Vehicle Speed Signal Check for NAVI Control Unit

WARNING: This page is about a different car, the 2004 Nissan Murano. However, it is still accessible from the selected car via links, so may be relevant.

CHECK VEHICLE SPEED OPERATION
Does speedometer is operated normally?

Yes or No
1. YES: GO TO 2.
2. NO: Check combination meter trouble diagnosis. Refer to "DIAGNOSIS FLOW ".
CHECK HARNESS
1. Turn ignition switch OFF.
2. Disconnect NAVI control unit connector, unified meter and A/C amp. connector, combination meter connector, display control unit connector and audio unit connector.
3. Check continuity between NAVI control unit harness connector M63 terminal 28 (V/W) and unified meter and A/C amp. harness connector M50 terminal 26 (V/W).
  Continuity should exist.
4. Check continuity between NAVI control unit harness connector M63 terminal 28 (V/W) and ground.
  Continuity should not exist.
  
  Fig 1: Checking Continuity Between NAVI Control Unit Harness Connector And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 3.
2. NG: Repair harness.
CHECK1: VEHICLE SPEED SIGNAL
1. Connect NAVI control unit connector.
2. Turn ignition switch ON.
3. Check voltage between NAVI control unit harness connector M63 terminal 28 (V/W) and ground.
  Approx. 5V
  
  Fig 2: Checking Voltage Between NAVI Control Unit Harness Connector And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 4.
2. NG: Replace NAVI control unit.
CHECK2: VEHICLE SPEED SIGNAL
1. Turn ignition switch OFF
2. Connect unified meter and A/C amp. connector, combination meter connector, display control unit connector and audio unit connector.
3. Drive vehicle at a constant speed.
4. Check signal between NAVI control unit harness connector M63 terminal 28 (V/W) and ground with CONSULT-II or oscilloscope.
  28 (V/W) - Ground: Refer to " TERMINALS AND REFERENCE VALUE FOR NAVI CONTROL UNIT ".
  
  Fig 3: Checking Signal Between NAVI Control Unit Harness Connector And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: Replace NAVI control unit.
2. NG: Replace unified meter and A/C amp. Refer to "REMOVAL AND INSTALLATION OF UNIFIED METER AND A/C AMP ".