Hi Borys,
If all is fine with J519 (09 - Central Electronics) there maybe a fault with the wiper motor control unit J400 or wiring in between. J400 is a slave from J519 and controlled via LIN. The physical wiring between J519 and J400 is from plug C (that's the 32pin connector)
J400 is one complete unit with the wiper motor. Have you replaced this in the past?
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Matt
2004 A8 3.7q, 1998 A4 2.8q, 1994 Coupe 2.8q SORN,
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