My A4 headlite washers run off the same pump as the windshield washers. It is activated by pulling and holding the windshield washer activator switch and after a few seconds, the system builds up sufficeint pressure that the headlite washers then kick in as well. If yours operates the same way, you may want to verify there are no leaks or holes in the lines that feed the headlite washers.
Hope this helps.
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