SL/R230: Ack! Command stereo wiring?
Thread Starter
Junior Member
Joined: Jan 2013
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From: SW Ontario, Canada
2010 S550 2011 E350 2000 CLK320 convertible 2004 SL500
Ack! Command stereo wiring?
Doe3s anyone know what line is going to give me my accessory turn on 12v? I have the 12v constant, the ground as well, but I am missing the 12v switched to the ignition. Any help would be great, I have totally stripped my old 04 SL500 and I am in the midst of doing a stereo upgrade. Thanks to all!!
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Joined: May 2009
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From: Santa Clara, Ca
2003 SL55 / 2002 SLK32
Doe3s anyone know what line is going to give me my accessory turn on 12v? I have the 12v constant, the ground as well, but I am missing the 12v switched to the ignition. Any help would be great, I have totally stripped my old 04 SL500 and I am in the midst of doing a stereo upgrade. Thanks to all!!
if you are not using one with that functionality, you can go old school and....
Find a "Circuit 15R" wire and use it to control a relay (and then source the power from your "constant" source).
you will find "Circuit 15R" at pin 4 of your N73 module and pin 2 of conn 1 on the K40/2 module.
Cheers,
Chris
Thread Starter
Junior Member
Joined: Jan 2013
Posts: 30
Likes: 0
From: SW Ontario, Canada
2010 S550 2011 E350 2000 CLK320 convertible 2004 SL500
chris, excuse my idiocy, but what/where is the K40/2 module? also, can I go an even simpler route and pull an acc 12v from my cigarette lighter?? 
MBWorld Fanatic!
Joined: May 2009
Posts: 1,187
Likes: 239
From: Santa Clara, Ca
2003 SL55 / 2002 SLK32
The K40/2 is in the small compartment just inboard of your driver's side hood hinge (between your ECU and the brake master cylinder).
My first thought was to suggest that the cigarette lighter might be a simple solution ... however, I seem to recall (at least on a 2003 SL55) that the cigarette lighter gets its power cut when you have a "consumers offline" situation (consumer/trunk battery is low ... which happens when the car sits for as little as 4 days unused). I can't imagine you'd want to be without your radio under those circumstances ... and I DON'T think the "circuit 15r" line gets similarly disabled.
Cheers,
Chris
oops, forgot the ... what is the k40/2 ? question
it is the Driver-side fuse and relay module (SAM)
Last edited by latemodel21; Sep 17, 2015 at 04:07 PM.
