Power Supply Circuit Inspection

WARNING: This page is about a different car, the 2006 Nissan Titan. 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.

BLOWN FUSES REFERENCE

Unit	Terminals	Signal name	Fuse No.
Audio unit	6	Battery power	31
Audio unit	10	Ignition switch ACC or ON	4
AV switch (except Base)	1	Battery power	31
AV switch (except Base)	2	Ignition switch ACC or ON	4
Audio amp. (with Premium)	1	Battery power	31
Audio amp. (with Premium)	17	Battery power	17

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 .

POWER SUPPLY CIRCUIT CHECK

Disconnect audio unit connector M43 or audio amp. connector M112 (with Premium).

Check voltage between the audio unit and ground.

VOLTAGE SPECIFICATIONS

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: Identifying Voltage Between Audio Unit And Ground

Check voltage between audio amp. (with Premium) and ground.

VOLTAGE SPECIFICATIONS

Unit	Terminal No.			OFF	ACC	ON
	(+)		(-)
	Connector	Terminal	(-)
Audio amp.	M112	1	Ground	Battery voltage	Battery voltage	Battery voltage

OK or NG

OK : GO TO 3.

NG :

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

Fig 2: Identifying Voltage Between Audio Amp (With Premium) And Ground

GROUND CIRCUIT CHECK
1. Turn ignition switch OFF.
2. Check continuity between audio amp. (with Premium) harness connector M112 terminal 4, 20 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 3: Identifying Continuity Between Audio Amp. (With Premium) Harness Connector M112 Terminal 4, 20 And Ground