One problem related to rear window defogger has been reported for the 2005 Mazda MPV. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Mazda MPV based on all problems reported for the 2005 MPV.
Driving 5 mph on road, rear defroster on, rear window shatters for no apparent reason. Contacted the dealer, dealer said would contact headquarters to get approval to replace glass. Did replace glass. First thing they mentioned asked when they heard the rear window shattered was if the defroster had been on. Suspicious that this has happened before and worried this may happen again.