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      05-28-2019, 04:10 PM   #16
TLK
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Drives: '14 M5 CP, '12 550i, '04 545i
Join Date: Sep 2016
Location: SF Bay, CA

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Do you need one or two buttons on the Homelink mirror to control EM? The demo videos do look at times like the guy alternated between two buttons on the remote fob.

There seem to a number of 12V powered remote RF switches similar that can be used to build an exhaust control. $139 seems pretty steep just for a system with the OEM plug ends. It just has to be in the same ~400 MHz band that Homelink uses to integrate it similarly.

Dwaynos, if you get a 3 position switch you can have ECU, open, closed if you wish on your hardwired setup. For the closed position, just don't connect to anything, and leave the line floating. That's how the ECU closes the valve.
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