Diagnosis Procedure

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM - WITH NAVIGATION SYSTEM ".

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: Repair harness or connector.

3. HARNESS CHECK
   1. Disconnect BOSE speaker amp. connectors and subwoofer connector.
   2. Check continuity between BOSE speaker amp. harness connectors B74 (A) and B75 (B) and subwoofer harness connector B72 (C).

      Connector	Terminal	Connector	Terminal	Continuity
      A: B74	3	C: B72	1	Yes
      	19		2
      B: B75	22		4

   3. Check continuity between BOSE speaker amp. harness connector B74 (A) and B75 (B) and ground.

      Connector	Terminal	-	Continuity
      A: B74	3	Ground	No
      	19
      B: B75	22

   Fig 1: Checking Continuity Between Bose Speaker Amp. Connectors B74 (A), B75 (B) Terminals And Subwoofer Connectors B72 (C) Terminals

   Courtesy of NISSAN NORTH AMERICA, INC.

   Are the continuity test results as specified? 

   YES: GO TO 4

   NO: Repair harness or connector.

4. SUBWOOFER AMP ON SIGNAL CHECK
   1. Connect BOSE speaker amp. connector B74.
   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. connectors and subwoofer connector.
   2. Turn ignition switch to ACC.
   3. Push "POWER" switch.
   4. Check the signal between BOSE speaker amp. harness connector B74 terminals with CONSULT or oscilloscope.

      Connector	Terminals		Condition	Reference signal
      	(+)	(-)
      B74	19	3	Receive audio signal

   Fig 3: Checking Signal Between Bose Speaker Amp. Connector B74 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 M39 and BOSE speaker amp. connector B75.
   3. Check continuity between AV control unit harness connector M39 (A) and BOSE speaker amp. harness connector B75 (B).

      A		B		Continuity
      Connector	Terminal	Connector	Terminal
      M39	4	B75	26	Yes
      	5		25
      	13		24
      	14		23

   4. Check continuity between AV control unit harness connector M39 (A) and ground.

      A		-	Continuity
      Connector	Terminal
      M39	4	Ground	No
      	5
      	13
      	14

   Fig 4: Checking Continuity Between AV Control Unit Connector M39 (A) Terminals And Bose Speaker Amp. Connectors B75 (B) Terminals

   Courtesy of NISSAN NORTH AMERICA, INC.

   Are the continuity test results as specified? 

   YES: GO TO 7

   NO: Repair harness or connector.

7. BACK DOOR SPEAKER SIGNAL CHECK
   1. Connect AV control unit connector M39 and BOSE speaker amp. connector B75.
   2. Turn ignition switch to ACC.
   3. Push "POWER" switch.
   4. Check the signal between AV control unit harness connector M39 terminals with CONSULT or oscilloscope.

      Connector	Terminals		Condition	Reference signal
      	(+)	(-)
      M39	4	5	Receive audio signal
      	13	14

   Fig 5: Checking Signal Between AV Control Unit Harness Connector M39 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 ".