Sound Is Not Heard From Center Speaker

WARNING: This page is about a different car, the 2005 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

HARNESS CHECK
1. Disconnect BOSE speaker amp. connector M112 and center speaker connector M110.
2. Check continuity between BOSE speaker amp. harness connector M112 terminals and center speaker harness connector M110 terminals.
  
  Fig 1: BOSE Speaker Amp. Connector M112 And Center Speaker Connector M110 Terminals Continuity Specifications
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 2: Checking Continuity Between BOSE Speaker Amp. Connector M112 Terminals And Center Speaker Connector M110 Terminals
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check continuity between BOSE speaker amp. harness connector M112 terminals and ground.
  
  Fig 3: BOSE Speaker Amp. Harness Connector M112 Terminals And Ground Continuity Specifications
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK: GO TO 2.
- NG:
  - Check connector housings for disconnected or loose terminals.
  - Repair harness or connector.
CENTER SPEAKER SIGNAL CHECK
1. Connect BOSE speaker amp. connector M112 and center speaker connector M110.
2. Turn ignition switch to ACC.
3. Push the "POWER" switch.
4. Check the signal between BOSE speaker amp. harness connector M112 terminals with CONSULT-II or oscilloscope.
  
  Fig 4: BOSE Speaker Amp. Harness Connector M112 Terminals, Reference Signal Specifications
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 5: Checking Signal Between BOSE Speaker Amp. Harness Connector M112 Terminals With CONSULT-II Or Oscilloscope
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK: Replace center speaker. Refer to "REMOVAL AND INSTALLATION OF CENTER SPEAKER ".
- NG: Replace BOSE speaker amp. Refer to "REMOVAL AND INSTALLATION OF BOSE SPEAKER AMP. "