Power Supply Circuit Inspection

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

CHECK FUSE

Check that the following fuses of the subwoofer amp. (base system), AV switch (with NAVI), BOSE speaker amp. (with BOSE) and audio unit are not blown.

FUSE REFERENCE

Unit	Terminals	Signal name	Fuse No.
Audio unit	19 (without NAVI) 6 (with NAVI)	Battery power	31
Audio unit	7 (without NAVI) 10 (with NAVI)	Ignition switch ACC or ON	6
AV switch	1	Battery power	3
Subwoofer amp. (base system)	9	Ignition switch ACC or ON	4
BOSE speaker amp. (with BOSE)	1	Battery power	31

OK or NG

OK: GO TO 2.

NG: If fuse is blown, be sure to eliminate cause of problem before installing new fuse. Refer to "POWER SUPPLY ROUTING CIRCUIT ".

AUDIO UNIT POWER SUPPLY CIRCUIT CHECK

Disconnect audio unit connector.

Check voltage between the audio unit (without NAVI) and ground.

AUDIO UNIT (WITHOUT NAVI) AND GROUND

Unit	Terminal No.			OFF	ACC	ON
	(+)		(-)
	Connector	Terminal	(-)
Audio unit	M51	19	Ground	Battery voltage	Battery voltage	Battery voltage
Audio unit	M51	7	Ground	0V	Battery voltage	Battery voltage

Fig 1: Checking Voltage Between Audio Unit (Without NAVI) And Ground

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

Check voltage between the audio unit (with NAVI) and ground.

AUDIO UNIT (WITH NAVI) AND GROUND

Unit	Terminal No.			OFF	ACC	ON
	(+)		(-)
	Connector	Terminal	(-)
Audio unit	M43	6	Ground	Battery voltage	Battery voltage	Battery voltage
Audio unit	M43	10	Ground	0V	Battery voltage	Battery voltage

Fig 2: Checking Voltage Between Audio Unit (With NAVI) And Ground

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

OK or NG

OK: GO TO 3.

NG:

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

SUB WOOFER AMP (BASE SYSTEM) OR BOSE SPEAKER AMP (WITH BOSE) POWER SUPPLY CIRCUIT CHECK

Disconnect subwoofer amp. connector.

Check voltage between subwoofer amp. (base system) and ground.

SUBWOOFER AMP. (BASE SYSTEM) AND GROUND

Unit	Terminal No.			OFF	ACC	ON
	(+)		(-)
	Connector	Terminal	(-)
Sub-woofer amp.	B133	9	Ground	0V	Battery voltage	Battery voltage

Fig 3: Checking Voltage Between Subwoofer Amp. (Base System) And Ground

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

Check voltage between BOSE speaker amp. (with BOSE) and ground.

BOSE SPEAKER AMP. (WITH BOSE) AND GROUND

Unit	Terminal No.			OFF	ACC	ON
	(+)		(-)
	Connector	Terminal	(-)
BOSE speaker amp.	B127	1	Ground	Battery voltage	Battery voltage	Battery voltage

Fig 4: Checking Voltage Between Bose Speaker Amp (With Bose) And Ground

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

OK or NG

OK: GO TO 4.

NG:

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

GROUND CIRCUIT CHECK
Check continuity between subwoofer amp. (base system) harness connector B133 terminal 7 or BOSE speaker amp. (with BOSE) harness connector B127 terminal 17 and ground.

Continuity should exist.

Fig 5: Checking Continuity Between Subwoofer Amp. (Base System) Connector B133 Terminal 7 Or BOSE Speaker Amp. (With Bose) Harness Connector B127 Terminal 17 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: Inspection End.

NG:
- Check connector housings for disconnected or loose terminals.
- Repair harness or connector.