Here’s the best low-cost way to put a fully functional engine start button in your car! Absolutely no key needed to start your car! Just press the button and go!
You may have seen others put engine start buttons in their cars, but they still had to use a key! It’s like, “really, guys? You’re adding a step to starting your car“! You definitely don’t want to be like those idiots. You, you’re much smarter than those hook-it-straight-to-the-starter guys. You know there’s gotta be a better way… and there is! Continue reading How to Install a Start Button→
The first place that I was going to install the button was in the larger hole cover that covers the hole in the dash where accessory switches go, but were not used. However, I found a better location while solving the steering lock issue. The key cylinder also operates the steering lock, but if I’m not going to use the key to start the car, the steering lock just inconveniences me. I had to remove it.
After adding the relay module and start button, as well as making some changes to the code, I wired my test circuit up to CRX to see if it could actually work. Video below…
I recently purchased a 4 channel relay module and a start button from a Mazda 3. The relay module cost me $8.49(USD) from Sain Store on Amazon.com. The Mazda 3 start button cost $25.00 off ebay.
I wrote a program for the Arduino, and put together a test circuit to see if it would work. I used LEDs to show the functions. I wrote 6 different versions of the code until I finally came up with one that worked exactly how I wanted. I’m not a programmer, so this code is rather sloppy, and I’m sure there’s a much better way to do this, but, hey, it works.
Test circuit
I’ll post the code later, after I make the final version.
I recently test drove a ’14 Honda Civic, and I really liked some of the new features that Honda has added to their vehicles. The start button intrigued me. It used to be that the S2000 was the only vehicle that Honda decided to have an engine start button on, but now it seems that has spread to their other vehicle lineups.
I wanted to put that same start button functionality on my ’91 Honda CRX. I’ve seen other people install S2000 start buttons in their Civics, but all the button did was activate the starter motor. It didn’t control the ignition or accessories. They still had to use the key for that. What’s the point of installing the button, then? It just adds an extra step to starting the vehicle!
Now, I know that you can by complete start button kits that add all the proper functionality, but they usually cost upward of $200(USD). I had the idea to make my own setup for much less, and I could use any button I like! At the heart of this project is the Arduino. The Arduino contains a Atmel AtMega328 micro controller that I will program to operate the vehicle’s accessories, ignition, and starter.
Is your check engine light(CEL) on? Getting the trouble codes from the Engine Control Unit(ECU) might make it easier to fix the problem. Here is how to get the trouble codes.
The ECU is located at the front of the passenger foot-well, under the carpet. There is a single flashing LED(Light Emitting Diode) at the center of the ECU. The LED flashes the trouble codes. Count the flashes in each sequence to determine the code.
Code 0 - Faulty ECU Code 1 - Exhaust oxygen content(O2 sensor) Code 2 - -- Code 3 - Manifold Absolute Pressure(MAP) sensor Code 4 - Crank angle sensor Code 5 - MAP sensor Code 6 - Coolant temperature Code 7 - Throttle angle(Throttle Position Sensor) Code 8 - Top dead center(TDC) sensor Code 9 - No. 1 cylinder position(1.6 liter only) Code 10 - Intake air temperature Code 11 - -- Code 12 - Exhaust gas re-circulation(EGR) system Code 13 - Atmospheric Pressure Code 14 - Electronic air control(EACV) Code 15 - Ignition output signal Code 16 - Fuel injector Code 17 - Vehicle speed sensor Code 18 - -- Code 19 - Lock up control solenoid(auto trans.) Code 20 - Electric load
