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 (W/R) and combination meter harness connector M24 terminal 29 (W/R).
   Fig 1: Checking Continuity Between Display Control Unit And Combination Meter

   Courtesy of NISSAN MOTOR CO., U.S.A.
   1. Continuity should exist. 
4. Check continuity between display control unit harness connector M94 terminal 16 (W/R) and ground.
   1. Continuity should not exist. 

OK or NG

1. OK: GO TO 2.
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 (W/R) and ground.
   Fig 2: Checking Voltage Between Display Control Unit And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.
   1. Approx. 3.5V or more 

OK or NG

1. OK: GO TO 3.
2. NG: Replace display control unit. Refer to REMOVAL AND INSTALLATION OF 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 (W/R) and ground with CONSULT-II or oscilloscope.
   Fig 3: Checking Voltage Between Display Control Unit Harness Connector Terminals And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.
   1. 16 (W/R) - Ground: Refer to  TERMINALS AND REFERENCE VALUE FOR DISPLAY CONTROL UNIT   . 

OK or NG

1. OK: Replace display control unit. Refer to REMOVAL AND INSTALLATION OF DISPLAY CONTROL UNIT  .
2. NG: Check combination meter system. Refer to , "VEHICLE SPEED SIGNAL INSPECTION ".