Subs and Radar hardwiring
P.S. I dont think Benz would screw us over like that... but Iv been wrong before... alot =)
-Mike
So, Vinnie said the car was all fiber, did he? I have been told that the W204 has switched from a CAN bus network to LAN bus but that's wire, far as I know. I am going to look at the input to the rear SAM (behind the right side trap door in the trunk) and see if I can see any fiber screwed to the back of the board.
In the meantime, finding switched 12V for a radar detector is no small matter in the 204 because everything is so well concealed. First, forget about finding it over the inside mirror.
I intended to connect to the back of the 12V power outlet in the glove box and after removing the right side kick panel (after pulling back the door welting) and removing the panel above the passenger foot space (requires a 20X4 Torx wrench) I found that the power plug is NOT switched so I put it all back together and patch up the cuts on my hands.
The next closest 12V source is indeed the cigarette lighter but I'm not going to try again until I find out the color code of the 12V lead to it because it probably feeds forward to the big transverse wire run across the lower firewall inside which I saw when I had it apart previously. And then left to the underhood fuse panel.
You need to find a more professional shop, I think.
The W204 and W203 do use all fiber optic wiring.
I learned this the hard way as I had to rip out all of the wires in my W203 in order to put in TV's and a sub.
Same deal in the new C350.
Part of why i paid for the upgraded stereo and MM system in my new merc was the huge pain that the fiber optic wires caused me before.
With your radar I suggest going with a battery powered version so you don't need the dangling cord.
Learn from my mistakes and don't try to take out the fiber optics.
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This is a false statement.
To prove it to yourself, just open the rear fuse panel access cover and observe first, nine brown ground wires attached to a ground stud. Then look at all of the wiring to the rear light hanging in space as it goes to the taillight plug. All wire, all copper.
Fiber is used for data or light transmission, not voltage. Glass, being a non-conductor obviously passes no voltage to electrical components. It is possible that the LAN is fiber, connecting the front and rear SAMs but all the electrical components need 12V and ground which BTW is always brown in German cars since time immemorial.
If you think I might have a tiny bit of experience in data transmission by fiber, you could be right. Think AT&T.
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Add to that, the factory amps are usually tuned to the speakers and don't have enough punch for an aftermarket sub.
I guess we will have to wait for the market to catch up and release fiber optics amps. There are alternatives such as electronic convertors for the CANBUS but it's not cheap.
the MOST fiber bus is used for multimedia only, carrying audio and control between the radio, amp, cd, SAT. CAN is used to connect all of the major control modules in the vehicle allowing the normal hundreds of wires to be replaced with just 2. LIN is a single wire serial bus used for low speed interconnect between main modules and things like switches. there are interfaces for all of these networks with varying pricing and availability.
you can connect an aftermaket sub using a line output convertor hooked in at the factory sub leads. you will probably need additional equalization to clean up the signal which is adjusted for the factory sub. otherwise you end up getting nothing below 40-50 hz . something like the JL audio cleansweep works well.
Go through the W203 threads on sub installs and do what we had to do. No difference.
Multimedia package, or not?
When I inquired about improving the Bose setup in my W203 four years ago, the shop said they couldn't do much.



