I never have, but this is one of the reasons that I have it mounted under the CD changer in the back, so I can take it out very easily. As I understand it, warranty coverage cannot be denied unless it can be proven that the aftermarket part (in this case the S1), is causing the problem. ie: a bad power seat motor did not go bad because of an S1 installation. I would imagine, however, that any defect connected to the I-Bus, could be a problem if an S1 was present.