SL/R230: Device Unavailable - Command Unit
Thread Starter
MBWorld Fanatic!
Joined: Aug 2004
Posts: 1,875
Likes: 4
From: Tallahassee, Florida
2006 SL600, 2001 S500, 1996 SL320
Device Unavailable - Command Unit
In my 06 SL600 today when starting the car the command unit comes on, but then instead of showing anything, like a radio station or CD or Map, a small message comes on and says "DEVICE UNAVAILABLE" and then the unit shuts off.
In the past after leaving the car sit for several days I would get a message in the instrument cluster saying convenience items unavailable, but then after running the car for a few minutes that would go away and items like the steering wheel moving up and down would work again.
Any ideas????
In the past after leaving the car sit for several days I would get a message in the instrument cluster saying convenience items unavailable, but then after running the car for a few minutes that would go away and items like the steering wheel moving up and down would work again.
Any ideas????
Thread Starter
MBWorld Fanatic!
Joined: Aug 2004
Posts: 1,875
Likes: 4
From: Tallahassee, Florida
2006 SL600, 2001 S500, 1996 SL320
Just went out
Just went out to run some errands, got in the car, started it up and the command unit was up and running, noticed the clock on the dash was working too. Maybe the convenience battery was low, not sure, but oh well for now it is working again.
Senior Member
Joined: Nov 2003
Posts: 367
Likes: 0
From: Scotland
2004 SL500, 2007 R350 Sport
I've had the "convenience functions temporarily unavailable" quite a few times but never "DEVICE UNAVAILABLE" and shutting down. COMAND was always available. Doesn't sound like the same thing to me.
If it happens again try your heated seat - if the led's on the seat switch flash the battery's low. That's what happens when I get "convenience functions temporarily unavailable".
If it happens again try your heated seat - if the led's on the seat switch flash the battery's low. That's what happens when I get "convenience functions temporarily unavailable".
Newbie
Joined: Nov 2007
Posts: 9
Likes: 0
e55
when battery voltage gets low the car will go into proitization (sp) and consumers will go offline.. if your having comand problems that can be a whole diferent story. you may have a problem with your fiber optics or the MOST RING.
Former Vendor of MBWorld
Joined: Dec 2005
Posts: 827
Likes: 152
From: Simi Valley, California
2018 C63 Sedan
Had dealer install Mercedes trickle charger in trunk so that all I have to do is plug it into wall when the car sits more than a day or two and it ended those kinds of problems
Newbie
Joined: Dec 2007
Posts: 2
Likes: 0
2004 SL500
My 3 year old SL500 with 11,000 miles on the clock comes up with "Convenience functions temporarily unavailable" whenever the car is left more than 18 hours without a drive. Within 5 miles the battery recharges so it all kicks back in again. If I leave it a week, you even have to use the metal bit of the key to get into the car.
I took it to Mercedes Benz main dealers 2 weeks ago thinking they would fit a new battery but was told that they had detected a drain on the battery but didn't know where it was coming from. (They thought it might be a fault with the EIS, or maybe with the immobiliser)
I took it back in for further tests this week and was then told that they could not detect any fault, and that the battery was fine, and that they had just recharged the battery and that everything should now be fine.
2 days later the "convenience functions-----etc" is coming back on again.
Any ideas what is going on?
I took it to Mercedes Benz main dealers 2 weeks ago thinking they would fit a new battery but was told that they had detected a drain on the battery but didn't know where it was coming from. (They thought it might be a fault with the EIS, or maybe with the immobiliser)
I took it back in for further tests this week and was then told that they could not detect any fault, and that the battery was fine, and that they had just recharged the battery and that everything should now be fine.
2 days later the "convenience functions-----etc" is coming back on again.
Any ideas what is going on?
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Senior Member
Joined: Nov 2003
Posts: 367
Likes: 0
From: Scotland
2004 SL500, 2007 R350 Sport
I had the exact same problem. Found out it was the telephone wiring. It was draining the battery even with no phone connected.
Only get that warning if the car's not driven for 2 weeks+ now.
Only get that warning if the car's not driven for 2 weeks+ now.
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