Vehicle Speed Signal Check for NAVI Control Unit

WARNING: This page is about a different car, the 2004 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 and combination meter connector.
3. Check continuity between NAVI control unit harness connector P107 terminal 28 (P/L) and combination meter harness connector M24 terminal 14 (P/L).
  1. Continuity should exist.
4. Check continuity between NAVI control unit harness connector P107 terminal 28 (P/L) and ground.
  1. Continuity should not exist.
  OK or NG
  1. OK: GO TO 2.
  2. NG: Repair harness.
    
    Fig 1: Checking Continuity Between NAVI Control Unit Harness Connector P107 Terminal 28 (P/L) And Ground
    Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK 1: VEHICLE SPEED SIGNAL
1. Connect NAVI 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.
1. 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 .
  
  Fig 2: Checking Voltage Between NAVI Control Unit Harness Connector P107 Terminal 28 (P/L) And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
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.
1. 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 .
  
  Fig 3: Checking Signal Between NAVI Control Unit Harness Connector P107 Terminal 28 (P/L) And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.