WARNING: This page is about a different car, the 2023 BMW X5, 2022 BMW X5, 2021 BMW X5, 2020 BMW X5, and 2019 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.
Release wiring harness (2) from holders (1).
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Unlock and disconnect the plug connections (1) and (2).