Vehicle Speed Signal Inspection

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.

CHECK HARNESS
1. Disconnect AV control unit and combination meter connector.
2. Check continuity between AV control unit harness connector M77 terminal 33 (OR/L) and ground.
3. Continuity should not exist.
4. Check continuity between AV control unit harness connector M77 terminal 33 (OR/L) and combination meter harness connector M41 terminal 37 (OR/L).
  1. Continuity should exist.
OK or NG

OK >> GO TO 2.

NG >>
- Check connector housings for disconnected or loose terminals.
- Repair harness or connector.
VEHICLE SPEED SIGNAL CHECK 1
1. Connect AV control unit connector.
2. Turn ignition switch ON.
3. Check voltage between AV control unit harness connector M77 terminal 33 (OR/L) and ground.
  1. Approx. 3.5V or more
OK or NG

OK >> GO TO 3.

NG >> Replace AV control unit.
VEHICLE SPEED SIGNAL CHECK 2
1. Connect combination meter connector.
2. Start engine and drive vehicle at more than 40km/h (25MPH).
3. Check signal between AV control unit harness connector M77 terminal 33 (OR/L) and ground.
  1. 33 (OR/L) - Ground : Refer to " TERMINALS AND REFERENCE VALUE FOR AV CONTROL UNIT " .
OK or NG

OK >> Replace AV control unit.

NG >> Check combination meter. Refer to "INSPECTION/VEHICLE SPEED SIGNAL ".