Vehicle Speed Signal Check for NAVI Control Unit

WARNING: This page is about a different car, the 2005 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.

CHECK HARNESS
1. Turn ignition switch OFF.
2. Disconnect NAVI control unit connector P107, display control unit connector M94 and combination meter connector M24.
  
  Fig 1: Checking Continuity Between Connector P107 Terminal 28 And Connector M24 Terminal 14 & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check continuity between NAVI control unit harness connector P107 terminal 28 (P/L) and combination meter harness connector M24 terminal 14 (P/L).
  Continuity should exist.
4. Check continuity between NAVI control unit harness connector P107 terminal 28 (P/L) and ground.
  Continuity should not exist.
OK or NG
1. OK: GO TO 2.
2. NG: Repair harness.
CHECK 1: VEHICLE SPEED SIGNAL
1. Connect NAVI control unit connector, display control unit connector and combination meter connector.
2. Turn ignition switch ON.
3. Check voltage between NAVI control unit harness connector P107 terminal 28 (P/L) and ground.
  
  Fig 2: Checking Voltage Between Terminal 28 & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Approx. 3.5V or more
OK or NG
1. OK: GO TO 3.
2. NG: Replace NAVI control unit. Refer to "REMOVAL AND INSTALLATION OF NAVI CONTROL UNIT ".
CHECK 2: VEHICLE SPEED SIGNAL
1. Drive vehicle at a constant speed.
2. Check signal between NAVI control unit harness connector P107 terminal 28 (P/L) and ground with CONSULT-II or oscilloscope.
  
  Fig 3: Checking Signal Between Terminal 28 & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  28 (P/L) - Ground: Refer to " TERMINALS AND REFERENCE VALUE FOR NAVI CONTROL UNIT ".
OK or NG
1. OK: Replace NAVI control unit. Refer to "REMOVAL AND INSTALLATION OF NAVI CONTROL UNIT ".
2. NG: Check combination meter system. Refer to "VEHICLE SPEED SIGNAL INSPECTION ".