Sound is Not Heard From Center Speaker (BOSE System)

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

HARNESS CHECK
1. Disconnect BOSE speaker amp. connector M113 and center speaker connector M110.
2. Check continuity between BOSE speaker amp. harness connector M113 terminals and center speaker harness connector M110 terminals.
  
  Fig 1: Checking Continuity Between Bose Speaker AMP Harness Connector M113 Terminals & Center Speaker Harness Connector M110 Terminals
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 2: Connector M113 Terminal (Wire Color) Specification
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check continuity between BOSE speaker amp. harness connector M113 terminals and ground.
OK or NG
1. OK: GO TO 2.
2. NG:
  - Check connector housings for disconnected or loose terminals.
  - Repair harness or connector.
CENTER SPEAKER SIGNAL CHECK
1. Connect BOSE speaker amp. connector M113 and center speaker connector M110.
2. Turn ignition switch to ACC.
3. Push "POWER"switch.
4. Check the signal between BOSE speaker amp. harness connector M113 terminals with CONSULT-II or oscilloscope.
  
  Fig 4: Terminal Signal Reference Graph
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 5: Checking Center Speaker Signal
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: Replace center speaker. Refer to "REMOVAL AND INSTALLATION OF CENTER SPEAKER "
2. NG: Replace BOSE speaker amp. Refer to "REMOVAL AND INSTALLATION OF BOSE SPEAKER AMP. "