Subwoofer Install Question


(from this thread https://mbworld.org/forums/c-class-w...rt-number.html)
Last edited by VVF; Jul 24, 2014 at 06:25 PM.
350Wagon, do you still need me to try to get a photo of mine, or do you have an orange one in your car (like VVF's photo) that you can inspect?


Thank you for all your help to btw. I will post part # for anyone that may need it.
350Wagon, do you still need me to try to get a photo of mine, or do you have an orange one in your car (like VVF's photo) that you can inspect?
My local dealership could not find it in their catalogs when I asked last year. VVF posted a link to what seems to be the only site online that has one. I'm surprised these aren't easier to find.


The Best of Mercedes & AMG
What wire harness do i use?
However our cars don't use 12V switched to turn on the stock head unit ... I believe it's a CAN-bus "ignition on" signal that allows the radio to turn on. Therefore the wire that your adapter harness thinks should be 12V switched, is actually a dead wire on the car side. (There might not even be a wire going into that pin).
So ... you will need to tap into another source of 12v switched.
The most common and technically simplest way of getting 12V switched is through the cigarette lighter, which is just below the radio in the ashtray, and has three wires going in. Find the wire that is 12V switched and tap into it for turning on your radio. Incidentally, if your radio has an illumination wire for day/night, you will find that one of the three wires to the cig lighter turns on the glow ring around the lighter at night with a 12v signal ... you can use that as well if you want.
A more elegant and costly solution is to buy one of those CAN-bus interpreter boxes that hooks up to your wiring harness at ground, 12V fixed, CAN-low and CAN-high. This box may generate things like ignition status, reverse gear, and speed pulse, all by using 12v signals on different wires. It's pretty cool how much in these cars is computerized with digital busses.
Last edited by jkowtko; Aug 6, 2014 at 04:32 PM.





