Toyota Repair: Camry tail lights, resistance values, light bulbs

Question
My '92 Camry sedan has the common dead tail lights problem.  I understand that the culprit is likely the Light Failure Sensor.  I have also read to check the wiring near the left trunk hinge since it takes a lot of flexing.  Question: Is a fried Light Failure Sensor always/usually associated with a short somewhere or does it often blow on its own?  In other words, if I fix the Light Failure Sensor how likely is it that it will stay fixed?

Thanks,

Steve

Answer
If the wiring in the harness is ok and not shorted out and has been properly repaired and there is still a tail light problem replacing the tail light failure warning relay will repair any other remaining problem. And yes, the relay will fail on it's own, I would also recommend replacing "all" of the tail light bulbs when repairing or replacing any part of the tail light circuit, even though the bulbs are working the warning light may come on, this warning system is based on resistance values of each bulb and it's circuit, the relay compares resistances between each bulb and if there is a significant difference in resistance the light will turn on, this can be caused by using different brands of bulbs or bulbs that have developed more resistance but still light up, I suggest getting all the bulbs from the toyota dealer or at least from the same supplier, and also checking the bulb sockets for poor contacts and making sure that all the ground wire connections(white/black tracer) are tight. Don't forget to check the center brake light bulb and replace it.