Navigation System Is Not Operated by NAVI Switch

WARNING: This page is about a different car, the 2006 Infiniti G35. However, it is still accessible from the selected car via links, so may be relevant.

CHECK POWER SUPPLY AND GROUND CIRCUIT (DISPLAY UNIT AND NAVI SWITCH)
Check power supply and ground circuit. Refer to "POWER SUPPLY AND GROUND CIRCUIT INSPECTION FOR DISPLAY UNIT AND NAVI SWITCH ".

OK or NG

OK: GO TO 2.

NG: Repair malfunctioning parts.
CHECK HARNESS (BETWEEN NAVI SWITCH AND DISPLAY UNIT)
1. Turn ignition switch OFF.
2. Disconnect display unit connector and NAVI switch connector.
3. Check continuity between display unit harness connector M35 terminals 16, 20 and NAVI switch harness connector M37 terminals 5, 4.
  16 - 5: Continuity should exist .
  
  20 - 4: Continuity should exist .
  
  Fig 1: Identifying Continuity Between Display Unit Harness Connector M35 And Terminals 16
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check continuity between display unit harness connector M35 terminals 16, 20 and ground.
  16 - Ground: Continuity should exist .
  
  20 - Ground: Continuity should exist .
OK or NG

OK: GO TO 3.

NG: Repair harness or connector.
CHECK HARNESS (BETWEEN DISPLAY UNIT AND NAVI CONTROL UNIT)
1. Disconnect NAVI control unit connector and display unit connector.
2. Check continuity between NAVI control unit harness connector (A) M58 terminals 69, 70 and display unit harness connector (B) M35 terminals 14, 13.
  69 - 14: Continuity should exist .
  
  70 - 13: Continuity should exist .
  
  Fig 2: Identifying Continuity Between Navi Control Unit Harness Connector And M58 Terminals 69
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check continuity between NAVI control unit harness connector (A) M58 terminals 69, 70 and ground.
  69 - Ground: Continuity should exist .
  
  70 - Ground: Continuity should exist .
  
  Continuity should not exist .
OK or NG

OK: GO TO 4.

NG: Repair harness or connector.
CHECK NAVI SWITCH
Replace with normal NAVI switch and recheck the symptom.

Is the function normal?

YES: Replace with normal NAVI switch.

NO: GO TO 5.
CHECK DISPLAY UNIT
Replace with normal display unit and recheck the symptom.

Is the function normal?

YES: Replace with normal display unit.

NO: Replace NAVI control unit.