Sony Head Unit Wiring

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=67286
Printed Date: July 18, 2025 at 8:21 PM

Topic: Sony Head Unit Wiring

Posted By: blackark
Subject: Sony Head Unit Wiring
Date Posted: November 29, 2005 at 8:30 PM

I have a Sony MEX 5DI head unit I recieved sometime ago and have a slight problem. I hooked up all the wires to the best of my knowledge (bought it off Ebay some time ago with no instructions) and It works fine but retains no memory when the vehicle is turn off. The wires are color-coded like so:

Yellow = Vehicles 12v power for radio

Red= Constant 12v (memory?)

Black= Ground

Med Blue=Remote

Dk Blue= Power Antenna

Orange= Dimmer

Lt Blue= I have no idea.

Am I hooking up something wrong? My friends Sony deck does the same thing and has similar wires, it's a complete pain we have not experienced when installing other brands actually. Any help would be appreciated.

Replies:

Posted By: ss-installer
Date Posted: November 29, 2005 at 9:14 PM

red goes to a switched power, not constant.

yellow goes to constrant.

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Posted By: auex
Date Posted: November 29, 2005 at 10:32 PM

ss-installer wrote:

red goes to a switched power, not constant.

yellow goes to constrant.

Exactly, you have your memory and switched/acc/turn on backwards.

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Posted By: blackark
Date Posted: December 01, 2005 at 5:41 PM

Thanks fellas, going to go try it out now.