Diagnosis Procedure

WARNING: This page is about a different car, the 2008 Infiniti M45 and 2008 Infiniti M35. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FRONT DISPLAY UNIT POWER SUPPLY AND GROUND CIRCUIT
Check front display unit power supply and ground circuits. Refer to DIAGNOSIS PROCEDURE .

Is the inspection result normal?

Yes: GO TO 2.

No: Repair malfunctioning parts.
CHECK CONTINUITY COMMUNICATION CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect front display unit connector and AV control unit connector.
3. Check continuity between front display unit harness connector terminals 11, 22 and AV control unit harness connector terminals 102, 103.
  11 - 102: Continuity should exist.
  
  22 - 103: Continuity should exist.
4. Check continuity between front display unit harness connector terminals 11, 22 and ground.
  11, 22 - Ground: Continuity should not exist.
Is the inspection result normal?

Yes: GO TO 3.

No: Repair harness or connector.

CHECK SERIAL COMMUNICATION SIGNAL

Connect front display unit connector and AV control unit connector.
Turn ignition switch ON.

Check signal between front display unit harness connector terminal 11 and ground.

SIGNAL REFERENCE TABLE

Terminal	Condition		Reference value
11 - Ground	Ignition switch ON	When adjusting front display brightness.	Courtesy of NISSAN MOTOR CO., U.S.A.

Is the inspection result normal?

Yes: GO TO 4.

No: Replace AV control unit.

CHECK SERIAL COMMUNICATION SIGNAL

Check signal between front display unit harness connector terminal 22 and ground.

SIGNAL REFERENCE TABLE

Terminal	Condition		Reference value
22 - Ground	Ignition switch ON	When adjusting front display brightness.	Courtesy of NISSAN MOTOR CO., U.S.A.

Is the inspection result normal?

Yes: INSPECTION END

No: Replace front display unit.