Vehicle Speed Signal Check

Does speed meter is operated normally?

YES or NO 

YES : GO TO 2.

NO : Check combination meter trouble diagnosis. Refer to "COMBINATION METERS " article.

1. Turn the ignition switch OFF.
2. Disconnect NAVI control unit connector and combination meter connector.
3. Check continuity between NAVI control unit harness connector M57 terminal 8 (W/G) and combination meter harness connector M19 terminal 19 (W/G).
   Fig 1: Checking Continuity Between NAVI Control Unit And Combination Meter

   Courtesy of NISSAN MOTOR CO., U.S.A.
   1. Continuity should exist. 
4. Check continuity NAVI control unit harness connector M57 terminal 8(W/G) and ground.
   1. Continuity should not exist. 

OK or NG 

OK : GO TO 3.

NG :

• Check harness for open or short between NAVI control unit and combination meter.
• Check connector housings for disconnected or loose terminals.

1. Connect NAVI control unit connector.
2. Turn the ignition switch ON.
3. Check voltage between NAVI control unit harness connector M57 terminal 8 (W/G) and ground.
   1. Approx 3.5 V or more 
   Fig 2: Checking VEHICLE SPEED SIGNAL Voltage Between NAVI Control Unit And Ground

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

OK or NG 

OK : GO TO 4.

NG : Replace NAVI control unit.

1. Connect combination meter connector.
2. Drive vehicle at a constant speed.
3. Check the signal between NAVI control unit harness connector M57 terminal 8 (W/G) and ground with CONSULT-II or oscilloscope.
   1. 8 (W/G ) - Ground : Refer to " TERMINALS AND REFERENCE VALUE FOR NAVI CONTROL UNIT   ". 
   Fig 3: Checking Signal Between NAVI Control Unit And Ground With CONSULT-II Or Oscilloscope

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

OK or NG 

OK : Replace NAVI control unit.

NG : Check combination meter system. Refer to "COMBINATION METERS " article.