Power Supply and Ground Circuit Inspection

1. CHECK FUSE 

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

   FUSE POWER SOURCE SPECIFICATION
   
   

   Unit	Power source	Fuse No.
   Combination meter	Battery	19
   Unified meter and A/C amp.
   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

   Refer to "WIRING DIAGRAM - METER -  ".

   OK or NG

   1. OK: GO TO 2.
   2. NG: If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse. Refer to POWER SUPPLY ROUTING CIRCUIT .
2. CHECK POWER SUPPLY CIRCUIT 
   1. Disconnect combination meter connector and unified meter and A/C amp. connector.
   2. Check voltage between combination meter harness connector terminals and ground.
      Fig 1: Checking Power Supply Circuit

      Courtesy of NISSAN MOTOR CO., U.S.A.
      IGNITION SWITCH TERMINALS SPECIFICATION
      
      

      Terminals			Ignition switch position
      (+)		(-)	OFF	ACC	ON
      Connector	Terminal (Wire color)
      M24	24 (Y/R)	Ground	Battery voltage	Battery voltage	Battery voltage
      	23 (O)		0V	0V	Battery voltage

   3. Check voltage between unified meter and A/C amp. harness connector terminals and ground.
      Fig 2: Checking Voltage Between Unified Meter And A/C Amp. Harness Connector Terminals And Ground

      Courtesy of NISSAN MOTOR CO., U.S.A.
   IGNITION SWITCH TERMINALS SPECIFICATION
   
   

   Terminals			Ignition switch position
   (+)		(-)	OFF	ACC	ON
   Connector	Terminal (Wire color)
   m50	21 (Y/R)	Ground	Battery voltage	Battery voltage	Battery voltage
   	22 (G)		0V	0V	Battery voltage
   M89	46 (W/L)		0V	0V	Battery voltage

   OK or NG

   1. OK: GO TO 3.
   2. 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
3. CHECK GROUND CIRCUIT 

   Check continuity between combination meter harness connector terminals and ground.

   TERMINALS CONTINUITY SPECIFICATION
   
   

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

   Fig 3: Checking Ground Circuit

   Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check continuity between unified meter and A/C amp. harness connector terminals and ground.

OK or NG

1. OK: INSPECTION END
2. NG: Repair harness or connector.
   Fig 4: Checking Continuity Between Unified Meter And A/C Amp. Harness Connector Terminals And Ground

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