Sound Is Not Heard From Front Door Speaker or Front 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 M43 and front door speaker and tweeter connector (LH or RH).
2. Check continuity between audio unit harness connector M43 terminal and suspect speaker or tweeter harness connector terminal.
  
  Fig 1: Connector M43 Terminal (Wire Color) Specifications
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 2: Checking Continuity Between Audio Unit Harness Connector M43 Terminal & Suspect Speaker Or Tweeter Harness Connector Terminal
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check continuity between audio unit harness connector M43 terminal and ground.
  
  Fig 3: Connector M43 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.
FRONT SPEAKER SIGNAL CHECK
1. Connect audio unit connector and front speaker or tweeter 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 speaker. Refer to "REMOVAL AND INSTALLATION OF FRONT DOOR SPEAKER " or "REMOVAL AND INSTALLATION OF FRONT TWEETER ".
2. NG: Replace audio unit. Refer to "REMOVAL AND INSTALLATION FOR AUDIO UNIT ".