Vehicle Speed Signal Inspection

WARNING: This page is about a different car, the 2005 Infiniti FX45 and 2005 Infiniti FX35. However, it is still accessible from the selected car via links, so may be relevant.

CHECK VEHICLE SPEED OPERATION
Start engine and drive vehicle.

Dose speedometer is operated normally?
1. YES : GO TO 2.
2. NO : Check combination meter trouble diagnosis. Refer to "TROUBLE DIAGNOSIS ".
CHECK HARNESS
1. Turn the ignition switch OFF.
2. Disconnect audio unit connector and unified meter and A/C amp. connector.
3. Check continuity between audio unit harness connector M60 terminal 22 (W/L) and unified meter and A/C amp. harness connector M56 terminal 34 (W/L).
  1. 22 (W/L) - 34(W/L) : Continuity should exist.
4. Check continuity between audio unit harness connector M60 terminal 22 (W/L) and ground.
  1. 22 (W/L) - Ground : Continuity should not exist.
Fig 1: Checking Continuity Between Audio Unit Harness Connector M60 Terminal 22 (W/L) And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK : GO TO 3.
2. NG : Repair harness or connector.
CHECK VEHICLE SPEED SIGNAL
1. Connect unified meter and A/C amp. connector.
2. Start engine and drive vehicle at more than 40 km/h (25MPH).
3. Check the signal between audio unit harness connector M60 terminal 22 (W/L) and ground with CONSULT-II or oscilloscope.
Fig 2: Checking Signal Between Audio Unit Harness Connector M60 Terminal 22
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 3: Connecting Unified Meter And A/C Amp. Connector
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK : INSPECTION END (System is OK.)
2. NG : Replace unified meter and A/C amp.