NHTSA Complaint #11609269 — 2004 MAZDA MAZDA3

This model car has a fuse box under the glove box known as a "passenger junction box" that has a faulty or defective relay soldered onto the circuit board. The relay is tied to lighting that includes the interior lights, exterior front parking lights, exterior rear tail lights, and the license plate light and is controlled by the left turn signal stalk (rotating switch). Based on my experience and many others (on the Mazda 3 forums), this relay has the tendency to fail and cause all of these lights tied to this relay to intermittently or permanently be disabled. There is no warning for this; the driver will only notice when driving at night that the interior illumination of the dashboard goes completely dark, which could cause disorientation and confusion as to whether or not the car is operable. Subsequently, the problem can be recreated by attempting to turn the lights on and off and there will be no response (and no clicking noise...it is audible when working and it switches on); the relay fails to operate and all the lights will not turn on. Driving at night without tail lights is extremely dangerous and I am surprised this has not caused serious injury from rear-ending incidents in nighttime or inclement weather situations. The serial/model number of junction box on my vehicle is BN8B-66730-C and many others on the forums have had the same issue with the same model, as well as other variations of the box. Some on the forums went as far as replacing the culprit relay (see attachment); however, at the risk of destroying the entire junction box and rendering the vehicle unusable. I finally ended up purchasing a replacement unit on eBay which corrected the issue so far and has made the lights reliable again.