SSFinest

Is anyone experiencing this problem? When I start my GLK the command screen does not light up with the MB logo. It sometimes takes up to 10 mins before the screen is on. I can listen to the radio or my ipod and all that but the screen just sits black pointless if I needed the Navi. I was wondering if the screen needs to warm up as it been pretty cold here in Calgary. This only started happening when the temp dipped below -5C.

NYCGLK

-5 C already...I haven't had any issues here yet (knock on wood), but temp has not been bellow +10-15 C around here yet.

I don't think that screen needs to warm up, unless MB has a safety feature to prevent screen from being damaged. There is actually a vent for blowing air on the screen, not sure if there is real purpose behind it (de-fog?). But LCD's work in cold they just become rather slow. Check manual, maybe it says something about this.

JT01

I'm in Edmonton. It's been subzero here as well and I haven't experienced this. My nav screen has no delay and I park outside... knock on wood!

gdepau

The command screen should not take 10 minutes to warm up. 30 seconds is all it needs. I would let your dealer know. Good luck!

SSFinest

Thanks. I just called MB and talked to a service advisor and he said that the screen should not be doing this and that it does not seem normal. I will be brining it in next week for them to check on it. I will let you guys know what the problem is.

georgecramjr

I have the same problem with my 2010 GLK, It doesn't happen all the time though.Took it to dealer and they said it was a software update thing.
Still happing after update. Will need to call dealer again.

GLKKa2H

When you state “have the same problem”, I assume you have environmental temperatures like SSFinest.

As the problem is intermittent, does it occur (only) when you turn the COMAND on, when the GLK interior is cold? If so, I would say the problem may not be solved by software update, rather than being a part of the nature of a Liquid Crystal Display (LCD). The COMAND screen is LCD.

Standard LCDs do not operate over an extremely wide temperature range, as MIL-STD specified ones does. Standard operating temperatures may e.g. range 0°C to +50°C, -10°C to +60°C or -30°C to +80°C, dependent on type of LCD. Actually can the crystal material freeze and recover, or can permanently be damaged by very low temperatures.

The LCD (sceen) is supported by electronic cicuitry to display, whatever that may be, and to provide backlight for it. The backlight voltage is required to start the LCD, and must be carefully designed to make the LCD (screen) operate over its specified temperature range. In your case, given the software update was to optimize the backlight voltages (or any other parameter required to “enlight” the display), which did not work, I would say the culprit could be the LCD itself, not meeting requirements.

The Navi of our former car had problem as reported by the OP, meaning starting at approx -5°C, and came into normal display (no distorted colors) within a 5 – 10 min. timeframe, dependent on how low the environmental temperatures were. In our case did we live with it – because of the nature of a LCD.

georgecramjr

Thanks for the update and info, yes this does only happen when I first start it up and it is like only 10 degrees out. Funny thing my dealer called and said it might be cold weather. They want to replace a part to see if it makes a difference. I'll take it in next week.

MKenM

It has been in the single digits a few times and I have never had a problem with my COMAND display. Thankfully.

n8nu

I have often gone out and started my GLK and it's been -15C or -20C and my car is parked outside.

No issues - screen starts up immediately. Don't know if it makes the diff, but I've got the 7" Command screen.

GLKKa2H

Or maybe MB (should) use a screen with a wider temperature spec. in GLKs sold on the Canadian market

georgecramjr

Had no screen this morning when I started up. Turned vehicle off for 2 min and restarted, the comand screen came back on.
Some kind of glich in the LCD screen.

MBRedux

Yup... it appears to be common... still waiting for ours to fail.

georgecramjr

Had the LCD screen replaced on my GLK 350 at the dealers yesterday, hope this is the answer to all those blank display screens. Keeping my fingers crossed. Will keep posting if any more issues.

georgecramjr

New LCD screen seems to have done the trick, mb does know about this issue so if you are having an LCD screen on your comand unit not lighting up let your mb dealer know, they know what it is and it is an easy fix.

MBRedux

What do you mean "easy"? The whole unit must come out and be replaced from what I hear. That's a BIG job! Is it something else?... Easier? Please tell.

georgecramjr

My service manager said it was just the screen they changed out and it was done in a couple of hours I was told. I did leave the vehicle there all day so not sure the accual time it took them. However the screen seems to be coming on ok now. No black outs sense they changed it last week.
The original trip to the dealer was they said there was a bulletin on this problem and that there was a part to change out. This was under waranty anyway. I don't think cold weather had anything to do with it anyway.

MKenM

Just curious, any squeaks or rattles from the dash now?

georgecramjr

No rattles or squeaks, I can't even tell the dash came off, no sign of any work just a new LCD screen.

MBRedux

I would love to know what this "part" number is?

georgecramjr

As soon as I get the paper work from Prime Motor Cars I'll let you know, or you could call them at 1-888-499-9401 and ask for Mohamad in the service dept. He is my service man. This is in Scarborough, Me

MBRedux

We frequently visit the Carrabassett Valley and ski Sugarloaf. We Love Maine!