Nissan Altima (L32) 2007-2012 Service Manual ≻ Audio, visual & navigation system base audio ≻ Component diagnosis ≻ Power supply and ground circuit (coupe) Nissan Altima (L32) 2007-2012 Service Manual: Power supply and ground circuit (coupe) Audio unitSatellite radio tunerPower supply and ground circuit (sedan)Satellite radio tuner Component diagnosis ... Audio unit Diagnosis Procedure 1.CHECK FUSES Check that the following fuses are not blown. Are the fuses OK? YES >> GO TO 2 NO >> If fuse is blown, be sure to eliminate cause of malfunction be ...