no sound from aftermarket 2003 avalanche

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=73916
Printed Date: May 16, 2025 at 12:36 AM

Topic: no sound from aftermarket 2003 avalanche

Posted By: renzam69
Subject: no sound from aftermarket 2003 avalanche
Date Posted: March 04, 2006 at 5:13 PM

When i tried to install an aftermarket radio in my 2003 Avalanche, everything works except the speakers. i checked it with two radios and two different wiring harness. does anyone out there have any ideas what it could be. i also tried to wire it directly but i cant find a wiring diagram for my radio.

Replies:

Posted By: KarTuneMan
Date Posted: March 04, 2006 at 6:05 PM

Radio 12v	orange	+	radio harness
Radio Ground	BLACK/ white	-	radio harness
Radio Ignition	Class 2 Serial Data
Radio Illumination	N/A
Factory Amp Turn-on	pink	+	radio harness
Power Antenna	dk. green	+	radio harness
LF Speaker +/-	tan - gray	+,-	radio harness
RF Speaker +/-	lt. green - green	+,-	radio harness
LR Speaker +/-	brown - yellow	+,-	radio harness
RR Speaker +/-	blue - lt. blue	+,-	radio harness

Ya see that line that says Radio Ignition.....that could be your problem. OR factory amp turn on....

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Posted By: ss-installer
Date Posted: March 04, 2006 at 6:58 PM

did you use an interface module?

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Posted By: renzam69
Date Posted: March 05, 2006 at 12:27 PM

what is the interface module?

Posted By: stang351w
Date Posted: March 05, 2006 at 1:25 PM

well..without the inferface module you will lose certain things amongst the vehicle...i'm not sure excatly what in that specific vehicle... i also thought those vehicles had an external amp (someone correct me if i'm wrong) but either way, did you connect the blue wire on the back of your deck to anything? what that wire does it sends a power signal to your amp(s) and tells it to turn on, if the factory or aftermarket amp doesn't see that signal then you get no power to the amps and no sound.

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Tri County KustomZ
certified installer