’97 Audi A4 Gamma stereo replace

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=81920
Printed Date: May 21, 2024 at 5:55 AM

Topic: ’97 Audi A4 Gamma stereo replace

Posted By: mmh1
Subject: ’97 Audi A4 Gamma stereo replace
Date Posted: August 22, 2006 at 1:15 PM

Hi,

I'm trying to replace the standard factory fit Audi GAMMA cassette stereo in my Audi A4 1997 with a new Sony head unit.

I took the GAMMA head unit out and found the ISO style plugs for the speakers and power.

1. The power ISO plug works OK except for the radio loses it's memory when the ignition is switched off.

2. My second problem is that the speaker ISO only has 4 wires when pluged into the Sony HU these seem to operate the front speakers L + R. Could someone help me to identify the rear speaker wires on the harness.

The GAMMA stereo also had three other plugs yellow, blue and green. As far as I can make out the blue is for the changer control.

Any help would be greatly appreciated, thanks,
Mo

Replies:

Posted By: mmh1
Date Posted: August 27, 2006 at 9:57 AM

Anyone have a wiring diagram or colour codes for the stereo wiring on a 1996-1999 Audi A4?

Posted By: geepherder
Date Posted: August 27, 2006 at 5:51 PM

Check on www.installdr.com, otherwise read the sticky "How to figure out stereo wiring."

-------------
My ex once told me I have a perfect face for radio.

Posted By: the_swede
Date Posted: October 27, 2006 at 9:55 PM

Hi there!

You should switch the red and the yellow cables that are in loom that came with

your Hu. Most european car manufacturers that uses the so called ISO connector

have reversed ignition logic, which means that the red and the yellow cable are

switched with eachother in the connector inside the car. Altough the connector is ment to be standard

its only the connector fysically that are standard in the meaning that you can only plug it in one way.

There is no standard in the pin configuration.

About your other question.

Either you dont have any rear speakers, or otherwise they are active.

If they are active there is either Bose or Nokia.

Then you use the mini iso (the yellow 6-pin called C1 in the figure below

or a red 20-pin or a black 20-pin)

posted_image

See the figure to make it easier to understand (the back of your Gamma headunit).

In the yellow connector:

Pin 1: Line out left rear

Pin 2: Line out right rear

Pin 3: Line out ground (common for all 4 channels)

Pin 4: Line out left front

Pin 5: Line out right front

Pin 6: Remote (common for all 4 individual speaker amps, not always used, sometimes

you use A3, equals pin 3 in the black 8-pin connector)

There should be a sticker on the Gamma headunit that explains all this to you.

In Sweden we use an adapter for about 53 usd that makes it so easier to install.

And also when we buy a new Hu its always end with a female ISO.

You could use this one:

posted_image

This is Autoleads PC 9401 that fits several Audis.

There can be several to choose from depending on several things for example the voltage on the line out.

See https://www.autoleads.co.uk/installation_db.html for more info.

And if you dont want to cut any cables in your car you can look for an PC 3433 from the same

manufacturer. It will fit your Sony in one end and it has a female ISO in the other!

posted_image

We have done that ourselves when our customers has bought a Sony from the U.S.

Or you can just buy a Hu from Blaupunkt, they use mini iso.

Good luck!

Posted By: mmh1
Date Posted: October 28, 2006 at 6:58 AM

Thank you very much for your help, I had almost given up on it.

I will try out you advice and let you know the result. The diagrams are a great help and I should be able to sort it out now.

Thanks,
M :)