Inconsistent window control
Thread Starter
Member
Joined: Dec 2014
Posts: 179
Likes: 29
From: Arizona
2020 GLC300 touring version (but I miss my '93 300SE W140 tank)
Inconsistent window control
The second most irritating system on my GLC 300 (after the MBUX) is the key fob-controlled windows and sunroof. The manual says to hold the unlock button of the fob and the windows will go down. Yes, that does happen sometimes, but I can't make it happen consistently.
Has anyone figured out the secret sequence that will cause them to open every time?
Has anyone figured out the secret sequence that will cause them to open every time?
Member
Joined: Mar 2007
Posts: 157
Likes: 36
From: Suffern, NY
2020 GLC300 & 2009 SL550 (previously had 1999 CLK / 2006 E500 / 2011 GL450)
I don't really use it, but this has been a MB feature for decades (we had it on our 1999 CLK and every car since).
I think for safety reasons you need to be near the car for it to work -- the older smart-keys had infrared for this aspect, but I don't know how these more rectangular smart keys work (IR or RF). You don't want someone/something to get caught in a rising window. I use it more often on my SL -- to drop the top. It has the older smart-key system and I need to be only a few feet away from the car for it to work.
ALSO, I noticed that my GLC keyless entry works inconsistently once the battery gets weak, but no warning on the dash (other MBs warned earlier). I presume this feature is also impacted by a weak battery, so unless you have the car less than a year, try a new 2032 battery. I had to change my 2020 key's battery after about 15 months due to inconsistent lock/unlocking from the door handle, and silly me assumed prepaid maintenance would change the key battery since it's on the service list... my dealer didn't.
I think for safety reasons you need to be near the car for it to work -- the older smart-keys had infrared for this aspect, but I don't know how these more rectangular smart keys work (IR or RF). You don't want someone/something to get caught in a rising window. I use it more often on my SL -- to drop the top. It has the older smart-key system and I need to be only a few feet away from the car for it to work.
ALSO, I noticed that my GLC keyless entry works inconsistently once the battery gets weak, but no warning on the dash (other MBs warned earlier). I presume this feature is also impacted by a weak battery, so unless you have the car less than a year, try a new 2032 battery. I had to change my 2020 key's battery after about 15 months due to inconsistent lock/unlocking from the door handle, and silly me assumed prepaid maintenance would change the key battery since it's on the service list... my dealer didn't.
Last edited by High Technology; Jun 7, 2022 at 08:26 PM.
