Diagnosis Procedure

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM ".

1. CONNECTOR CHECK 

   Check the AV control unit, BOSE speaker amp. and speaker connectors for the following:

   • Proper connection
   • Damage
   • Disconnected or loose terminals

     Is the inspection result normal? 

     YES: GO TO 2.

     NO: Repair the terminal and connector.

2. HARNESS CHECK 
   1. Disconnect BOSE speaker amp. connector M113 and center speaker connector M110.
   2. Check continuity between BOSE speaker amp. harness connector M113 (A) and center speaker harness connector M110 (B).

      A		B		Continuity
      Connector	Terminal	Connector	Terminal
      M113	15	M110	1	Yes
      	28		2

   3. Check continuity between BOSE speaker amp. harness connector M113 (A) and ground.

      A		-	Continuity
      Connector	Terminal
      M113	15	Ground	No
      	28

      Fig 1: Checking Continuity Between Bose Speaker Amp. Harness Connector M113 (A) And Ground

      Courtesy of NISSAN NORTH AMERICA, INC.

      Are continuity test results as specified? 

      YES: GO TO 3.

      NO:

      • Check connector housings for disconnected or loose terminals.
      • Repair harness or connector.
3. CENTER SPEAKER SIGNAL CHECK 
   1. Connect BOSE speaker amp. connector M113 and center speaker connector M110.
   2. Turn ignition switch to ACC.
   3. Push "POWER" switch.
   4. Check the signal between BOSE speaker amp. harness connector M113 terminals with CONSULT or oscilloscope.

      Connector	Terminals		Condition	Reference signal
      	(+)	(-)
      M113	15	28	Receive audio signal

      Fig 2: Checking Signal Between Bose Speaker Amp. Harness Connector M113 Terminals Using Oscilloscope

      Courtesy of NISSAN NORTH AMERICA, INC.

      Is the audio signal voltage reading as specified? 

      YES: Replace center speaker. Refer to "REMOVAL AND INSTALLATION ".

      NO: GO TO 4.

4. HARNESS CHECK 
   1. Disconnect AV control unit connector M72 and BOSE speaker amp. connector M113.
   2. Check continuity between AV control unit harness connector M72 (A) and BOSE speaker amp. harness connector M113 (B).

      A		B		Continuity
      Connector	Terminal	Connector	Terminal
      M72	113	M113	18	Yes
      	119		32
      	109		19
      	115		20

   3. Check continuity between AV control unit harness connector M72 (A) and ground.

      A		-	Continuity
      Connector	Terminal
      M72	113	Ground	No
      	119
      	109
      	115

      Fig 3: Checking Continuity Between AV Control Unit Harness Connector M72 (A) And Ground

      Courtesy of NISSAN NORTH AMERICA, INC.

      Are continuity test results as specified? 

      YES: GO TO 5.

      NO:

      • Check connector housings for disconnected or loose terminals.
      • Repair harness or connector.
5. CENTER SPEAKER SIGNAL CHECK 
   1. Connect AV control unit connector and BOSE speaker amp. connector.
   2. Turn ignition switch ACC.
   3. Push "POWER" switch.
   4. Check the signal between AV control unit harness connector M72 terminals with CONSULT or oscilloscope.

      Connector	Terminals		Condition	Reference signal
      	(+)	(-)
      M72	113	119	Receive audio signal
      	109	115

      Fig 4: Checking Signal Between AV Control Unit Harness Connector M72 Terminals Using Oscilloscope

      Courtesy of NISSAN NORTH AMERICA, INC.

      Are the audio signal voltage readings as specified? 

      YES: Replace BOSE speaker amp. Refer to "REMOVAL AND INSTALLATION ".

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