Electronics to detect M mode enabled/disabled?

tlr · 08-03-2011, 02:15 PM

How would one go about hooking into the car's electronics to detect when the M button is enabled or disabled?

Basically I want to open my exhaust cutouts whenever M mode is turned on. I have the electronics experience to rig up a microcontroller and relay to trigger the cutouts, but I don't know how to detect when M mode is enabled.

Maybe some signal on the CAN bus? I have no idea.

Avoiding anything warrenty-voiding would be nice.

Thanks.

TimberWolf_3063 · 08-16-2016, 03:14 PM

I am in the same boat! Any news on this?

http://www.m3post.com/forums/showthr...hlight=exhaust

JsL · 08-16-2016, 03:22 PM

the6M3 from the thread referenced above has the right idea:

http://www.m3post.com/forums/showthread.php?t=567553

Quote:

Originally Posted by the6M3

Tapping into the power wire for the POWER button would be a very cool idea and theoretically the best for what you'e describing. Be sure to tap into the activation signal for power on the POWER switch, and not just the illumination wire!

08-03-2011, 02:15 PM	#1
tlr Second Lieutenant 69 Rep 295 Posts Drives: 2011 M3 E93 Join Date: Dec 2010 Location: San Francisco, CA iTrader: (0)	Electronics to detect M mode enabled/disabled? How would one go about hooking into the car's electronics to detect when the M button is enabled or disabled? Basically I want to open my exhaust cutouts whenever M mode is turned on. I have the electronics experience to rig up a microcontroller and relay to trigger the cutouts, but I don't know how to detect when M mode is enabled. Maybe some signal on the CAN bus? I have no idea. Avoiding anything warrenty-voiding would be nice. Thanks. __________________ 2011 Space Gray E93 M3
	Appreciate 0 Tweet Quote

08-16-2016, 03:14 PM	#2
TimberWolf_3063 Dem Ingenör ist nix zu schwör! 28 Rep 100 Posts Drives: 2010 E92 M3 - DCT, EDC Join Date: Jan 2013 Location: Victoria, BC iTrader: (0) Garage List 2010 BMW M3 (E92) [0.00]	I am in the same boat! Any news on this? http://www.m3post.com/forums/showthr...hlight=exhaust __________________ "Ah, what music! They could never have imagined it, those pioneers that invented the automobile...that it would possess us like this, and our imaginations, and our dreams. You see, men love women, but even more than that, men love CARS!" - Alexander Fermor-Hesketh, 3rd Baron Hesketh
	Appreciate 0 Quote