No A/C Display is Shown

Check Harness
1. Disconnect connectors of A/C auto amp. and AV control unit.
2. Check continuity between A/C auto amp. harness connector M119 terminal 9 (W) and AV control unit harness connector M77 terminal 44 (W).
  
  Fig 1: Checking Harness (No A/C Display)
  Courtesy of NISSAN MOTOR CO., U.S.A.
  1. Continuity should exist.
3. Check continuity between A/C auto amp. harness connector M119 terminal 20 (B) and AV control unit harness connector M77 terminal 45 (B).
  1. Continuity should exist.
4. Check continuity between AV control unit harness connector M77 terminals 44 (W), 45 (B) and ground.
  1. Continuity should not exist.
OK or NG
1. OK: Go to 2.
2. NG:
  - Check connector housings for disconnected or loose terminals.
  - Repair harness or connector.
Check A/C-AV, AC-CLK Communication Signal
1. Connect A/C auto amp. connector.
2. Turn ignition switch ON.
3. Check voltage between AV control unit harness connector M77 terminal 44 (W), 45 (B) and ground.
  
  Fig 2: Checking Voltage Between AV Control Unit Harness Connector M77 Terminal 44,45 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  1. Approx. 5V
OK or NG
1. OK: Go to 3.
2. NG: Replace A/C auto amp.
Check A/C-AV, AC-CLK Communication Signal
1. Connect AV control unit connector.
2. Turn ignition switch ON.
3. Check voltage signal between AV control unit harness connector M77 terminals 44 (W), 45 (B) and ground.
  
  Fig 3: Checking Voltage Signal Between AV Control Unit Harness Connector M77 Terminals 44,45 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  1. 44 (W), 45 (B) - Ground: Refer to TERMINALS AND REFERENCE VALUE FOR AV CONTROL UNIT
OK or NG
1. OK: Replace A/C auto amp.
2. NG: Replace AV control unit.