When the headlights are on this TNS control wire is connected to ground which activates the TNS relay and powers 3 circuits right taillight, left taillight and illumination (gauge cluster). It enters the PJB through a large connector on the top side, left. On my car, there is a small black wire with white stripe (B/W) running from the headlight switch to the PJB. TNS stands for taillight/number/side and provides power to the taillights ( & license plate) as well the gauge cluster. The relay inside the PJB is called the TNS relay. The replacement functioned but had the same problem, so I sent it back. I attempted to fix it by ordering a matching PJB from ebay. The car was owned by her friend, who kept something in the car to bang on the passenger side junction box (PJB) when the taillights didn't come on. ![]() I've just addressed this issue with an '04 Mazda3, 2.3L I bought for my daughter to drive to college. TLDR: replaced my BN8B 66730 C JB with model BN8B 66730 F and my tail lights are finally working again. Again, I never had nor used the remote unlock and lock feature, so if you do have that feature, take caution. Vehicle drove fine, no transmission issues, no ignition reprogramming. radio, power windows, all headlights, fog lights, and FINALLY my TAIL LIGHTS!!!!. Deleted trouble code and everything worked. Got a trouble that states that the vehicle lost connection to JB. Like I mentioned above, the only difference was the extra pin. I disconnected all the connects and compared both. I hit the Jb and my tail lights began to work. I recheck my JB, and sure it enough, it did it again. This model had 1 extra pin, which I figured was for the adjustable headlight controls, although the 05 did not have that feature, I take it, it was a lot faster and cheaper to use the same junction box for the later models as the pin would simply just be there not connected to anything. The part number for both the 04 and 05 was BN8B 66730 F. I went to the junkyard and found both, a 2004 and a 2005, both were the same trim as what I described above with the exception of the 04 Mazda, which had adjustable headlights. The part number for my junction box (JB) was BN8B 66730 C. ![]() I had issues with the taillights going out, like people are describing here. I have a 04 Mazda 3 hatchback 2.3, A/T, Fog lights, no sunroof, manual seats, power windows and power side view mirrors, NON adjustable headlights * for the life of my vehicle, I never used the key fob remote as I never received one from the dealership, so I don't know if what I mention below will work for those of you that have that remote unlock/lock feature.*. You can check our my Mazda3 3 by my Instagram, ugotmail56. this worked for me and IT FIXED MY PROPLEM. Click to expand.So to finally address this issue.
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