There is alot here, just search 'w203 aftermarket head unit' or 'w203 10 way iso' or 'w203 srs light whilst installing aftermarket head unit', I used info from threads started by 'omega1' + 'cplnoonoo', so possibly do a username search aswell. If it is low you will get those errors on the dash. Oh and make sure your battery is charged up. The only time i had weird errors like that pop up was when i disconnected something that wasn't related to my radio lol.Īll brown wires are grounds on Mercs FYI, weird as hell.īut if they removed the factory amp and radio why do you still have fiber? The fiber should only control(radio, factory amp, nav) Probably not necessary, since the power antenna comes on when the car is started i believe.or it may not which could explain my radio stations not being strong. I then used the Rem wire from my radio to power the Rem on the amp. Which i assume was the wire coming from that noise isolator. Still need a constant from the somewhere though. You could use the cig lighter for all 3 to run the radio i guess.(acc, grnd, dim). I think i used the ground from the cig lighter but that was it. Like i said i ran all of my wires from where the factory amp was in the trunk. It only had some fiber and a small 3 prong wire going to it. I didn't have any wires from the factory HU. Hmmm if the factory amp was in the rear the wires should still be back there. I can only assume it does tho as the previous installer
I'm starting to think that the ESP, ABS, and SRS notifications on the info screen in the dash have nothing to do with the Fiber optic issue. I know I can find power somewhere but why am i not getting power from factory wires? Also I don't remember what wires it was connected to but i tried ground and 12V and nothing. I had no idea what it was but after removing it, I can no longer get power to the HU. There is a pic I took a few posts back of something that looked like a noise filter installed with the old aftermarket HU. The 12V constant reads 24mV.I get 12 ACC from tapping into the cig lighter and apparently the brown wire is my ground. My whole prob started by the factory wires at the dash not working properly. Only wires to the taillights and FO lines. There is no wires from the speakers there. Why didn't you use the wires in the dash for your HU? The factory amp was in the rear wheel well in my car. Was gonna wait to post my build, but Ill post what i have in here for you.Īll the audio components have already been removed before i bought this car.
And there is also a antenna adapter cable you have to buy(fakra to Motorola)Īfter installing everything i was getting weird static and ran the noise isolator to my radio +pos not acc and it went away. the factory amp has the speaker wires already there so connected them to a new amp. Removed the stock radio ran all my wires to the radio(pos, acc, ground) from where the factory amp is to the HU. So if you want to use the stock amp and nav you have to buy that fiber cable connector. Basically you need to remove the factory radio and amp, cd changer and navigation.Ĭouldnt remove my cd changer since its behind the ac controls but it no longer is usefull, a few people wired it to where it would still hold cds as storage, but who uses cd's these days.
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