arcnspark

All,

My new to me 2016 E350 did something strange today.
As I live in Florida while shopping the car was parked outside in direct sunlight.
The car has dark tinted windows and the sunroof shade was closed.
The temp was about 95 deg.
When I returned the side windows were opened about 2-3” and the sunroof was opened to the vent position.
I thrived to find something in the owner’s manual to no avail.
Anyone have an answer?

TIA
Dave in sweltering Florida

LILBENZ230

Did the unlock button on the key perhaps get inadvertently pressed/held briefly? That is usually the explanation behind this type of thing.

arcnspark

I don’t think so, but I will pay more attention the next time the car is parked outside for an extended time.

nota_amg

did you use the key fob button to lock, or do you have and use the keyless lock option on the handle?

nota_amg

I ask because if you hold the key close the the handle(little square window on handle) and hold the unlock button on the remote, it will open all windows and the sunroof until you release the button. will close all with lock button on key as well(as will holding the "lock" divot on the door handle if you have keyless option).

95Sinned420

There is a convenience feature where you can open all windows and sunroof at the same time, remotely with the key fob. This has been a feature since the 90s (at least in my 140 S class). To do this, hold down the unlock button on the key fob while you’re a few feet away from the vehicle. All windows and sunroof will open. To close, hold down the lock button.

You may have accidentally held down the unlock button with the key in your pocket, squeezed by other keys or objects. This happened to me once while I was squatting (pants stretched over thigh where I keep keys) and the pressure from the objects/keys in my pocket pushed the unlock button and held it down.

konigstiger

As mentioned may have unintentionally activated convenience opening.

arcnspark

Yes I use the key fob to lock the car, and yes, I have the door handle lock option although IIRC I never used it.....yet.

Arrie

Strange as in my to cars the convenience opening works only if I'm close enough to the car and aim the end of the key FOB to the small square "window" in the driver's door handle.It will not work if key is in the pocket.
I think it is IR beam and must have clear path from key FOB to the receiver on the door handle.

95Sinned420

Can you take a pic of the IR window in your handle? My 2014 with keyless go doesn’t have that. However, my old W140 had that IR window.

nota_amg

Correct, the "convenience opening" feature is only available thru IR transmission, all other functions of the remote are RF.

LILBENZ230

Are we sure the IR thing is true for the 2016? I remember the IR sensors and how close you had to be. My 2016 has no sensors like that and also will open the windows from quite a long distance.

95Sinned420

This information is incorrect. For at least MY 2014, with keyless go, there is no IR. You simply need to be nearby with the key detected, hold down the unlock button and the opening sequence begins.
And yes, I did just test this while I was standing at the hood of the car, with the key in my pocket.