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Old 01-21-2004, 08:53 PM
Registered User
Join Date: Jan 2004
Posts: 3
Question E320 new radio no sound

Hello I am new to the board. Very cool there are so many Mercedes knowledgeable people here. I am hoping someone can help.

I have a 99 E320 that I took the stock radio out and replaced it with a pioneer deh-7400mp, cd/mp3 player.

The stock system was a radio/cassete player with a BOSE sound system. No NAV or anything else.

I pulled the radio, got a adapter wiring harness and plugged it in.
The radio seems to work perfectly except I do not get any sound.

The wires on the harness and the radio that correspond to the speakers are connected (grey to grey,black-gray to black grey etc)

I noticed there was a fiber-optic cable connection in the back of the stock radio, I thought that might be used for steering wheel controls, even though my steering wheel has no controls.

My question is how can I get sound out of the radio? Where does the fiber connector go to? Is the fiber connecter used to go to the speakers?

Any suggestions for a newbee.
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Old 01-22-2004, 01:11 AM
La Jolla Audio
Join Date: Dec 2001
Location: San Diego California
Posts: 996
There a couple of possible problems. #1 the amplifier turn on wire needs to be hooked up. #2 it is hooked up but to the wrong terminal. Check out how you have them hooked up and let me know.

The Mercedes Specialists Since 1986
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Old 01-22-2004, 04:42 PM
Registered User
Join Date: Jan 2004
Posts: 3
I'll be hornswoggled. The harness docs labeled the blue wire as AMP remote, so I ignored it.

After your reply I tied that to accessory 12v and walla! Sound!

Very cool thanks so much for the reply.

Man the system sounds so good now, I didnt know the stock speakers could sound so well. Just shows how weak the OEM head unit is.

thanks much
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