AUDIO UNIT: Diagnosis Procedure

WARNING: This page is about a different car, the 2009 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FUSES

Check that the following fuses are not blown.

FUSE SPECIFICATIONS

Unit	Terminals	Signal name	Fuse No.
Audio unit	19	Battery power	24
Audio unit	7	Ignition switch ACC or ON	17

Are the fuses OK?

YES: GO TO 2.

NO: If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse.

POWER SUPPLY CIRCUIT CHECK

Disconnect audio unit connector M133.
Check voltage between the audio unit connector M133 and ground.

CONNECTOR TERMINAL VOLTAGE CHART

(+)		(-)	OFF	ACC	ON
Connector	Terminal	(-)	OFF	ACC	ON
M133	19	Ground	Battery voltage	Battery voltage	Battery voltage
M133	7	Ground	0V	Battery voltage	Battery voltage

Fig 1: Checking Voltage Between Audio Unit Connector M133 And Ground

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

Are the voltage results as specified?

YES: GO TO 3.

NO:

Check connector housings for disconnected or loose terminals.
Repair harness or connector.

GROUND CIRCUIT CHECK
Inspect audio unit case ground.

Does case ground pass inspection?

YES: Inspection End.

NO: Repair audio unit case ground.