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Home >> Infiniti >> 2011 >> M37 x >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (Audio, Visual & Navigation System (BOSE Audio With Navigation)) >> DTC/Circuit Diagnosis >> DTC U121D: Av Control Unit >> Diagnosis Procedure
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Diagnosis Procedure

WARNING: This page is about a different car, the 2013 Infiniti M56 and 2013 Infiniti M37. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK PLAYBACK OF A DISK (CD) 

    Can a disk (CD) be played? 

    YES: Malfunction may be detected transitory.

    NO: Replace AV control unit. Refer to "REMOVAL AND INSTALLATION ".