A/C Operation is not Possible

Check Harness
1. Turn ignition switch OFF.
2. Disconnect connectors of A/C auto amp. and AV control unit.
3. Check continuity between A/C auto amp. harness connector M119 terminal 10 (R) and AV control unit harness connector M77 terminal 43 (R).
  
  Fig 1: Checking Harness (A/C Operation Is Not Possible)
  Courtesy of NISSAN MOTOR CO., U.S.A.
  1. Continuity should exist.
4. 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.
5. Check continuity between AV control unit harness connector M77 terminal 43 (R), 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 AV-A/C, 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 43 (R) and ground.
  
  Fig 2: Checking Voltage Between AV Control Unit Harness Connector M77 Terminal 43 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 amplifier.
Check AV-A/C, AC-CLK Communication Signal
1. Connect AV control unit connector.
2. Turn ignition switch ON.
3. Check voltage between AV control unit harness connector M77 terminals 43 (R), 45 (B) and ground with CONSULT-II or oscilloscope.
  
  Fig 3: Checking Voltage Between AV Control Unit Harness Connector M77 Terminals 43,45 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  1. 43 (R), 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.