through the horns. -Rod |
|
The Following User Says Thank You to shorod For This Useful Post: |
axxel (12-31-2015)
|
12-31-2015, 11:00 AM | #3 | ||
AF Newbie
Thread starter
Join Date: Feb 2013
Location: new york
Posts: 9
Thanks: 1
Thanked 0 Times in 0 Posts
|
Re: Short in horn circuit?
Quote:
|
||
12-31-2015, 11:04 AM | #4 | ||
AF Newbie
Thread starter
Join Date: Feb 2013
Location: new york
Posts: 9
Thanks: 1
Thanked 0 Times in 0 Posts
|
Re: Short in horn circuit?
Quote:
|
||
12-31-2015, 03:30 PM | #5 | ||
SHO No Mo
Join Date: Jun 2004
Location: Cedar Rapids, Iowa
Posts: 10,946
Thanks: 99
Thanked 350 Times in 344 Posts
|
Re: Short in horn circuit?
Quote:
-Rod |
||
12-31-2015, 04:50 PM | #6 | ||
AF Newbie
Thread starter
Join Date: Feb 2013
Location: new york
Posts: 9
Thanks: 1
Thanked 0 Times in 0 Posts
|
Re: Short in horn circuit?
Quote:
https://carmanuals2.com/get/nissan-m...tion-hrn-48865 hER |
||
01-01-2016, 10:46 AM | #7 | |
SHO No Mo
Join Date: Jun 2004
Location: Cedar Rapids, Iowa
Posts: 10,946
Thanks: 99
Thanked 350 Times in 344 Posts
|
Re: Short in horn circuit?
Per the wiring diagram, terminal 1 should be the green wire connector which is the terminal that would have battery power to it when the horn relay is closed. Also per the diagram, the horn button should activate the horn anytime the horn button is pressed, not just when the key is on.
If the Murano has a panic alarm feature, then the IPDM also can control the horn, which might explain why the fuse would blow maybe when the alarm is disarmed. I still don't see why the fuse blowing would seem to be associated with the key being turned on, or why it didn't start causing issues right away with the miswire, unless there is some aftermarket security system installed that is not configured correctly now. At a minimum though, connecting the green wire to the non-ground terminal on the horn is the way it should be connected per the diagram. Does the horn work properly now? -Rod |
|
01-01-2016, 11:36 AM | #8 | ||
AF Newbie
Thread starter
Join Date: Feb 2013
Location: new york
Posts: 9
Thanks: 1
Thanked 0 Times in 0 Posts
|
Re: Short in horn circuit?
Quote:
|
||
|
POST REPLY TO THIS THREAD |
Thread Tools | |
|
|