Vehicle Speed Signal Check

WARNING: This page is about a different car, the 2003 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.

HARNESS CHECK
1. Turn ignition switch OFF.
2. Disconnect AV and NAVI control unit connector and combination meter connector.
3. Check continuity between AV and NAVI control unit harness connector B29 terminal 28 (OR/L) and combination meter harness connector M41 terminal 37 (OR/L).
  1. Continuity should exist.
  Fig 1: Checking Continuity Between AV & NAVI Control Unit & Combination Meter
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check continuity between AV and NAVI control unit harness connector B29 terminal 28 (OR/L) and ground.
  1. Continuity should not exist.
OK or NG

OK >> GO TO 2.

NG >> Repair harness.
VEHICLE SPEED SIGNAL CHECK 1
1. Connect AV and NAVI control unit connector and combination meter connector.
2. Turn ignition switch ON.
3. Check voltage between AV and NAVI control unit harness connector B29 terminal 28 (OR/L) and ground.
  1. Approx. 3.5V or more
OK or NG

OK >> GO TO 3.

NG >> Replace AV and NAVI control unit

Fig 2: Checking Voltage Between B29 Terminal 28 (Or/L) & Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
VEHICLE SPEED SIGNAL CHECK 2
1. Drive vehicle at a constant speed.
2. Check the signal between AV and NAVI control unit harness connector B29 terminal 28 (OR/L) and ground with CONSULT-II or oscilloscope.
  1. 28 (OR/L) - Ground : Refer to " TERMINALS AND REFERENCE VALUE FOR AV AND NAVI CONTROL UNIT " .
OK or NG

OK >> Replace AV and NAVI control unit.

NG >> Check combination meter system, refer to "INSPECTION/VEHICLE SPEED SIGNAL ".

Fig 3: Checking Signal Between B29 Terminal 28 (Or/L) & Ground
Courtesy of NISSAN MOTOR CO., U.S.A.