Telematics Control Unit (in roof)--battery replacement - BMW 3-Series and 4- Series Forum (F30 / F32) | F30POST
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DIY Battery Replacement - BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
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