Power Supply and Ground Circuit Inspection

WARNING: This page is about a different car, the 2007 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FUSE

Check for blown combination meter and unified meter and A/C amp. fuses.

COMBINATION METER AND UNIFIED METER AND A/C AMP. FUSES

Unit	Power source	Fuse No.
Combination meter	Battery	19
Unified meter and A/C amp.	Battery	19
Combination meter	Ignition switch ON or START	14
Unified meter and A/C amp.	Ignition switch ON or START	12
Unified meter and A/C amp.	Ignition switch ON	10, 11
Combination meter	Ignition switch ACC or ON	6
Unified meter and A/C amp.	Ignition switch ACC or ON	6

Refer to "WIRING DIAGRAM - METER - ".

OK or NG

OK: GO TO 2.

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

CHECK POWER SUPPLY CIRCUIT

Disconnect combination meter connector M24 and unified meter and A/C amp. connectors M50 and M89.

Check voltage between combination meter harness connector terminals and ground.

COMBINATION METER HARNESS CONNECTOR TERMINALS AND GROUND

Terminals			Ignition switch position
(+)		(-)	OFF	ACC	ON
Combination meter connector	Terminal	(-)	OFF	ACC	ON
M24	6	Ground	0V	Battery voltage	Battery voltage
	23		0V	0V	Battery voltage
	24		Battery voltage	Battery voltage	Battery voltage

Fig 1: Checking Voltage Between Combination Meter Connector Terminals And Ground

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

Check voltage between unified meter and A/C amp. harness connector terminals and ground.

UNIFIED METER AND A/C AMP. HARNESS CONNECTOR TERMINALS AND GROUND

Terminals			Ignition switch position
(+)		(-)	OFF	ACC	ON
Unified meter and A/C amp. connector	Terminal	(-)	OFF	ACC	ON
M50	21	Ground	Battery voltage	Battery voltage	Battery voltage
	22		0V	0V	Battery voltage
	35		0V	Battery voltage	Battery voltage
M89	46		0V	0V	Battery voltage

Fig 2: Checking Voltage Between Unified Meter And A/C Amp Connector Terminals And Ground

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

OK or NG

OK: GO TO 3.

NG: Check the following.

Harness for open or short between combination meter and fuse
Harness for open or short between unified meter and A/C amp. and fuse

CHECK GROUND CIRCUIT

Check continuity between combination meter harness connector terminals and ground.

COMBINATION METER HARNESS CONNECTOR TERMINALS AND GROUND

Terminals			Continuity
(+)		(-)
Connector	Terminal	(-)
M24	10	Ground	Yes
	11
	12

Fig 3: Checking Continuity Between Combination Meter Connector Terminals And Ground

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

Check continuity between unified meter and A/C amp. harness connector terminals and ground.

UNIFIED METER AND A/C AMP. HARNESS CONNECTOR TERMINALS AND GROUND

Terminals			Continuity
(+)		(-)
Connector	Terminal	(-)
M50	29	Ground	Yes
M50		Ground	30

Fig 4: Checking Continuity Between Unified Meter And A/C Amp Connector Terminals And Ground

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

OK or NG

OK: Inspection End.

NG: Repair harness or connector.