Communication Line Inspection

Check combination meter, unified meter and A/C amp. and terminals (combination meter side, unified meter and A/C amp. side, and harness side) for looseness or bent terminals.

OK or NG 

OK:  GO TO 2.

NG:  Repair terminal or connector.

Does the pointer on the meter/gauges fluctuate when starting the engine?

Is the fluctuation acceptable? 

YES:  GO TO 3.

NO:  GO TO  6.

1. Turn ignition switch OFF.
2. Disconnect combination meter and unified meter and A/C amp. connectors.
3. Check continuity between combination meter harness connector M24 terminal 22 and unified meter and A/C amp. harness connector M49 terminal 19.

   Continuity should exist  .

4. Check continuity between combination meter harness connector M24 terminal 22 and ground.

   Continuity should not exist  .

OK or NG 

OK:  GO TO 4.

NG:  Repair harness or connector.

Fig 1: Identifying Communication Circuit (TX: Combination Meter) Continuity

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

1. Connect unified meter and A/C amp. connector.
2. Turn ignition switch ON.
3. Check voltage between combination meter harness connector M24 terminal 22 and ground.

   Approx. 5V 

OK or NG 

OK:  GO TO 5.

NG:  Replace the unified meter and A/C amp. Refer to "UNIFIED METER AND A/C AMP. ".

Fig 2: Identifying Unified Meter And A/C Amp Voltage

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

1. Turn ignition switch OFF and connect combination meter connector.
2. Turn ignition switch ON.
3. Check voltage signal between combination meter harness connector M24 terminal 22 and ground with simple oscilloscope of CONSULT-II.

   22 - Ground: 

   Fig 3: Checking Voltage Waveform Pattern

   Courtesy of NISSAN MOTOR CO., U.S.A.
   Fig 4: Identifying Voltage Signal Between Combination Meter Harness Connector M24 Terminal 22 And Ground

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

OK or NG 

OK:  Replace the unified meter and A/C amp. Refer to "UNIFIED METER AND A/C AMP. ".

NG:  Replace the combination meter. Refer to "COMBINATION METER ".

1. Turn ignition switch OFF.
2. Disconnect combination meter and unified meter and A/C amp. connectors.
3. Check continuity between combination meter harness connector M24 terminal 21 and unified meter and A/C amp. harness connector M49 terminal 9.

   Continuity should exist  .

4. Check continuity between combination meter harness connector M24 terminal 21 and ground.

   Continuity should not exist  .

OK or NG 

OK:  GO TO 7.

NG:  Repair harness or connector.

Fig 5: Identifying Communication Circuit (RX: Combination Meter) Continuity

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

1. Connect combination meter connector.
2. Turn ignition switch ON.
3. Check voltage between unified meter and A/C amp. harness connector M49 terminal 9 and ground.

   Approx. 5V 

OK or NG 

OK:  GO TO 8.

NG:  Replace the combination meter. Refer to "COMBINATION METER ".

Fig 6: Identifying Combination Meter Voltage

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

1. Turn ignition switch OFF and connect unified meter and A/C amp. connector.
2. Turn ignition switch ON.
3. Check voltage signal between combination meter harness connector M24 terminal 21 and ground with simple oscilloscope of CONSULT-II.

   21 - Ground: 

   Fig 7: Checking Voltage Waveform Pattern

   Courtesy of NISSAN MOTOR CO., U.S.A.
   Fig 8: Identifying Voltage Signal Between Combination Meter Connector M24 Terminal 21 And Ground

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

OK or NG 

OK:  Replace the combination meter. Refer to "COMBINATION METER ".

NG:  Replace the unified meter and A/C amp. Refer to "UNIFIED METER AND A/C AMP. ".