Help please buzzing relay - Nissan-Navara.net
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post #1 of 12 (permalink) Old 04-06-19, 06:00 PM Thread Starter
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Help please buzzing relay

Hi, long story.... someone drove into me (minor) in December anyway my np300 went to insurer approved garage and they fixed the small ding on passenger door, however it came back and the keyless entry button didn’t work (on same door) and fault with lock system was constantly on display, anyways Monday (6 months later) they picked it up to rectify there mistake, turns out loose wire and I got it back today, however I get home and it’s making awful buzzing and it’s coming from a relay, any ideas what and why??? Also airbag warning is on. Thanks
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post #2 of 12 (permalink) Old 04-06-19, 11:42 PM
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No idea why, but I’d get straight back in touch with your insurer and insist an auto electrician, not a panel beater, is used to rectify their allegedly “guaranteed” repair. Be sure to mention the airbag system is involved. Hopefully their liability lawyer will prick his/her ears up at that.

Generally I don’t advise doing your own investigations on problems you plan on having someone else fix under guarantee or warranty, it opens (still more) loopholes for them to get out of paying.
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post #3 of 12 (permalink) Old 05-06-19, 06:34 AM Thread Starter
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Originally Posted by JDO View Post
No idea why, but I’d get straight back in touch with your insurer and insist an auto electrician, not a panel beater, is used to rectify their allegedly “guaranteed” repair. Be sure to mention the airbag system is involved. Hopefully their liability lawyer will prick his/her ears up at that.

Generally I don’t advise doing your own investigations on problems you plan on having someone else fix under guarantee or warranty, it opens (still more) loopholes for them to get out of paying.
Thanks for your reply, I’m not planning on trying to fix it they are sending a Technician today to look at it, I was just wondering if anyone knew anything, thanks for your reply

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post #4 of 12 (permalink) Old 05-06-19, 10:33 AM
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Is the relay not labelled on the inside of the lid?

Sounds to me like they’ve shorted a wire somewhere in the door. But it could be a coincidence - odd electrical behaviour is sometimes down to a bad battery and/or poor terminal connections to it.

Might be worth checking your battery voltage and giving the terminals a clean, since they probably disconnected it to do your repair and may have damaged or flattened it.

Disconnecting the battery completely for 10 minutes (give or take) is also a common way to reset any weird ECU issues that may be present in most cars, but I don’t know for this one.
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post #5 of 12 (permalink) Old 05-06-19, 04:55 PM Thread Starter
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Is the relay not labelled on the inside of the lid?

Sounds to me like they’ve shorted a wire somewhere in the door. But it could be a coincidence - odd electrical behaviour is sometimes down to a bad battery and/or poor terminal connections to it.

Might be worth checking your battery voltage and giving the terminals a clean, since they probably disconnected it to do your repair and may have damaged or flattened it.

Disconnecting the battery completely for 10 minutes (give or take) is also a common way to reset any weird ECU issues that may be present in most cars, but I don’t know for this one.
Thanks for your input, the garage are saying the battery is only performing at 50% of its original capacity so sounds like weak battery effecting the relay, thanks

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post #6 of 12 (permalink) Old 11-06-19, 04:00 PM Thread Starter
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Updated to this my battery had given up the ghost causing the issue with the relay, new one fitted and all is fine

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post #7 of 12 (permalink) Old 11-06-19, 04:49 PM
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Glad you are sorted.

Battery condition, and quality of all earthing points should be the first check for most electrical problems.

With any NO/NC mechanical relay the internal coil has to overcome a spring for the relay to operate. The steady-state force exerted by the coil is proportional to the current flowing in it. That current is proportional to battery voltage (or more accurately, the voltage seen across the coil). Usually a relay will just switch or not switch, given the battery voltage - it is unusual (but possible) for the voltage to be at the precise level where the relay works, but then something is switched on so that that load is just enough to drop the voltage to the point where the relay coil is no longer powerful enough, setting up an on/off resonance!

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post #8 of 12 (permalink) Old 11-06-19, 07:36 PM
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That is all true. Saying that a relay with too lower voltage applied will often buzz, guessing a combination of a non-linear spring and a bit of momentum in the mechanism sets up bounce.
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post #9 of 12 (permalink) Old 13-06-19, 03:55 PM Thread Starter
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Glad you are sorted.

Battery condition, and quality of all earthing points should be the first check for most electrical problems.

With any NO/NC mechanical relay the internal coil has to overcome a spring for the relay to operate. The steady-state force exerted by the coil is proportional to the current flowing in it. That current is proportional to battery voltage (or more accurately, the voltage seen across the coil). Usually a relay will just switch or not switch, given the battery voltage - it is unusual (but possible) for the voltage to be at the precise level where the relay works, but then something is switched on so that that load is just enough to drop the voltage to the point where the relay coil is no longer powerful enough, setting up an on/off resonance!
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That is all true. Saying that a relay with too lower voltage applied will often buzz, guessing a combination of a non-linear spring and a bit of momentum in the mechanism sets up bounce.
Thanks for your input, unfortunately I got home late last night and the buzzing was back! So I call Nissan Assist and to my astonishment the RAC showed up in 30 minutes (told 4-5hour) he wasn’t much help though he hadn’t a clue, neither did his computer or technical team he phoned, he resorted to pulling it out, told me to start it up to see if any warning lights came on (none did) then said to take to dealer in morning which I did, also on the way home I kept getting check adblue warning even though I know it’s well topped up, according to the manual check adblue means possible fault with the adblue sensor so maybe that’s the relay for the adblue I don’t know no one know what the relay is for it’s not labelled, not in the manual, not online, no info on what it is anywhere, as Nissan said if the RAC didn’t know what it was they shouldn’t have removed it. Anyway it’s with Nissan now hopefully here some news tomorrow, thanks guys

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post #10 of 12 (permalink) Old 13-06-19, 03:56 PM Thread Starter
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Oh and the engine management light (amber) came on shortly after I left for Nissan

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