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. connectors and suspect speaker connector.
   2. Check continuity between BOSE speaker amp. harness connectors M112 and M113 (A) and suspect speaker harness connector (B).

      A		B		Continuity
      Connector	Terminal	Connector	Terminal
      M112	6	D518	1	Yes
      	7		2
      M113	37	D716	1
      	27		2

   3. Check continuity between BOSE speaker amp. harness connectors M112 and M113 (A) and ground.

      Connector	Terminal	-	Continuity
      M112	6	Ground	No
      	7
      M113	37
      	27

      Fig 1: Checking Continuity Between Bose Speaker Amp. Harness Connectors & Ground

      Courtesy of NISSAN NORTH AMERICA, INC.

      Are the continuity test results as specified? 

      YES: GO TO 3.

      NO:

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

      Connector	Terminals		Condition	Reference signal
      	(+)	(-)
      M112	7	6	Receive audio signal
      M113	37	27

      Fig 2: Checking Back Door Speaker Signal Using Oscilloscope

      Courtesy of NISSAN NORTH AMERICA, INC.

      Are audio signal voltage readings as specified? 

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

      NO: GO TO 4.

4. HARNESS CHECK 
   1. Turn ignition switch OFF
   2. Disconnect AV control unit connector M72 and BOSE speaker amp. connector M113.
   3. 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	112	M113	21	Yes
      	118		22
      	108		23
      	114		33

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

      A		-	Continuity
      Connector	Terminal
      M72	112	Ground	No
      	118
      	108
      	114

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

      Courtesy of NISSAN NORTH AMERICA, INC.

      Are the continuity test results as specified? 

      YES: GO TO 5.

      NO:

      • Check connector housings for disconnected or loose terminals.
      • Repair harness or connector.
5. BACK DOOR SPEAKER SIGNAL CHECK 
   1. Connect AV control unit connector M72 and BOSE speaker amp. connector M113.
   2. Turn ignition switch to 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	112	118	Receive audio signal
      	108	114

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

      Courtesy of NISSAN NORTH AMERICA, INC.

      Is the audio signal voltage reading as specified? 

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

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