From Newsgroup: alt.2600

Disabling wireless protocols is one of the easiest tasks. The cheapest option is to create Faraday foil wrappers using aluminum foil then encase the wireless transmitters in such wrapping. Supermarket aluminum foil works fine. This method can be used for low-power devices and boards that neither run hot nor require heat dissipation to prevent heat damage.

You can disable WiFi or cellular transmitters on your automobile by wrapping the transmitters and antennae tightly in aluminum foil. Some of these devices have tiny transmitters (like a cell phone has). You may need to encase the entire board with some kind of dielectric sheathing (rubber) to prevent shorting it with the aluminum, then encase it in aluminum foil. If the transmitter is grounded to the frame of the car then then your steel car frame is part of the 'antenna'. In this case the transmitter or its wire leads would need to be disconnected from the frame and all the wire leads physically removed, or the entire wire lead encased in aluminum foil. Just disconnecting the antenna lead from the frame is not enough since the wire lead acts as an antenna.

The transmitter and any metallic parts of the transmitter and chassis needs to be separated from the aluminum foil by a non-conductive material to ensure the foil does not become an antenna itself. This can be achieved with rubberized fabric, plastic cling wrap, non-metallic duct tape or electrical tape, or spray-on rubber and spray-on dielectric coatings.

You can test this for yourself. If you encase your cell phone tightly with aluminum foil it is impossible for the cellular, wifi, and bluetooth to work. Pair the phone to a bluetooth speaker and play some music, then while the music is playing fold some aluminum foil and encase the phone tightly in a couple layers of the foil. The music data signal should no longer transmit to the bluetooth speaker. You can also test WiFi blocking by beginning the transfer of a very large file from computer to phone over WiFi or bluetooth, and then encasing the phone with Faraday foil. The file transfer should stop and fail.

Keep in mind that the casing of aluminum foil must be very tight without any tiny gaps. To be sure of 100% signal dampening it is best to wrap the foil around it several times forming multiple layers on all sides. The wavelengths of wireless transmission can traverse even a small gap or hole in the aluminum casing so it must be done, 'wire tight' to remain effective. The transmitter should be meticulously wrapped tightly in several layers of aluminum foil. To make the casing durable, after applying the Faraday foil you can brush some epoxy resin all over the foil, and even do two or three coatings of epoxy resin. This should make the Faraday wrap functional for years.

If you don't want to mess with epoxy resin you can buy a roll of aluminum duct tape at a HVAC supply store. After wrapping the layers of aluminum foil around the transmitter you can then secure it by wrapping the aluminum duct tape all around it. Then apply a cheap water-proofing seal from a spray can product such as Flex Seal or something similar. It is important to have no gaps in the Faraday wrap to prevent radio signal penetration as well as to prevent condensation. If the radio component is the type that gets hot and has a heat sink, this wrapper method might slowly burn up the electronics of the component. In that case you should not wrap it but instead you should get a service manual with information on the components so you can disable, disconnect or remove the transmitter.

The next choice is to get a copy of the factory shop or service manual for your make and model. These can be pricey. Some service manuals might require a electronic subscription fee. These factory service manuals contain detailed schematics of the various electrical and mechanical systems and parts of the automobile.

If you can't find the factory service manual then look for Chilton repair manuals at the auto parts store. See if they have the current manual for your desired make and model of automobile. Look inside to see if the manual provides specs and repair instructions for the computer and electronic systems. If such information is included in the manual then you would know what to do.

The factory shop manuals are likely to have significantly more schematic and troubleshooting information than the Chilton manuals. If you can get a copy of the factory service manual for your make and model that is probably the ticket. Hard copy is superior to digital copy for data integrity. Electronic copies are easier to browse and jump around between sections with monkey grease on your digits.

I only buy old cars then fix them up and maintain them myself. I wouldn't even buy a modern car with all the network and access-point spyware. It is cheaper to pay cash for an old model and re-build it over months of Sundays. It is also more satisfying. You can also buy kit cars to build from the ground up, ensuring no electronics of any kind exist in your automobile. There is a lot of work in that, but when it is done you have a lifetime machine for which you know every nut and bolt. Swapping out and modifying engines, transmissions, and auto parts is hacking.
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