Radio has interference - 2000 Dodge Intrepid

The rear screen heater is a pure resistance being fed with direct current and normally will cause no radio interference as it does not vibrate or oscillate, though a loose or dirty connection or dirty switch could produce interference.

Some cars use the rear screen as a radio aerial and these are prone to producing radio interference, especially when trying to receive vertically polarised signals.
I tried this myself using a bi-fi rear screen aerial adaptor and was very disappointed with the results, the signal-to-noise ratio was appalling.

If your car uses the rear screen as an aerial there is likely to be a box of electrickery physically somewhere near the rear screen where the aerial cable originates. This box contains stuff to decouple the radio signals from the HRW circuit and will probably contain a signal amplifier.

The static you hear might just be a drastic reduction in signal strength rather than actual generated interference. You can do little else but to check the connections to and from the unit particularly the ground connections and check the voltages present on the related wiring. If no external faults are found it is likely the box of electrickery has failed.

Spending a while looking at dedicated forums might help further.

I am assuming that you mean that you are receiving interference on your radio. (Your description is very unclear.)

Window-mount antennas are notorious for bad reception and allowing interference. Your best course would be to mount an after-market external antenna on one of the fenders.

The other option would be to replace the stock Yaris radio (which is very poor quality) with a BETTER after-market radio.

Having a failure while driving past the same spot leads me to believe your experiencing electromagnetic interference (EMI) also called radio-frequency interference (RFI) when in the radio frequency spectrum.

Find more info here:
Electromagnetic interference

EMI or RFI interference typically emanates from intended transmissions, such as radio and TV stations or mobile phones. Automobile ignition systems also generate changing electrical currents and voltages that can cause EMI..

Broadband EMI or RFI interference is unintentional radiation from sources such as electrical power transmission lines.

With that said, your ignition module may be adversely affected by an outside source. Ask you mechanic if he can
shield your module to see if that solves your problem.
The ignition module is located in the front seating area, passenger side, under dash, mounted above kick panel.

PS: What happens if you drive in a different direction for 10 minutes...does the failure still happen?

You have a shop put an oscilloscope on the
alternator & look for bad diodes in it.
If that isn't the issue then they some difficult
troubleshooting ahead
Could be a bad fuel pump or hvac motor
Something is putting a frequency on the
electrical bus

hi Scott, sounds like feedback try earthing your radio to the bodywork.
good luck Scott Craig

is bad wiring, has interferences. You mus wiring again you radio, for not interfere with the system. In other words your radio has to get clean system, and Not corrupt.

Interference may be caused by non - resistor spark plugs. If you don't want to change your plugs for resistor plugs, you may be able to get an inline resistor for the antennae from your local electronics supply store, like radio shack. Failing that, you can buy a cb antennae with a built in resistor coil that will also do the job. If you buy the new antennae, go to a cb shop to have your antennae tuned to your cb - it will increase your range and clean up your sound too.
Hope this helps, and please rate my solution!!

Ignition Coil Removal

1. Disconnect fuel charging wiring connectors from ignition coil (12029) and radio ignition interference capacitor (18801) .
   

1. Disconnect ignition wires by squeezing locking tabs and twisting while pulling upward.
2. Remove four ignition coil retaining screws and remove ignition coil and radio ignition interference capacitor . Save radio ignition interference capacitor for installation with ignition coil .
   

Installation

1. Position ignition coil and radio ignition interference capacitor to ignition coil mounting bracket.
   

1. Install retaining screws and tighten to 4.5-7.0 Nm (40-61 lb-in).
   

1. Apply Silicone Dielectric Compound D7AZ-19A331-A (Motorcraft WA-10) or equivalent meeting Ford specification ESE-M1C171-A to all ignition wire boots.
   

1. Install each ignition wire connector to the proper terminal on the ignition coil . Make sure boots are fully seated.
   

1. Connect fuel charging wiring (9D930) to the ignition coil and radio ignition interference capacitor .
   

You have a RFI problem that's radio frequency interference. you need and RFI strap for radio to radio attena or an RFI strap from chassis to engine. hope this helps. this is the only way to get rid of unwanted RFI. good luck!

please rate highly if this helps.

Visual Inspection Chart Mechanical Electrical

• Integrated control panel (ICP) physically damaged, misaligned, any control(s) inoperative
• Digital audio compact disc player physically damaged, misaligned, any control(s) inoperative
• Antenna or antenna cable physically damaged, misaligned connection(s)
• Radio speakers, mounting/speaker cones physically damaged, misaligned
• Radio ignition interference capacitors, radio frequency interference suppression bond misaligned (also check for cleanliness and metal-to-metal contact)

• Battery junction box (BJB) fuses F127 (5A), F117 (20A), F127 (5A).
• Central junction box (CJB) fuse F227 (10A) F211 (15A), F216 (15A), F226 (10A) (wagon only)

battery box is under hood.

CJB is on left side of dash