SL55/63/65/R230 AMG: No 12V Power to my command module / radio
Thread Starter
Newbie
Joined: Jun 2025
Posts: 8
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From: Austin, Tx
2008, SL65, AMG
No 12V Power to my command module / radio
I'm really struggling to find the cause of "No" 12V Constant power to my Command Radio in my 2008, AMG, SL65.
Have checked all fuses under the hood, left side. Checked all fuses behind passenger seat.
Also checked the relays behind passenger seat & all good.
Any suggestions would be very much appreciated.
In the last thread reply were fuse locations. Rechecked all again and all seem to be good.
Are there more fuses in the trunk that would control the 12V constant power to the Radio Command Module?
Have checked all fuses under the hood, left side. Checked all fuses behind passenger seat.
Also checked the relays behind passenger seat & all good.
Any suggestions would be very much appreciated.
In the last thread reply were fuse locations. Rechecked all again and all seem to be good.
Are there more fuses in the trunk that would control the 12V constant power to the Radio Command Module?
Thread Starter
Newbie
Joined: Jun 2025
Posts: 8
Likes: 0
From: Austin, Tx
2008, SL65, AMG
lost 12V Constant power to my Radio Command Module
Hi all,
Does anyone have any advise they could offer regarding my 12V power loss to my command Radio Module in my 2008, SL65 Merc??
Does anyone have any advise they could offer regarding my 12V power loss to my command Radio Module in my 2008, SL65 Merc??
Thread Starter
Newbie
Joined: Jun 2025
Posts: 8
Likes: 0
From: Austin, Tx
2008, SL65, AMG
Hi,
No, in the 2008 there's not a fuse in the back of the command module.
Also its the 12V constant wire that plugs into the command module which has no power and can't figure out why.
No, in the 2008 there's not a fuse in the back of the command module.
Also its the 12V constant wire that plugs into the command module which has no power and can't figure out why.
Super Member
Joined: Sep 2021
Posts: 537
Likes: 116
From: Ann Arbor, MI
2004 SL600
The2008 fuse diagram shows that its F16 on the left front fuse box, a 5 Amp fuse:
f16 15R Valid for code (352) COMAND operating 5
With ignition on, check both sides of the fuse for +12V.
f16 15R Valid for code (352) COMAND operating 5
With ignition on, check both sides of the fuse for +12V.
Thread Starter
Newbie
Joined: Jun 2025
Posts: 8
Likes: 0
From: Austin, Tx
2008, SL65, AMG
Thank you for the reply.
With the ignition on is auxiliary 12V.
We need constant 12V with the ignition off to the command correct?
Also checked F16 and the fuse is good.
Do you happen to have the fuse chart locations / descriptions you could share? I've was told by other forum chat that the fuse location for the command constant 12V is behind the passenger seat. Well also checked all of those fuses and relays. All good so still at a loss what to do next. I even thought that maybe the 12V constant wire somehow got severed when we connected a T-Tap Wire Splice connector to the 12V Constant because it did provide power for a short time. Really at a loss here but also really appreciate your kind responses.
With the ignition on is auxiliary 12V.
We need constant 12V with the ignition off to the command correct?
Also checked F16 and the fuse is good.
Do you happen to have the fuse chart locations / descriptions you could share? I've was told by other forum chat that the fuse location for the command constant 12V is behind the passenger seat. Well also checked all of those fuses and relays. All good so still at a loss what to do next. I even thought that maybe the 12V constant wire somehow got severed when we connected a T-Tap Wire Splice connector to the 12V Constant because it did provide power for a short time. Really at a loss here but also really appreciate your kind responses.
