vw mk4 stereo pinout diagram

Printed From: the12volt.com
Forum Name: Vehicle Wiring Information & File Requests
Forum Discription: Request Car Alarm, Car Stereo, Cruise Control, Remote Starter, Navigation, Mobile Video, and Other Vehicle Specific Wiring Info, Manuals, Tech Tips
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=123159
Printed Date: July 12, 2025 at 5:43 PM

Topic: vw mk4 stereo pinout diagram

Posted By: w0j0
Subject: vw mk4 stereo pinout diagram
Date Posted: August 18, 2010 at 1:23 PM

hi all! I am requesting a wiring diagram, or more specifically; a pinout for the factory radio in a 1999.5 VW Golf mk4. Most likely it will be the same as a 2000+. The pinout that will prove to be most useful is one that contains information regarding the cd changer, as well as line ins and outs. I thank you in advance for your help!

Replies:

Posted By: w0j0
Date Posted: August 18, 2010 at 1:28 PM

Additional information: The factory radio is a single DIN, NON-premium head unit. In other words; there is no external amplifier. Hope this helps. Thanks again

Posted By: 91stt
Date Posted: August 18, 2010 at 1:48 PM

The unamplified radios are the same for 1999 and 2000
1999 VW Golf radio diagram

-------------
This information is provided only as a reference.
All circuits should be verified with a digital multi-meter prior to making any connections.

Posted By: i am an idiot
Date Posted: August 18, 2010 at 2:22 PM

Are you trying to build your own Auxillary input? Or what are you trying to do?

Posted By: w0j0
Date Posted: August 19, 2010 at 11:14 PM

Thank you for the prompt response and useful info! My goal is two-fold: (1) to build an aux input while still maintaining CD changer functionality and (2) to provide a line level feed to a subwoofer amplifier. It does not appear as though there is a line out available on the head unit, so I will most likely be using a resistor network to scale the output down to a usable level (my amp does not have hi power ins). I would appreciate any suggestions from those that have already ventured down this road. Thanks!

-------------
"Those willing to trade Liberty for Security deserve neither" -Ben Franklin