make sure no water is geeting in around car aereal on roof dry it out with hair dryer in side car.put bead of silicone around airel on roof.if this does not work replace pump relay under car bonet right hand side first one nearist you brown in colour;
before buying new pump ; test it is geting power
paul, December 2009
Without info on year & exact model, it's difficult to point you in the right direction, it could be anything from fuses, relays, wiring or even the ECU/Immobiliser