I just started to take the car interior apart and am a little confused about the wiring for the stereo system. I want to install a sub in the trunk and want to wire it in.
Does anyone happen to have a wiring diagram for this model?

Thank you so much guys.

I'm assuming you just want to wire a sub into the stock stereo.. (?) I have no idea how to wire a sub in unless you have some kind of rca outputs. I'm sure there's a way to take the speaker wires and convert them to a low-powered signal (w/ rca cables), and then run the signals back to an amp with an integrated crossover (to cut out the high frequencies). I have only wired a sub into a head unit that has a specified subwoofer channel, though.

Sorry I couldn't help! Good luck.

Thank you for your help. I was looking for the wires that come from the speakers in the front doors as they have the low frequency sounds. However, I did not see which cables they were at the headunit, so I took some pictures for reference and when I get a better idea what each one is, I will attempt the installation again.

go to

http://www.autolib.diakom.ru:8001/CAR/Mercedes-Benz/1992/300E/SYSTEM%20WIRING%20DIAGRAMS/

This is a Russian site so you may need to use Google Language Translator

Ok... here goes.

The headunit has two pairs of outputs... LEFT and RIGHT

They run to a fader switch in the console, where they split to front and rear l/r.

If there is an amp, they run to behind the rear seatback, where there will be two small amps one on each side of the seat. The amplified speaker outputs leave there down the wiring channels. It splits again, and one pair goes into the door, and one goes up to the dash.

The wire you are looking for isnt at the head unit. Secondly you want to tap it between the amp and the head unit, past the fader, and use the rear outputs. Then you need a loc (line output converter), to convert the speaker level signal to RCA's (line level). You also need to run a remote turn on lead from the head to the trunk. Then once you have your RCA and remote turn on leads in the trunk, you need a proper crossover for the subwoofer.

Hope this makes sense.

George

__________________
George Androulakis

Former Mb's:

1990 500sl R129 - 76k Original Miles - New project - Follow the saga http://90r129.blogspot.com/
1990 190E 2.6 148k mi (sold)
1989 420 SEL 246k mi (sold)
1995 C220 175k mi (sold)
1992 190e 2.6 74k original miles (sold)
2000 c230 Kompressor 122k miles (RIP)
1996 C220 149k mi (sold)
2000 C230 Kompressor Sport 127k (sold)

Current Cars:

2009 Mercedes c300 4matic
2006 Mercedes s430
2005 Jaguar XJR
2003 Cadillac Escalade

Thanks a lot for the help. Now I know what to do and next weekend I will attempt the project again.