I installed my OEM kit this weekend and have the same problem. I can't get it to switch to aux mode. I am making sure to have my phone plugged into it providing a signal. I double checked that I have the right kit and my car is 11/02 production. I haven't had any more time to troubleshoot it yet. Any suggestions?

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2003 3.0 5MT Topasblau
Purchased in 2016 and sold in 2024
2012 35d Platingrau