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jag-lovers.org has some info that states drill a hole 4.5 inches up from base and the mechanism to open will be in that vicinity. Afterwards, install a rubber grommet to seal hole. This is under the license plate so it will not be visible. Go to "photo album" to page 181 to 192. This is for 1984 XJS might all be about same area. Hope this helps.
1994 Jaguar XJS turns over but no spark. Saw some smoke at ignition coil and replaced it. black wire that leads from coil toward the front of engine was cut and repaired it