I’d like to add an auto dim mirror to my w124. Everyone loves to drive around with their high beams on for some reason. Was wondering if homelink garage door buttons can be disabled somehow while the car is off. I’d like them to only work while the key has the ignition on. My neighborhood has too many problems with homeless breaking into cars then just hitting the garage button to get into the house. Would splicing that power into a switched 12v make it loose it’s memory?

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1993 e300
1995 e320
1994 e320
2006 s500 4matic
2004 Jeep wj overland
2001 Ducati 748
2004 Honda shadow aero

is it active all the time on some cars? The buttons in my E320 (2001) and GLK250 (2015) only work with the ignition on....in at least position 1

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

I had a 99 w210 and if I remember right it would work anytime.. I also have a 04 grand Cherokee. Same thing was active 24/7

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1993 e300
1995 e320
1994 e320
2006 s500 4matic
2004 Jeep wj overland
2001 Ducati 748
2004 Honda shadow aero

my 1999 E320 functions only when key is in 1 and 2. it does not function when
ignition is in 0-off position, with or without key

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-- raymond~
47º 34'N 122º 18'W