Problems with the central locking system (diversity module) in BMW – how to fix them?

BMW driver question

I bought a BMW 7 a few days ago with a non-functioning central locking system. I went to an electrician where I was told that the Diversity antenna was to blame. I purchased a new antenna and had it replaced in the rear pillar on the passenger side. According to the electrician’s assurances, the problem lies with the receiver, as the remote control is operational. Perhaps it is a Diversity scrambling issue? Please advise.

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