Fair enough. As for the hotwiring, you do have a point with random Joe not having a clue of what this is. My thinking was that all they would have to do is send 5 volts to the pin on the Arduino but when I think about it more, there are like 20+ pins on an Arduino nano.
Speaking of which, to use the access controller with the Arduino, just set up the relay on the controller to short one pin of the Arduino to 5v from it’s supply. Then program it so that when that pin gets power, do whatever you would have when an I’d is validated
Yea there’s no way someone can figure out the thing.
Yes usually called an immobilizer. It actually is a small rfid chip inside your key and if the car doesn’t see that chip, it will not start. Therefore, if robber joe doesn’t have your key, they are shit out of luck.
The issue is that my goal with this project is to not carry keys… So I need to bypass this immobilizer for my project to work. Therefore, someone could just cut off all of our custom work and hotwire the old fashioned way.
There is something called an immobilizer bypass module that can bypass the immobilizer without compromising security but I don’t have one.
Couldn’t you hook up the immobilizer to the arduino? That seems like a very secure way to do it imo. That way someone still would have to rip everything out to hotwire it.
This would do exactly that. The immobilizer bypass essentially copies your key chip and gives it to the car when it gets a signal from the Arduino. The only problem is I don’t have one and I’m too lazy to get one.
Are you simply removing your immobilizer? I’ve got just about everything I need, and have just about got the arduino figured out. I’ve been looking at the immobilizer bypass modules, and im not sure they’re worth it. Especially i really doubt someone would ever try to steal the car as it’s a stick.
Do you have any links to that module
What is your immobilizer set up?
Starter motor, fuel pump, key or ECU?
You should be able to bypass without a specific module
Bypass modules are great when you want 2 ways of starting a car, like a remote start - I.e. only bypass if by remote but don’t bypass if using a key so a hardware store copy won’t start the car. It’s a nice touch to have a bypass you can ‘turn off’ electrically, but not strictly needed depending on your threat model
I took the electric guts out of my key and literally duct taped it to the immobilizer reader. Then I removed the key cylinder while stuck in the on position and cut the communication line to the key switch. This way, the car gets nothing from the switch and sees it as off. Then, when my custom setup is triggered to start, a relay reconnects the data line and the car sees the switch as on. This disengages the shifter interlock and acts like the key is in the in position. I then would use relays to send the 12v line to the ignition wire and the starter wire to start the engine. Turn off the starter wire after the engine catches and you are all set. At this point if I hadn’t stuffed the key guts in the reader it would shut itself off because it didn’t see the chip. Then just disconnect all the relays to shut the car down. When i Finish the project with Arduino ill make a more detailed explanation and kind of tutorial. The problem with my method of bypass is that anyone who knows how to hotwire can just do what the relays do by hand (touching wires together).
It looks for the chip in the key on engine start and if it isn’t found it forces the engine to turn back off. Not sure how but it does.
The bypass module I’m thinking of would have the key guts put in it and it would be hidden somewhere. It then uses its own coils to copy the signal of the key and broadcast it near the immobilizer reader only when you tell it to via a wire to the Arduino. It’s much better than my lazy ass method since someone can’t hotwire unless they find the hidden module. And, it works by tricking the car into thinking it sees the chip so it doesn’t really matter how the immobilizer would shut off the car but it also let’s the immobilizer do its job when needed.
There are probably other ways of getting around the immobilizer but this type is the one I’m familiar with (and too lazy to buy)