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AM Radio Interference in Jeep Patriot

09/28/2015 7:18 AM

I have an 08 Jeep Patriot. The radio gets sporadic radio interference in the lower AM stations (under 1000). switch in on position (engine running or not) hit a small bump goes away, hit another it comes back. No adverse effects on AM 1000-up channels or on FM. It started after having front struts replaced. figured it was a ground strap issue but all look good.Any ideas? (I replaced the RF filter already)

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#1

Re: AM radio interference in Jeep Patriot

09/28/2015 7:29 AM

Its a connection somewhere.

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#2

Re: AM Radio Interference in Jeep Patriot

09/28/2015 8:17 AM

There is a rats nest of wiring in the left fender well area.(I figured I'd look where they were messing around with the struts first) I checked all connectors there and found one that was all cheesy. I fixed it. I was hoping someone would have a direction or Idea where to look next. (All-data pictures suck and the dealer won't release schematics)

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#3

Re: AM Radio Interference in Jeep Patriot

09/28/2015 9:07 AM

The first place to look is the antenna.

When antennas start to go bad the AM picks up all the engine noise and interference.

Some radios had a small tuning capacitor used to match the car's antenna to the radio. I have no idea if that is the case on your vehicle, but the dealer should be able to adjust that.

My bet is that the antenna is bad or has a poor ground.

The other thing would be to pull the radio and rap on it with your hand to see if it either initiates the problem or makes it go away. If it does, then you need the radio repaired.

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#4

Re: AM Radio Interference in Jeep Patriot

09/28/2015 9:15 AM

Thanks, I'll check the antenna. I didn't think that was it tho because the interference is there with the ign. in on position engine running or not running.

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#14
In reply to #4

Re: AM Radio Interference in Jeep Patriot

09/29/2015 12:04 AM

It won't be the antenna. The antenna for AM is a ferrite coil inside the unit. If that is the problem, then it might have loose mounts. The external antenna is for FM.

You may have a loose ground to the radio box itself. That would mess with the AM reception.

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#18
In reply to #14

Re: AM Radio Interference in Jeep Patriot

09/29/2015 12:43 PM

Really? When did they start making auto radios with an internal antennas for AM?

Considering the car is metal that would make reception difficult if not nearly impossible.

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#5

Re: AM Radio Interference in Jeep Patriot

09/28/2015 9:17 AM

Loss connection may be, unplug and plugged power adapters.

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#6

Re: AM Radio Interference in Jeep Patriot

09/28/2015 10:19 AM

Maybe you have a loose or damaged sparkplug wire...

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#7
In reply to #6

Re: AM Radio Interference in Jeep Patriot

09/28/2015 11:10 AM

It happens when the engine is not running as well. If the key is in acc.position works fine but in on position problem starts.

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#9
In reply to #7

Re: AM Radio Interference in Jeep Patriot

09/28/2015 12:04 PM

Probably something like the fuel pump.

I stand by my antenna problem theory.

I used to test that by taking a standard whip antenna and connecting it to the radio, grounding the base at a convient location and if the noise stopped I knew it was a bad antenna.

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#10
In reply to #9

Re: AM Radio Interference in Jeep Patriot

09/28/2015 12:39 PM

I'll try that tonight. Thanks

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#8

Re: AM Radio Interference in Jeep Patriot

09/28/2015 11:49 AM

Sounds like a ground problem.

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#11

Re: AM Radio Interference in Jeep Patriot

09/28/2015 7:37 PM

Pacific Coast Manuals offer FSM's for under $12.

Jeep Compass & Patriot Forum - JeepForum.com

The above link is one of several online forums that are specific to your year and model.

There used to be a braided cable from the center of the firewall to the block specifically for engine noise. I'm assuming you've disconnected the cellphone etc chargers to eliminate them.

Let us know

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#13
In reply to #11

Re: AM Radio Interference in Jeep Patriot

09/28/2015 11:15 PM

You brought up a good question about cell phone chargers, I listen to a AM station (740) out of San Fran and have had radio noise will my cell phone was plugged in, with or without the engine running! Unplug the cell phone or tablet and the noise goes away

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#12

Re: AM Radio Interference in Jeep Patriot

09/28/2015 8:59 PM

DDefine the noise please.

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#16
In reply to #12

Re: AM Radio Interference in Jeep Patriot

09/29/2015 6:49 AM

It was a white noise like you get when at the outer range of a radio station,only louder.

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#17
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Re: AM Radio Interference in Jeep Patriot

09/29/2015 9:27 AM

Oh, like your antenna was corroded and the radio wasn't getting a signal.

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#19
In reply to #17

Re: AM Radio Interference in Jeep Patriot

09/29/2015 1:01 PM

The corrosion was grounding the antenna to the fender over the rubber bushing holding the mast base shorting it out so yea, like not having an antenna at all.

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#15

Re: AM Radio Interference in Jeep Patriot

09/29/2015 6:47 AM

Hero nailed it, The antenna was corroded where it connects to the cable on the fender. I cleaned up the connection and replaced the antenna with a new one. With this happening at the same time the struts were replaced was just a fortunate coincidence(I found the cheesed up connector that was due to attract gremlins soon.

Thanks to all for your advice. The phone charger issue is good to know.

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#20
In reply to #15

Re: AM Radio Interference in Jeep Patriot

09/29/2015 2:39 PM

So glad that you got it fixed.

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#21

Re: AM Radio Interference in Jeep Patriot

09/29/2015 5:35 PM

Something is not grounded well. My dad had a noise issue on a pickup truck. The brake lights started acting up. A ground strap was put between the cab and the bed of the truck to fix it. That also fixed the radio noise issue. You might need one on the hood.

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#22
In reply to #21

Re: AM Radio Interference in Jeep Patriot

09/30/2015 7:24 AM

That was the first thing I checked. All ground straps (5 in all) were in good condition. The corrosion was on the antenna itself shorting over the insulator mounting it to the fender.

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