Sound Is Not Heard From Rear Speaker or Rear Tweeter (Base and Mid Level 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 audio unit connector M44 and rear speaker and tweeter connector (LH or RH).
2. Check continuity between audio unit harness connector M44 terminal and suspect speaker harness connector terminal.
  
  Fig 1: Connector M44 Terminal (Wire Color) Specification
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 2: Checking Continuity Between Audio Unit Harness Connector M44 Terminal & Suspect Speaker Harness Connector Terminal
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check continuity between audio unit harness connector M44 terminal and ground.
Fig 3: Connector M44 Terminal Continuity Chart
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: GO TO 2.
2. NG:
  - Check connector housings for disconnected or loose terminals.
  - Repair harness or connector.
REAR SPEAKER SIGNAL CHECK
1. Connect audio unit connector and rear speaker connector.
2. Turn ignition switch to ACC.
3. Push "POWER" switch.
4. Check the signal between audio unit harness connector terminals with CONSULT-II or oscilloscope.
  
  Fig 4: Checking Signal Between Audio Unit Harness Connector Terminals
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 5: Terminal Signal Reference Graph
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: Replace rear speaker. Refer to "REMOVAL AND INSTALLATION OF REAR SPEAKER " or "REMOVAL AND INSTALLATION OF REAR TWEETER ".
2. NG: Replace audio unit. Refer to "REMOVAL AND INSTALLATION FOR AUDIO UNIT ".