Vehicle Speed Signal Check for NAVI Control Unit

WARNING: This page is about a different car, the 2003 Nissan Murano. 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 unified meter and A/C amp. 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).
  1. Continuity should exist.
4. Check continuity between NAVI control unit harness connector M63 terminal 28 (V/W) 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 M63 Terminal 28 And Unified Meter And A/C Amp Harness Connector M50 Terminal 26
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK1: VEHICLE SPEED SIGNAL
1. Connect NAVI control unit connector and unified meter and A/C amp. connector.
2. Turn ignition switch ON.
3. Check voltage between NAVI control unit harness connector M63 terminal 28 (V/W) and ground.
  1. Approx. 3.5V or more
OK or NG
1. OK : GO TO 3.
2. NG : Replace NAVI control unit.
Fig 2: Checking Voltage Between NAVI Control Unit Harness Connector M63 Terminal 28 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK2: VEHICLE SPEED SIGNAL
1. Drive vehicle at a constant speed.
2. Check signal between NAVI control unit harness connector M63 terminal 28 (V/W) and ground with CONSULT-II or oscilloscope.
  1. 28 (V/W) - Ground : Refer to " TERMINALS AND REFERENCE VALUE FOR NAVI CONTROL UNIT ".
OK or NG
1. OK : Replace NAVI control unit.
2. NG : Check combination meter system. Refer to DIAGNOSIS FLOW .
Fig 3: Checking Voltage Between NAVI Control Unit Harness Connector M63 Terminal 28 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.