try this..
Check that the pipe connecting to the rear screenwash nozzle(within tailgate) has not become partially disconnected,if it has then screenwash runs down into a microswitch on the tailgate lock(common problem).This causes the alarm to go off intermittently.
Golf iv estate suffers a similar problem but is caused by the top washer connector becoming detached this then leaks onto the lock and triggers false alarms
Mick, November 2010
