Unable to Operate System with A/C and AV Switch

Symptom: Unable to operate A/C system and audio system with A/C and AV switch. (Unable to start self-diagnosis.)

1. CHECK CONDITION 
   1. Turn ignition switch ON.
   2. Check if an image is displayed on the screen.

   Is an image displayed on the screen? 

   YES : GO TO 2.

   NO : Repair malfunctioning part. Refer to "ALL IMAGES ARE NOT DISPLAYED ".

2. SELF-DIAGNOSIS OF A/C AND AV SWITCH 

   Start self-diagnosis of A/C and AV switch, and check the self-diagnosis result. Refer to "A/C and AV Switch Self-Diagnosis Function ".

   OK or NG 

   OK : GO TO  4.

   NG : GO TO 3.

3. CHECK A/C AND AV SWITCH POWER SUPPLY AND GROUND CIRCUIT 
   1. Check voltage between A/C and AV switch harness connector terminals and ground.
      TERMINAL VOLTAGE CHART
      
      

      Terminals			OFF	ACC	ON
      (+)		(-)
      Connector	Terminal
      M64	1	Ground	Battery voltage	Battery voltage	Battery voltage
      	2		0 V	Battery voltage	Battery voltage

      Fig 1: Identifying Voltage Between A/C And AV Switch Harness Connector Terminals And Ground

      Courtesy of NISSAN MOTOR CO., U.S.A.
   2. Turn ignition switch OFF.
   3. Disconnect A/C and AV switch connector.
   4. Check continuity between A/C and AV switch harness connector M64 terminal 5 and ground.

      5 - Ground : Continuity should exist. 

   OK or NG 

   OK : Replace A/C and AV switch.

   NG : Repair harness or connector.

   Fig 2: Identifying Continuity Between A/C And AV Switch Harness Connector M64 Terminal 5 And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.
4. CHECK HARNESS 
   1. Turn ignition switch OFF.
   2. Disconnect display control unit and A/C and AV switch connectors.
   3. Check continuity between display control unit harness connector (A) M76 terminals 28, 30 and A/C and AV switch harness connector (B) M64 terminals 6, 8.
      Fig 3: Identifying Continuity Between Display Control Unit Harness Connector M76 Terminals 28, 30 And A/C And AV Switch Harness Connector M64 Terminals 6, 8

      Courtesy of NISSAN MOTOR CO., U.S.A.

      28 - 6 : Continuity should exist. 

      30 - 8 : Continuity should exist. 

   4. Check continuity between display control unit harness connector (A) M76 terminals 28, 30 and ground.

      28, 30 - Ground : Continuity should not exist. 

   OK or NG 

   OK : GO TO 5.

   NG : Repair harness or connector.

5. CHECK A/C AND AV SWITCH AND DISPLAY CONTROL UNIT 
   1. Replace A/C and AV switch or display control unit.
   2. Make sure that A/C system and audio system can be operated by A/C and AV switch.

   OK or NG 

   OK : INSPECTION END

   NG : Replace the other unit.