Check for power at the left and right tail lamp fuses in the fueblock. If there is no power check the TNS fuse. If there is power there than you can try swapping the TNS relay with another relay in the fuseblock that is the same. If there is still no power after swapping the TNS relay you need to check the light switch.
You need to check the green wire on pin two on the back of the light switch to see if there is power there. If there is power than the light switch is probably bad.
You could also check the light switch operation with the TNS relay removed. Two of the pins in the fuse block should have power to them. One should be grounded all the time (the one that feeds power to the fuses) and one should be grounded only when the light switch is on.
Since the instrument cluster illumination gets its power from the right taillight fuse it has to be one of the above.
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