To test this problem without a voltmeter: 1. Temporarily place a 1K-ohm resistor between pins 4 and 7 of the DLC and ensure it is making contact with both pins (Figure B. If the resistor gets hot, your K-Line is shorted to B. If it does not get hot, you do not have a problem. Do NOT install this resistor in the port. You are simply using it to check and see if the K-Line has V. If the resistor gets hot, then pull it out and fix the problem by disconnecting the K-Line from the stereo wiring harness. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1 2 3 4 5
156 The Aftermarket Radio Problem z To repair the problem: 1. Remove the radio. 2. Make sure that the K-Line in the radio wiring harness (black pin multi-connector III-T8) has been removed from the connector and taped back to the harness (Figure B-2). Figure B K-Line on the radio wiring harness black pin multi-connector III-T8 NOTE: i Some 2002 and newer Volkswagens come with the double-DIN Premium VI radio. This radio does not have a K-Line connection, but rather has a CAN-high and CAN-low. Although the connector is completely different and it should not be possible to have the Aftermarket Radio Problem with these newer cars, if you use an aftermarket radio, it would be best to make sure that nothing is connected to these pins in the radio harness. The back of the Premium VI radio is shown in Figure B-3.