SL/R230: No audio from COMAND
Thread Starter
Junior Member
Joined: Nov 2008
Posts: 61
Likes: 1
From: NJ
2014 (SL550); 2009 SL550 (sold); '05 SL500 (sold)
No audio from COMAND
After sitting idle for about 5 days, I started up the '05 SL500 and noticed that the instrument cluster had a familiar warning: Convenience features not available (or something to that effect). After a short drive, they were enabled (e.g., seat heater) but I've been unable to get any audio from the radio, cd's, nav, telephone, etc. The nav and CD's work fine otherwise as, for example, I can see that the CD's are playing given the passage of elapsed time for a particular track. Any thoughts?
Thanks.
Thanks.
Member
Joined: Dec 2007
Posts: 76
Likes: 0
sl600
I believe that the car shuts off the audio amplifiers when the trunk battery is weak. Have you started and turned off the car a few times? Do you still get the warning? I think it should fix itself once the battery is charged.
Thread Starter
Junior Member
Joined: Nov 2008
Posts: 61
Likes: 1
From: NJ
2014 (SL550); 2009 SL550 (sold); '05 SL500 (sold)
Thanks.
Junior Member
Joined: Aug 2008
Posts: 65
Likes: 1
From: Houston, TX
2003 SL500, 1998 E320 Wagon
Take the car for a long ride if possible. Otherwise add a trickle charger to the main battery and let it charge up the battery. Then retest to see if the issue still exists.
Junior Member
Joined: Aug 2008
Posts: 65
Likes: 1
From: Houston, TX
2003 SL500, 1998 E320 Wagon
The trunk battery is the main battery also known as the consumer battery. The battery in the trunk runs all the electronics in your car. The battery under the hood has one sole function and that is to start the car.
Member
Joined: Nov 2001
Posts: 204
Likes: 5
From: Ca
96 P993T, 00 E55, 09 SL63
No. Recharging the engine compartment battery using external charger will not charge the trunk (consumer) battery. You need to charge the trunk battery separately.
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From: Sacramento, CA
Several MB's Superperformance MK III Cobra
After sitting idle for about 5 days, I started up the '05 SL500 and noticed that the instrument cluster had a familiar warning: Convenience features not available (or something to that effect). After a short drive, they were enabled (e.g., seat heater) but I've been unable to get any audio from the radio, cd's, nav, telephone, etc. The nav and CD's work fine otherwise as, for example, I can see that the CD's are playing given the passage of elapsed time for a particular track. Any thoughts?
Thanks.
Thanks.
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Newbie
Joined: Mar 2016
Posts: 3
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From: Kings Park Long Island N.Y.
2003 CLK 320
Newbie here
Hello all. I am have my 2003 SL500 for about four years now. Love my car.
I am having the same exact problems with my audio. Started with comfort options not avail. Now its the audio issue.I have replaced the rear battery and was very disappointed when my audio went out again. Should I also change the front battery? will this help? I also took some advice and ordered a ctek charger. any advice or suggestions would be much appreciated.
I am having the same exact problems with my audio. Started with comfort options not avail. Now its the audio issue.I have replaced the rear battery and was very disappointed when my audio went out again. Should I also change the front battery? will this help? I also took some advice and ordered a ctek charger. any advice or suggestions would be much appreciated.
Junior Member
Joined: May 2015
Posts: 51
Likes: 1
From: St. Louis, MO
SL500
You are correct, and actually, though I dislike having to replace two batteries on a vehicle, I am thrilled that MB designed the system such that you are able to utilize your actual physical key to open the vehicle to start it from the primary battery, which, in turn, while driving, will recharge the "consumer battery"; as I have, twice, absent-mindedly, left my lights on with the fogs (glad they figured that one out on the r231s) overnight, only to find that it doesn't recognize my key fob or allow me access within my vehicle in the normal approach or manner. I realize other's will have their opinions, however, my rule of thumb is 3 years unless you want to be stranded at the worst time, worst place...hence, I just replace batteries every 3 years...
