If there is no legend on the relay cluster cover makes it very hard to locate
J271 varies from model to model, but once you have the relay out, check one of its sides for the diagram of the pin outs. The solenoid 12V supply will always be marked as 85, the negative always as 86, the normally open (N/O) contact as 87, the normally closed (N/C) as 87a and the pin marked 30 is always the switching voltage supply. Notice that terminals of 87 and 30 are always larger than the other terminals. Connect the relay solenoid to a battery with clip leads and measure the voltage at 87 and 87a, and that it changes over when you hear the relay click. Alternatively do a continuity test between pin 30 and 87, then again between 30 and 87a. Then connect power to the solenoid and the continuity measurement should switch over to the other pin. Unlike the image above, there may be even be more than 1 double pole double throw switch contacts on the relay depending on the model of your car. The Audi J271 is different to some VW's and has more terminals.
just look at the way VW put relay clusters into a passat ..what a mess
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