You're welcome!

Karen redefined.

Karen with a heart of gold.

All of my knowledge is self-taught. Lots of research, and not being afraid to ask questions if I don't understand something or just /think/ I understand something. If you have the motivation, you can learn anything on your own. Hopefully my videos help you!

I've added this to my ideas sheet for potential future episodes. Thanks for the suggestion!

Hey I noticed there wasn’t a reply to this, and even though it’s a year old and you probably found out, someone else might want to know. I’m no expert in this, so this might not be entirely accurate, but I know about other similar systems and it should be enough to get you moving in the right direction. Doing practical things with CAN busses is more like dealing with a TCP/IP network than manually shifting voltage to individual components. Getting a microcontroller and working in code would be vastly easier than trying to assemble the logic from basic components manually. You can buy CAN bus data loggers which I think can tell you what’s being sent to/from the radio. Seed Studio makes some great looking CAN bus hardware you can hook up to an Arduino microcontroller, and there may be cheaper generic options. Seed also has a great induction to car CAN bus hacking on their site. If that looks promising to you, learning some simple C programming would be a good start. By the time you get around to it, the hardware you need might work with MicroPython or Circuit Python which are way easier than C to work with… but for doing simple things even C wouldn’t be too bad and there are tons of arduino/C tutorials. That said - based on what I know about the auto industry, it’s possible that they did that deliberately to make it more difficult for people to do their own customizations/repairs. (They could just be using it as a hub too to save on wire/signal attenuation, but not likely of it works as well from the trunk as the dash.) If that’s true, they’re possibly using it like a DRM device - having each of those components send the radio a piece of data and not functioning of the radio doesn’t respond. It might not even be a simple ping/response - it could having the device send a piece of data to the radio, both perform the same mathematical function on it, the radio sends it back, and the device stops functioning if it doesn’t get s result or gets the wrong result. I know this sort of thing is common in some devices (printer ink cartridges for example) but don’t specifically know if that’s true in cars, so I might be way off. Either way, it’s possible that doing this sort of thing could void the warranty on the car if that’s a concern, and also would possibly violate the DMCA (digital millennium copyright act) in the US, so watch what you’re doing.

Man lots of typos. Not enough coffee to type that much on my phone this early. I meant to also say that if they are using some kind of function on the data to confirm it - aka a cryptographic hash- it would be pretty damn difficult to reverse engineer. In addition though, arduinos can hook up to tons of different kind of hardware! You can get, say, an accelerometer that determines and responds to changes in microseconds… thermometers, proximity detectors, LiDAR sensors, gas and particle sensors, light sensors, or read from other sensors on the network, light up lights, run motors or servos… limitless possibilities with a bit of hardware and some code to tell it what to do. I’m not an auto engineer so I wouldn’t necessarily do it for a car I’d drive on the street, but maybe you want to pump up rear hydraulic suspension pressure and reduce the front corresponding to exactly how much you’re accelerating? Or adjust a spoiler based on the speedometer value? Or automatically turn on under-car lights at night? Text you OBD messages when they pop up or when your kid drives over 80mph or if they’re making a lot of hard stops/starts/turns? A lot of this stuff wouldn’t even require working with the CAN bus. A world of possibility.

There's no need to combine parallel loading with serial to get that behavior. To cascade these chips, the first and last output become the left/right input for the shift register for serial data to cascade onto. Consider what series is... here is how the 12 bits would appear across 3 chips: a1 b1 c1 d1 a2 b2 c2 d2 a3 b3 c3 d3 You can see that d1 is the right shift input for chip 2, and a3 is the left shift input.

Do u think the problem is the voltage or the circuit?