Diagnosis Procedure

For Wiring Diagram information, refer to appropriate wiring diagram.

1. CONNECTOR CHECK 

   Check the audio unit 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 terminals or connectors.

2. CHECK REAR DOOR SPEAKER SIGNAL CIRCUIT CONTINUITY 
   1. Disconnect audio unit connector M171 and suspect rear door speaker connector.
   2. Check continuity between audio unit connector M171 and suspect rear door speaker connector.
      CREW CAB
      
      

      Audio unit		Rear door speaker		Continuity
      Connector	Terminal	Connector	Terminal
      M171	4	D207 (LH)	1	Yes
      	5		2
      	13	D307 (RH)	1
      	14		2

      KING CAB®
      
      

      Audio unit		Rear door speaker		Continuity
      Connector	Terminal	Connector	Terminal
      M171	4	B4 (LH)	1	Yes
      	5		2
      	13	B120 (RH)	1
      	14		2

   3. Check continuity between audio unit connector M171 and ground.

      Audio unit		Ground	Continuity
      Connector	Terminal
      M171	4	-	No
      	5
      	13
      	14

   Is the inspection result normal?

   YES

   GO TO 3 .

   NO

   Repair or replace harness or connectors.

3. CHECK REAR DOOR SPEAKER SIGNAL 
   1. Connect audio unit connector M43 and suspect rear door speaker connector.
   2. Turn ignition switch to ACC.
   3. Push audio unit POWER switch.
   4. Check signal between audio unit connector M171 and ground.

      Audio unit connector M171		Condition	Reference value
      (+)	(-)
      Terminal	Terminal
      4	5	Audio signal output	Courtesy of NISSAN NORTH AMERICA, INC.
      13	14

   Is the inspection result normal?

   YES

   Replace rear door speaker. Refer to Removal and Installation .

   NO

   Replace audio unit. Refer to Removal and Installation .