Q: Rear tail lights stopped working on 1990 Toyota Camry

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the tailights stopped working on my son's 1989 Toyota Camry. I checked the fuse which is fine. Bulbs are new. No voltage is going to the tail lights even though the fuse is good. I replaced the tail light relay which i think is the left most relay above the fuse plate on driver's left kick panel. Continuity of wires from fuse block to tail lights is good. Any other ideas or help would be great.
(1) Answer
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There is a taillight relay and also a taillight failure sensor relay that can cause the rear taillights to not work. I would try to get a wiring diagram and a test light and diagnose the problem.
Getting frustrated as I can't find the tail light sensor. I see it in the schematics, found the wiring, but can't locate a sensor or sensor relay. It doesn't appear in the schematics that it is a sensor relay, rather just a sensor.
Found the Tail light sensor circuit board inside the trunk on the left wheel well next to the power antenna. It was fried.
Thanks lawrenceg!