One problem related to wiring has been reported for the 2004 Mazda MAZDA3. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Mazda MAZDA3 based on all problems reported for the 2004 MAZDA3.
While driving on the freeway at 65 mph at night, my lower dash (radio, hvac) and steering wheel controls lighting went out for about ten minutes, and then came back on. This started happening intermittently from that point on, shutting off and coming back on randomly, with the lights being out continuously once for about 30 minutes while driving at night in traffic. The safety concern is that I just discovered the tail lights were also going out at the same time. Indications are that the cause is a defective passenger junction box (pjb). This is a serious safety issue and an unacceptable engineering flaw which appears to affect other drivers of this vehicle model as well. Due to prohibitive cost of jsb replacement and uncertainty of the integrity of that part itself, it may be necessary to install a failsafe independent wiring solution for the brake lights to ensure required reliability.