Power Supply Circuit Inspection

WARNING: This page is about a different car, the 2007 Nissan Pathfinder. 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.

FUSES SPECIFICATION

Unit	Terminals	Signal name	Fuse No.
Audio unit	6	Battery power	29
Audio unit	10	Ignition switch ACC or ON	4
AV switch	1	Battery power	29
AV switch	2	Ignition switch ACC or ON	4
BOSE speaker amp. (with BOSE)	1	Battery power	29
Display control unit	12	Ignition switch ON or START	12
Subwoofer (BOSE system)	6	Battery power	17

OK or NG

OK: GO TO 2.

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

POWER SUPPLY CIRCUIT CHECK

Disconnect audio unit connector M43, subwoofer connector B72 (with BOSE) and BOSE speaker amp. connector B74 (with BOSE).

Check voltage between the audio unit and ground.

TERMINAL SPECIFICATION

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 1: Checking Voltage Between Audio Unit Connector Terminals 6, 10 And Ground

Check voltage between subwoofer (BOSE system) and ground.

TERMINAL SPECIFICATION

Unit	Terminal No.			OFF	ACC	ON
	(+)		(-)
	Connector	Terminal	(-)
Subwoofer	B72	6	Ground	Battery voltage	Battery voltage	Battery voltage

Fig 2: Checking Voltage Between Subwoofer (BOSE System) Connector Terminal 6 And Ground

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

TERMINAL SPECIFICATION

Unit	Terminal No.			OFF	ACC	ON
	(+)		(-)
	Connector	Terminal	(-)
BOSE speaker amp.	B74	1	Ground	Battery voltage	Battery voltage	Battery voltage

Fig 3: Checking Voltage Between Bose Speaker Amp (With BOSE) Connector Terminal 1 And Ground

OK or NG

OK: GO TO 3.

NG:

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

GROUND CIRCUIT CHECK
Check continuity between subwoofer (BOSE system) harness connector B72 terminal 5 and BOSE speaker amp. (with BOSE) harness connector B74 terminal 17 and ground.

Continuity should exist.

OK or NG

OK: Inspection End.

NG:
- Check connector housings for disconnected or loose terminals.
- Repair harness or connector.
  
  Fig 4: Checking Continuity Between Connector Terminal 5 And Connector Terminal 17 And Ground