Electrics How to fix bad fm radio grounding? - Civinfo
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post #1 of 18 (permalink) Old 12th January 2019, 16:34 Thread Starter
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How to fix bad fm radio grounding?

On my 8th cen civic type s, the radio reception seems to be pretty poor Compared to my previous mini.

I've read a ton of posts that say this can be caused most likely by one of three things:

-Window tint (which I don't have)

-interference from the rear demister. (I do get this, though its not too bad. The interference still occurs when the demister is off just to a lesser degree)

-bad grounding of the antenna.


The thing is I can't find any explanation anywhere of how to actually FIX a bad ground.

Does anyone know how to do this or any posts that explain it?

I can still hear the radio, but as I'm driving the static is quite distracting.

Last edited by GoldenOne; 12th January 2019 at 18:10.
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post #2 of 18 (permalink) Old 12th January 2019, 17:39
 
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watching this as at times my radio is shocking!!
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post #3 of 18 (permalink) Old 12th January 2019, 18:36
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Remove the plastic surround on the under side of the tailgate and clean the two connectors you see here. I also removed the amplifier that these two female connectors are connected too just to make sure the bolts arent a ground too. There is supposed to be another ground somewhere, but I couldn't find it, I think it may be under the headlining. Cleaning up those two connectors certainly improved my signal no end.

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post #4 of 18 (permalink) Old 12th January 2019, 18:55 Thread Starter
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Thank you!!
Will give this a go as soon as i'm home
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post #5 of 18 (permalink) Old 12th January 2019, 20:47
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Going to give this a go in the morning also as the reception on mine drops in and out something chronic at times
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post #6 of 18 (permalink) Old 12th January 2019, 21:04
 
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Any suggestions on the best way to clean them?
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post #7 of 18 (permalink) Old 12th January 2019, 21:43
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Quote:
Originally Posted by Das View Post
Remove the plastic surround on the under side of the tailgate and clean the two connectors you see here. I also removed the amplifier that these two female connectors are connected too just to make sure the bolts arent a ground too. There is supposed to be another ground somewhere, but I couldn't find it, I think it may be under the headlining. Cleaning up those two connectors certainly improved my signal no end.

what is the empty terminal should there be something on there rear demister maybe ?
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post #8 of 18 (permalink) Old 12th January 2019, 23:46
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Any suggestions on the best way to clean them?
You can buy a can of electrical contact cleaner which is a solvent and will remove dirt and light oxidation - places like screwfix will probably sell it or electrical wholesalers. Failing that try a google online. If you have bad oxidation or corrosion, then it may be necessary to use something more powerful such as metal cleaning cream or brasso. I would personally avoid sandpaper or wire wool to avoid reducing the thickness and thus the tightness of the plug / contact.

Other tricks on a cleaned end might be to coat it with a smear of vaseline before putting it back as this will both protect against corrosion and help conductivity. Another alternative is you can buy silver paint (99% real silver not silver coloured!). A thin coat of this should increase conductivity no end. I guess gold plating would be the ultimate, but unless you have a plating machine, which most will not have, then I guess that's not an option for most people.
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post #9 of 18 (permalink) Old 12th January 2019, 23:55
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but unless you have a plating machine, which most will not have, then I guess that's not an option for most people.
And the wherewithal to remove the connector from the glass, replace it when plated and make good the connection to the aerial element.
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post #10 of 18 (permalink) Old 13th January 2019, 10:52
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Quote:
Originally Posted by scaramanga View Post
what is the empty terminal should there be something on there rear demister maybe ?
I already asked that question in the "what did you do today" thread but no one seemed to know. The "elememt" its connected to stops less than halfway across the screen. I wondered if it was DAB.
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post #11 of 18 (permalink) Old 13th January 2019, 10:55
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Thank you!!
Will give this a go as soon as i'm home
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Originally Posted by JonnoG View Post
Going to give this a go in the morning also as the reception on mine drops in and out something chronic at times
Enjoy taking the pastic panel off, its murder. The main 5 plastic poppers are all along the middle, so concentrate on pulling from there.
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post #12 of 18 (permalink) Old 13th January 2019, 11:10
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If you look at this diagram you will see the radio amplifier (#9) and the loom (#12). You can see the grommet that goes through the C pill inside the hatch back area than you will also notice what I think is another Ground point as #14 is clearly call a Bolt, Earth.



https://www.lingshondaparts.com/part...ckref/B__1601/
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post #13 of 18 (permalink) Old 13th January 2019, 18:24
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Cheers for the heads up and the drawing Das, didn't get round to doing anything on the car today so will try to crack on with this during the week
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post #14 of 18 (permalink) Old 15th January 2019, 12:34 Thread Starter
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Enjoy taking the pastic panel off, its murder. The main 5 plastic poppers are all along the middle, so concentrate on pulling from there.
I'm having a very hard time getting it off at the moment!
Did you use any tool or anything? Or just force?

I feel like pulling any harder than I already am might break whatever clips are holding it in place :/

How did you do it? Did you pull the top (window-side) first or the bottom (tailgate hinge side) first?
Would you mind posting a pic of where the poppers/clips are?
Thank you!

Last edited by GoldenOne; 15th January 2019 at 13:22.
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post #15 of 18 (permalink) Old 15th January 2019, 13:50 Thread Starter
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So I managed to get the trim off, and I do have all three plugs there. The middle one seems is connected to a shorter ariel in the glass it seems. Not sure what its for

I gave the contacts a clean using WD-40 contact cleaner, though unfortunately it doesn't seem to have helped at all :/

Does anyone know if its possible to install a third party antenna in the 8th gen civic?

Last edited by GoldenOne; 15th January 2019 at 14:05.
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post #16 of 18 (permalink) Old 15th January 2019, 20:07 Thread Starter
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Another update! It seems that actually the issue isn't with the radio antenna itself, but with the car's 12v accessory socket.

I had my dashcam cable routed to the boot and plugged into the socket there, and unplugging it immediately made the issue dissappear!

I've tried the front socket and it seems to be better but still present.

I've tried a different socket to USB adapter from my old tom-tom satnav and that seems to work fine so I'll order a cable and switch to that.


Radio reception is still a bit meh but hugely better than before.
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Last edited by GoldenOne; 15th January 2019 at 21:57.
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post #17 of 18 (permalink) Old 16th January 2019, 04:16
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Another nail in piggybacking and our advice to use the Option Connector is proving a far better option.
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post #18 of 18 (permalink) Old 16th January 2019, 19:31
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Originally Posted by M8TJT View Post
And the wherewithal to remove the connector from the glass, replace it when plated and make good the connection to the aerial element.
You can gold plate in situ, at least for the spade end's exposed parts. The connector plug would be another matter.

However, it shows short sight by Honda and unnecessary penny pinching by not using plated connectors in the 1st place in an area that would be likely to be exposed to corrosion through condensation.
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