BMW fault code AD4C
Audio system controller
ASD: RAD_ON Line: Short circuit to B+ or open circuit
Module version: Active Sound Design (ASD_89)
In: X5 (E70) 2006–2013, X6 (E71) 2008–2014, Z4 (E89) 2009–2016
Reading and clearing it
Fault code AD4C is a BMW code, stored in the car's audio system controller, not a generic OBD2 code (P0xxx): a generic OBD2 reader only reaches the engine's emissions faults, so it won't show it. AutoLingo for BMW reads it with BMW's own diagnostic protocols, in plain English, with the details the module stored about it, and clears it after a repair. If a fault comes right back after it's cleared, the problem is still there.
The audio system controller is on: 5 Series (E60), 5 Series (E61), 6 Series (E63), 6 Series (E64), 7 Series (E65), 7 Series (E66), 7 Series (E67), X5 (E70), X6 (E71), X6 (E72), 1 Series (E81), 1 Series (E82), X1 (E84), 1 Series (E87), 1 Series (E88), Z4 (E89), 3 Series (E90), 3 Series (E91), 3 Series (E92), 3 Series (E93)
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