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BMW Z4 E89 Roadster Comfort Module. Before installation: Please read these instructions carefully and take your time with the installation. Performing the. The retractable hardtop consists of two aluminum roof panels. The electrical system of the E89 - Z4 Roadster is based on the BMW 1 Series and 3. Series. Repair: Check the live data with your Opus IVS device and make sure the readings are changing when the roof is being operated or moved manually.