Operating Screen for Audio and A/C is Not Displayed When Showing NAVI Screen

WARNING: This page is about a different car, the 2006 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

CHECK HARNESS
1. Turn ignition switch OFF.
2. Disconnect display control unit connector M95 and display unit connector M93.
3. Check continuity between display control unit harness connector M95 terminal 49, 51, 53, 55 and display unit harness connector M93 terminal 21, 9, 20, 8.
  Continuity should exist.
4. Check continuity between display control unit harness connector M95 terminal 49, 51, 53, 55 and ground.
  Continuity should not exist.
  
  Fig 1: Identifying Continuity Between Display Control Unit Harness Connector M95 Terminal 49, 51, 53, 55 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK : GO TO 2.
- NG : Repair harness.
CHECK HORIZONTAL SYNCHRONIZATION SIGNAL
1. Connect display control unit connector and display unit connector.
2. Turn ignition switch ON.
3. Check signal between display control unit connector M95 terminals 55 and 49 with CONSULT-II or oscilloscope.
  55 - 49 : Refer to " TERMINALS AND REFERENCE VALUE FOR DISPLAY CONTROL UNIT ".
OK or NG
- OK : GO TO 3.
- NG : Replace display unit. Refer to "DISPLAY UNIT ".
  
  Fig 2: Identifying Signal Between Display Control Unit Connector M95 Terminals 55 And 49
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK VERTICAL SYNCHRONIZATION SIGNAL
1. Turn ignition switch ON.
2. Check signal between display control unit connector M95 terminals 53 and 49 with CONSULT-II or oscilloscope.
  53 - 49 : Refer to " TERMINALS AND REFERENCE VALUE FOR DISPLAY CONTROL UNIT ".
OK or NG
- OK : GO TO 4.
- NG : Replace display unit. Refer to "DISPLAY UNIT ".
  
  Fig 3: Identifying Signal Between Display Control Unit Connector M95 Terminals 53 And 49
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK RGB AREA SIGNAL
1. Press the "TRIP" button.
2. Check signal between display control unit connector M95 terminals 51 and 49 with CONSULT-II or oscilloscope.
  51 - 49 : Refer to " TERMINALS AND REFERENCE VALUE FOR DISPLAY CONTROL UNIT ".
OK or NG
- OK : Replace display unit. Refer to "DISPLAY UNIT ".
- NG : Replace display control unit. Refer to "DISPLAY CONTROL UNIT ".
  
  Fig 4: Identifying Signal Between Display Control Unit Connector M95 Terminals 51 And 49
  Courtesy of NISSAN MOTOR CO., U.S.A.