What type of sound (click click click) is it? Is it an electronic type of click...or is it a mechanical type of click...or is it a physical type of click?

If physical, then as car girl mentions, check all of the tools & stuff around the spare and the spare itself to make sure all are secure and not moving around making noises as you drive over bumps.

If mechanical or electrical...the suggestion to have someone ride in the back (remove the cargo floor if possible) and have them try to pinpoint where the sound is coming from.

If you don't have the SLS rear suspension, it could be mechanical noises from shocks/struts & their mounting system...the e30 3 series was notorious for the rear strut mounts ripping and you'd get a clicking sound as the strut pushed upwards when driving over bumps...or perhaps something in the rear suspension or the rear hub or brakes is making a clicking noise that is reverberating into the cabin.

There are multiple control modules located around the spare, perhaps one of them is making an electrical clicking noise...again, having someone ride in back with the cargo floor removed might help pinpoint where the noise is coming from.

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