That's crazy. hopefully running some good ground straps will fix it.
Do you know if the CB system is removed this still happens?

In addition to bonding there are fairly cheap ferrite beads you could purchase to snap around some of the electronics cabling. I'll search a HAM forum eham and see if I can find anything that might help also...

DX Engineering Snap-On Ferrite Beads - DXEngineering.com

 

The handheld and 18 wheeler interference really seems to indicate that some wiring or component is acting as an antenna in which case the snap on ferrite cores mentioned above can help.

Also, if you have run any long wires (say front to back), be sure to put ferrite cores on those.

Here's hoping you find it soon.

 

i put 2 snap chokes on my coax and nada.. then i put them on my cb power wire by the battery and nada. ill try them on my "long" wires suck as the ones going to my reverse camera and my aux lights tomorrow. I've been looking for some good ground straps and can't find them anywhere.

 

ferrite needs to be a mix 31.
amazon and ebay have some.. also you could buy a braid and go to a hardware store and get some electrical connectors and make some.
or
Electric Motion Company - Telephony & CATV Products [Ultrabond II]

send IM... to much to post.

 

It is highly unlikely that the RF from the CB is interfering with the security functions, or any other system that communicates with the vehicle systems via the key fob, because these functions operate at 315 Mhz and use both digital encoding and a spread spectrum RF system. This is virtually interference proof. Look up spread spectrum if you have doubts.

Jeep knows about RF interference first hand from experience, some years ago, in Australia. Many users reported dead pedal and/or total failure when in the vicinity of cell towers. Big time oopsie.

The RF field does not have to originate inside or on the vehicle as witness the big rig encounter. Many years ago while employed by a CB manufacturer at the peak of CB popularity I had to interface with a customer with a brand new competition Porsche automobile. His complaint was, of course his engine would die when he keyed the mic. Bosch electronic fuel injection was new at the time, and shortly we determined that the RF field was the cause. All we needed to do was energize the body of the vehicle with a very small amount of RF from an external source to cause his symptoms. In the course of our encounter we also discovered that our boss's 750 watt linear mounted in his Chevy 4X4 could shut him down from any where on our 4 acre antenna range. Numerous challenges to race ensued.

Note that in the process of attempting to diagnose his issues that I energized his ground to cause failure. I am not going to mention ground again because it seems to mean different things to different people here. We were not able to remedy his concerns because the fault was internal to the Bosch system and not our equipment.

Trouble shooting these types of EMI are very difficult even for professionals and require knowledge in multiple disciplines.

To attempt to address the issues in this case it would be best to acquire a field strength meter and sniff the RF field strength in the vehicle and especially in the vicinity of the PCM and dash board. Attempt to reroute wires and cables and see if the field can be reduced. This assumes you have a very good VSWR. You must realize that the RF fields present inside the vehicle will be proportional to VSWR since the reflected power from the antenna will be radiated inside the vehicle from the co-ax shield. With the evidence presented here by the use of a walky talky as a control (good move), even a perfect antenna system would not improve your situation. That leaves reducing transmitted power as the only likely solution.

EDIT: Some success might be achieved with judicious use of RF chokes (ferrite) depending on the vehicle systems sensitivity threshold. Best to attempt to reduce common mode intrusion into the cab via methods you can research. Check your progress with the field strength meter. May have better luck with small chokes in strategic points in the vehicle harness but that should be relegated to a professional with the means to find the EMI entry point(s).


Good luck
Phil

 

I'm having similar problems with my Jeep. Just installed CB. It functioned correctly at first, now when I key up, the wipers turn on and the radio turns off. No electric door locks or security system on my Jeep.

 

This sounds like the same problem those of us running HF ham gear run into. Surprised it's only happening with 3 watts from the CB. The issue I ran into was due to Common Mode current coming back down the coax. I'd get the same results if i ran the radio off an external power supply. The solution was Ferrite beads. One or two snap on beads probably won't do the trick. It could take as many as a dozen depending on the amount of "Choke" needed. They also need to be the right mix type 31. Another option is to create a loop in your coax, about 4 inches across with 6 or so wraps and a large snap on bead going around the cables. I had to do this twice but I was running a lot more power and a difficult mount for the Ham antenna. It's kinda hard to explain. Check this link: Common Mode Currents he also has links to the best source for the beads or you could run to a Ham Radio supply store.

No guarantee this is the solution but it worked for me after hours of bonding and checking grounds etc.

 

Anyone figure out the problem??? I haven't had my wipers come on when I key up, I'm only getting feedback out of my speakers... With the help of a forum member (Chris) we tried a lot! And couldn't figure if out yet. Just wondering if anyone fixed the problem...

 

Seems like there is no solution here yet, so I would take my Jeep to the CB shop close to the truck stop at the 10/15 FWY close to Norco (I see at least one of you guys live close)
They have an awesome tech working there, and they have been helpful to me several times the last few years, when I have been working on my little antenna experiments on different vehicles.

These guys know what they are doing.
I don't have the address, but they are located just behind the T/A, on the Eastbound side of the 10 freeway. And they are listening on channel 12, in case you can't find it.

If you want to go, but want an address pm me, and I can find the address on one of my receipts..

 

Is it off Milliken?? I got my antenna mount there, but didn't know there was a tech there.. I'll probably head down there in a bit, hopefully the tech is there..