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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 05-10-2015, 10:25 AM   #1
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Join Date: Aug 2006
Location: Australia
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Automated Hidden Menu for E46

Hi there,

I'm not a regular poster here but do browse from time to time. I'm pretty happy with this little project I've worked on the past few months and wanted to share it.

Basically, I wanted a digital speedo in my dash and remembered that hidden menu 7.3 was available. I though about automating the process of pressing the reset trip button 19 times, waiting for it to turn "off" etc.

First I noticed this could be done while the engine is running, only issue is the engine can't be started during it's 20 second process or it loses its position and you have to start the process again.

So I have used a little Arduino box and built the circuit and software to get this to emulate the hidden menu procedure and menu 7.3 on the reset trip button:

It also starts up for me automatically after about 1 min of turning to ignition 1. I also have access to other menus with this setup - 7.0, 7.2, menu 4.0 current milage, 6.1 fuel tank in liters and 9.0 battery voltage.

Only problem for you US/UK guys is it seems menu 7.3 is in km and doesn't look like it can be changed to miles.
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Old 05-10-2015, 06:47 PM   #2
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Join Date: May 2013
Location: Rockville, MD
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My Ride: 2002 Touring
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so how exactly did you do this?
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Old 05-11-2015, 07:40 AM   #3
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nice! How was it done?
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Old 05-11-2015, 12:26 PM   #4
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Thanks guys. It was countless hours work and felt like someone else would appreciate it. I'll be happy to supply more info if anyone wants to try this too.

I first had to open up the dashboard and solder in 2 wires to the reset trip button (should have used thinner wires as it was a tight fit out of the dash).

I used and programmed an Arduino Uno clone to simulate pressing the button for the set amount of times to get into the hidden menu (sits behind dash). The Arduino controlled this through a relay on a circuit I put together. The circuit and box turned out to be larger than I wanted and had to install it behind the glove box!

I also had to route the BC wire going from the BC stalk to the car via the Arduino for it to register the driver's BC press.





There is actually an E46 module you can buy that does something similar - it displays your speed on the BMW radio display http://static.schmiedmann.dk/Manualer/EKOMBI1_E46.pdf and is controlled by the BC button. I had bought and installed this already, so had a bit of a head start on what to do, but never liked the digital speedo just out of view so worked on my own.
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Old 05-11-2015, 01:59 PM   #5
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Very nice; well done!

DIYs help you save money with repairs; let www.bmwpnpc.com help you save money with the parts.
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Old 05-11-2015, 05:51 PM   #6
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That's nice work! I sincerely hope I never have to pay that close attention to my speed though...
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