Diagnosis Procedure

WARNING: This page is about a different car, the 2008 Infiniti EX35. However, it is still accessible from the selected car via links, so may be relevant.

CHECK POWER SUPPLY CIRCUIT (DISPLAY SIDE)

Check voltage between display unit harness connectors and ground.

TERMINALS REFERENCE

Signal name	Connector No.	Terminal No.	Ignition switch position	Value (Approx.)
Inverter VCC	M71	2	ACC	9 V
Signal VCC	M71	3	ACC	9 V

Is the inspection result normal?

YES: GO TO 4.

NO: GO TO 2.

CHECK POWER SUPPLY CIRCUIT (CONTINUITY)

Turn ignition switch OFF.
Disconnect the harness connector between display unit and AV control unit.

Check continuity between display unit harness connectors and AV control unit harness connector.

TERMINALS CONTINUITY SPECIFICATION

Signal name	Display unit (M71)	AV control unit (M83)	Continuity
Inverter VCC	2	59	Existed
Signal VCC	3	47	Existed

Check continuity between display unit harness connectors and ground.

TERMINALS CONTINUITY SPECIFICATION

Signal name	Display unit (M71)	-	Continuity
Inverter VCC	2	Ground	Not existed
Signal VCC	3	Ground	Not existed

Is the inspection result normal?

YES: GO TO 3.

NO: Repair harness or connector.

CHECK POWER SUPPLY CIRCUIT (AV CONTROL UNIT SIDE)

Connect the AV control unit harness connector.
Turn ignition switch ACC.

Check voltage between AV control unit harness connectors and ground.

TERMINALS REFERENCE

Signal name	Connector No.	Terminal No.	Ignition switch position	Value (Approx.)
Inverter VCC	M83	59	ACC	9 V
Signal VCC	M83	47	ACC	9 V

Is the inspection result normal?

YES: INSPECTION END

NO: Replacement of AV control unit.

CHECK GROUND CIRCUIT

Turn ignition switch OFF.
Disconnect display unit connector.

Check continuity between display unit harness connector and ground.

TERMINALS CONTINUITY SPECIFICATION

Signal name	Connector No.	Terminal No.	Ignition switch position	Continuity
Ground	M71	1	OFF	Existed

Is the inspection result normal?

YES: INSPECTION END

NO: Repair harness or connector.