I don't think there is one. Power for the radio comes out of the "R" terminal of the ignition switch and should be fused inline in the radio harness. Look for a thin yellow wire coming from the ignition switch. The thick yellow wire is the start signal.
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Chris M
1985 911 Carrera with a couple cosmetic only mods
2006 E90 330i
1999 E46 328i
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