Open sunroof and look for drain hole. Since it is pass. side, probqbly rear on that side. Use flashlight and mirror to look and see if plugged at top. Usually drain out right rear tire wheel. If drain hole to front look for tube out right front or door pillar. Not sure of 96 but most XJs were like this with sunroofs.
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Larry K
ASE Certified
58 Jag MK 1 (under SLOW restoration, since 99)(33 yrs.)
96 Discovery 4.0 series 1 (10 yrs)
03 MINI Cooper S (modified for SCCA competition)(6 yrs)
07 Ford F150 4X4