Vehicle Speed Signal Check for Display Control Unit

Does speedmeter is operated normally?

Yes or No

1. Yes: GO TO 2.
2. NO: Check combination meter trouble diagnosis. Refer to DIAGNOSIS FLOW .

1. Turn ignition switch OFF.
2. Disconnect display control unit connector and combination unified meter and A/C amp. connector.
3. Check continuity between display control unit harness connector M75 terminal 16 (R/G) and unified meter and A/C amp. harness connector M56 terminal 26 (R/G).

   Continuity should exist. 

4. Check continuity between display control unit harness connector M75 terminal 16 (R/G) and ground.

   Continuity should not exist. 

   Fig 1: Checking Continuity Between Display Control Unit Harness Connector M75 Terminal 16 (R/G) And Unified Meter And A/C Amp. Harness Connector M56 Terminal 26 (R/G)

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

OK or NG

1. OK: GO TO 3.
2. NG: Repair harness or connector.

1. Connect display control unit and unified meter and A/C amp. connector.
2. Start the engine.
3. Drive vehicle at a constant speed.
4. Check signal between display control unit harness connector M75 terminal 16 (R/G) and ground with CONSULT-II or oscilloscope.

   16 (R/G) - Ground: Refer to  Terminals and Reference Value for Display Control unit   . 

OK or NG

1. OK: Replace display control unit.
2. NG: Check unified meter and A/C amp. system. Refer to VEHICLE SPEED SIGNAL INSPECTION
   Fig 2: Checking Signal Between Display Control Unit Harness Connector M75 Terminal 16 (R/G) And Ground With CONSULT-II Or Oscilloscope

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