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Third (center) brake light not working

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Third (center) brake light not working on my -08 525 XDAT. Changed all the wiring running through the hinges of the rear hatch last year, replaced with soft silicone cables. The LED lamp itself is tested ok, and the noise supressor Z13 is replaced OK. There is 12v coming out of the supressor when brake pedal pushed. Everything else working fine. Suspect a wiring fault between the supressor and the brake light following me changing the cable bundles last year. Trying to isolate the fault without reopening a can of worms (was a cumbersome job changing those cables).

Does anyone have a guide to dropping the roof liner in the rear?

Does anyone have a good wiring diagram for the third brake light?

Which fuse protects the center brake light?


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