BMW M3 BT Passkey Help

i recently got a 2004 bmw m3 with bluetooth no i drive. and the past owner lost the card with the bt passkey i found out that the pass key is also on the bluetooth ulc or tcu in the trunk i would like to know
how i can get to it cos when i look in the left of the trunk i only see the gps and cd changer please help thank u
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