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If the VW tech suspects the ECM relay it's for a reason. People in cold climes frequently run into a situation where a relay will contract in cold temps, completing a circuit. This is seen as a "stuck" horn, for instance. The reverse must also be true-- a relay exposed to heat would have its contacts expand to the point where it couldn't work until it cooled. Also, you may have more than one identical relay controlling different functions, if so a defective one can easily be found by swapping . I don't know jack about VW's but this may help.
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