KG4KPI... and with a disclaimer that I am out of practice and am in no way a master electronics ninja...
If you say "fire up the radio"... do you mean just turning it on, or actually transmitting? If you're just turning it on, I can't imagine there being enough emission from the main 12v power lead to cause enough interference to bring on this type of stuff.
Sorry... I guess that expression is a bit misleading. No issues while its on. The issue occurs when I transmit, modulated or not.
As for CB's being on an amp, I have seen numerous instances where dirty boosted CB signals infect anything with copper wiring. television, cable, stereos, landline phones.... you name it. The thing is about a CAN BUS, is that some of the stuff doesn't operate on 12v signal. Some of it is low voltage triggers.
Just to clarify... this is not a CB. Its a commercially available 10m amateur radio. The amp is home-made. The CB comment is that my son's CB, installed in my son's truck, now causes the same symptoms in my Jeep if/when my son parks his truck next to my JK and talks on his radio.
With the radio removed, did you also remove the 12v power leads you ran to support the radio/amp? If not, why not try pulling those out. If you have, I can't even begin to think of what is ailing this.
100% of all the wiring has been removed. That was a good recommendation, though. Under the right conditions, having a long wire that is not terminated can act like an antenna and bleed RF into the vehicle.
Remember that the Jeep's accessory system is active for several seconds after the ignition is switched off and key is out. Just to eliminate "internal" possibilities, I might consider also disconnecting the battery and clearing out the TIPM "memory" to see if that has any effect. Hell, even trying that bit with your son's truck with the battery disconnected. If it still does it with the battery disconnected, the Jeep might not be the problem.
That's a good idea, too. I can try disconnecting the battery on the Jeep for a bit and see if things settle down. That may help reset the TPMS system too.
There is nothing to reset in my son's truck. It's a 1983, EMP proof, retired military CUCV. If he takes his CB out, there are no transistor elements in his truck.
Part of the reason I am considering a filter (at the input of the amp) once the JK is fixed, is because the amp is a homemade system. It has a couple of hand-wound inductive coupling coils that may not be perfect. It's a really simple amp. There are two Toshiba transistors in a push/pull configuration, with supporting circuitry, of course.
I just can't get past the fact that the Jeep is affected, but the same gear in my Challenger isn't causing any issues in the Challenger. That's why I think there are legit broken components in the JK.