Vehicle Speed Signal Check for NAVI Control Unit

WARNING: This page is about a different car, the 2008 Nissan Maxima. 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 M97 and unified meter and A/C amp. connector M50.
3. Check continuity between NAVI control unit harness connector M97 (B) terminal 66 and unified meter and A/C amp. harness connector M50 (A) terminal 26.
  Continuity should exist.
4. Check continuity between NAVI control unit harness connector M97 (B) terminal 66 and ground.
  Continuity should not exist.
Fig 1: Checking Continuity Between NAVI Control Unit Connector M97 Terminal 66 And Connector M50 Terminal 26
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 2.

NG: Repair harness.
CHECK 1: VEHICLE SPEED SIGNAL
1. Connect NAVI control unit connector M97 and unified meter and A/C amp. connector M50.
2. Turn ignition switch ON.
3. Check voltage between NAVI control unit harness connector M97 terminal 66 and ground.
  Approx. 3.5V or more
Fig 2: Checking Voltage Between Navi Control Unit Connector B152 Terminal 66 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 3.

NG: Replace NAVI control unit. Refer to "NAVI CONTROL UNIT ".
CHECK 2: VEHICLE SPEED SIGNAL
1. Drive vehicle at a constant speed.
2. Check signal between NAVI control unit harness connector M97 terminal 66 and ground with CONSULT-III or oscilloscope.
  66 - Ground: Refer to "TERMINALS AND REFERENCE VALUE FOR NAVI CONTROL UNIT ".
Fig 3: Checking Signal Between NAVI Control Unit Connector M97 Terminal 66 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: Replace NAVI control unit. Refer to "NAVI CONTROL UNIT ".

NG: Check combination meter system. Refer to "VEHICLE SPEED SIGNAL INSPECTION ".