Audio Not Muted with PTT Switch Pushed ON

WARNING: This page is about a different car, the 2003 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.

CHECK AUDIO UNIT CIRCUIT
1. Disconnect voice activated control module connector and Audio unit connector.
2. Check the following.
  - Continuity between voice activated control module harness connector B69 terminal 27 (Y/R) and Audio unit harness connector M87 terminal 9 (OR)
    1. Continuity should exist.
  - Continuity between voice activated control module harness connector B69 terminal 27 (Y/R) and ground
    1. Continuity should not exist.
  Fig 1: Checking Audio Unit Circuit
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG

OK >> GO TO 2.

NG >> Repair harness or connector.
CHECK AUDIO UNIT MUTE SIGNAL
1. Connect voice activated control module connector and audio unit connector.
2. Turn ignition switch ON.
3. Check voltage between voice activated control module and ground.
  
  Fig 2: Checking Audio Unit Mute Signal
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 3: Identifying Terminal Voltage Table (Audio Unit)
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG

OK >> Replace audio unit.

NG >> Replace voice activated control module.