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VW Wiring (1998 And Later Models)
The radios in VW cars (1998 model and onwards) use an amplified aerial for improved radio reception. This amplifier is built into the base of the aerial and is powered by a feed from the stereo. This power feed is sent down the center of the aerial cable.
Therefore, if the factory-fitted stereo is replaced with an aftermarket unit, the aerial will no longer get this power feed and the amplifier in the aerial will not be turned on. This will result in poor radio reception.
To solve this problem you will need a VW aerial adapter. This takes the electric aerial output of an aftermarket stereo and combines it with the aerial socket to supply power to the amplifier in the aerial.
The other difference that post 1998 Volkwagen car radios have is their power connection. . .
Stereos require 2 power feeds. One is a constant feed that is always live whether you have the key in the ignition or not (this keeps the memory settings, clock etc). The other is a switched live which gets a feed when the ignition key is turned.
Although VW car radios use an ISO connection block for their stereo wiring (the same as all aftermarket stereos) you cannot simply plug it straight in. On later Volkswagen car radios, the pin configuration of these two power wires is reversed. If you plug it straight in, the stereo will work fine. However, it will lose all of it's memory settings once you switch it off.
To solve this problem, you will need a VW wiring adaptor. This will plug into your VW wiring harness at one end and the aftermarket stereo at the other end. In between these two points, the adaptor swaps over the location of the two power wires. This takes care of the problem.
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