Vehicle Speed Signal Check for Display Control Unit

1. Turn ignition switch OFF.
2. Disconnect display control unit connector, combination meter connector, NAVI control unit connector and shift lock control unit connector.
3. Check continuity between display control unit harness connector M94 terminal 16 and combination meter harness connector M24 terminal 3.

   Continuity should exist. 

4. Check continuity between display control unit harness connector M94 terminal 16 and ground.

   Continuity should not exist. 

   Fig 1: Checking Continuity Between Display Control Unit & Combination Meter And Display Control Unit & Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

OK: GO TO 2.

NG: Repair harness.

1. Connect display control unit connector.
2. Turn ignition switch ON.
3. Check voltage between display control unit harness connector M94 terminal 16 and ground.

   Approx. 3.5V or more 

Fig 2: Checking Voltage Between Display Control Unit Connector M94 Terminal 16 And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

OK: GO TO 3.

NG: Replace display control unit. Refer to DISPLAY CONTROL UNIT  .

1. Connect combination meter connector, NAVI control unit connector and shift lock control unit connector.
2. Drive vehicle at a constant speed.
3. Check signal between display control unit harness connector M94 terminal 16 and ground with CONSULT-II or oscilloscope.

   16 - Ground: Refer to , " TERMINALS AND REFERENCE VALUE FOR DISPLAY CONTROL UNIT  ". 

Fig 3: Checking Signal Between Display Control Unit Connector M94 Terminal 16 And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

OK: Replace display control unit. Refer to DISPLAY CONTROL UNIT  .

NG: Check combination meter system. Refer to , "VEHICLE SPEED SYSTEM ".