Diagnosis Procedure

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

1. CONNECTOR CHECK 

   Check the AV control unit, BOSE speaker amp. and subwoofer 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. VERIFY SUBWOOFER POWER AND GROUND SUPPLY 

   Check power and ground supply to the subwoofer. Refer to "SUBWOOFER: DIAGNOSIS PROCEDURE ".

   Did the power and ground supply check OK? 

   YES: GO TO 3.

   NO:

   • Check connector housings for disconnected or loose terminals.
   • Repair harness or connector.
3. HARNESS CHECK 
   1. Disconnect BOSE speaker amp. connector M112, M113 and subwoofer connector B72.
   2. Check continuity between BOSE speaker amp. harness connector M112 (A) and M113 (B) and subwoofer harness connector B72 (C).

      Connector	Terminal	Connector	Terminal	Continuity
      A: M112	9	C: B72	2	Yes
      	14		1
      B: M113	25		4

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

      Connector	Terminal	-	Continuity
      A: M112	9	Ground	No
      	14
      B: M113	25

      Fig 1: Checking Continuity Between Bose Speaker Amp. Harness Connector M112 (A) & M113 (B) & Ground

      Courtesy of NISSAN NORTH AMERICA, INC.

      Are the continuity test results as specified? 

      YES: GO TO 4.

      NO:

      • Check connector housings for disconnected or loose terminals.
      • Repair harness or connector.
4. SUBWOOFER AMP ON SIGNAL CHECK 
   1. Connect BOSE speaker amp. connector M112 and M113.
   2. Turn ignition switch to ACC.
   3. Push "POWER" switch.
   4. Check voltage between subwoofer connector B72 terminal 4 and ground.

      (+)		(-)	Voltage
      Connector	Terminal
      B72	4	Ground	Battery voltage

      Fig 2: Checking Voltage Between Subwoofer Connector B72 Terminal 4 And Ground

      Courtesy of NISSAN NORTH AMERICA, INC.

      Are the voltage readings as specified? 

      YES: GO TO 5.

      NO: Replace BOSE speaker amp. Refer to "REMOVAL AND INSTALLATION ".

5. SUBWOOFER AUDIO SIGNAL CHECK 
   1. Connect BOSE speaker amp. connector M112 and subwoofer connector B72.
   2. Turn ignition switch to ACC.
   3. Push "POWER" switch.
   4. Check the signal between BOSE speaker amp. harness connector M112 terminals with CONSULT or oscilloscope.

      Connector	Terminals		Condition	Reference signal
      	(+)	(-)
      M112	9	14	Receive audio signal

      Fig 3: Checking Signal Between Bose Speaker Amp. Harness Connector M112 Terminals Using Oscilloscope

      Courtesy of NISSAN NORTH AMERICA, INC.

      Is the audio signal voltage as specified? 

      YES: Replace subwoofer. Refer to "REMOVAL AND INSTALLATION ".

      NO: GO TO 6.

6. 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 4: Checking Continuity Between AV Control Unit Harness Connector M72 (A) And Ground

      Courtesy of NISSAN NORTH AMERICA, INC.

      Are the continuity test results as specified? 

      YES: GO TO 7.

      NO:

      • Check connector housings for disconnected or loose terminals.
      • Repair harness or connector.
7. SUBWOOFER 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 5: 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 ".