2000 S-Type 3.0. I know... check the fuses and relays... done. Still no power going to the center wire of the DCCV. I have read several treads, but there does not appear to be anyone that has covered other possibilities.

 

Well it most likely means you have a blown CCM. Look at getting it repaired rather than replaced. Have a look at this guy's stuff. Please DON'T let the bad DCCV linger! The longer the DCCV is bad the more chance it will take out the module.

- JaguarClimateControl.com
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I think you'll find the centre wire is the power in and does not come from the CCM. It should be live and if it isn't then you have a straightforward problem, just grab the electrical guide and work through where the power should be. Failed fuse, relay, connector or wire.