Speed Signal Circuit Check

WARNING: This page is about a different car, the 2005 Nissan 350Z. However, it is still accessible from the selected car via links, so may be relevant.

First perform the "SELF-DIAG RESULT" in "BCM" with CONSULT-II, then perform the each trouble diagnosis of malfunction system indicated "SELF-DIAG RESULT" of "BCM". Refer to "CONSULT-II FUNCTION (BCM) ".

CHECK VEHICLE SPEED SIGNAL
1. Start engine.
2. Check the signal between Soft Top Control Unit Connector and ground.
Fig 1: Vehicle Speed Signal Soft Top Control Unit Connector Terminals 14 (W), 23 (W/G) & Ground Specifications Table
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: Checking Signal Between Soft Top Control Unit Connector Terminals 14 (W), 23 (W/G) & Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
- OK: Replace soft top control unit.
- NG: GO TO 2.
CHECK VEHICLE SPEED SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect soft top control unit and unified meter and A/C amp connector.
3. Check the following.
  - Continuity between Soft Top Control Unit Connector B66 terminal 14 and unified meter and A/C amp connector M49 terminal 26.
    - 14 (W) - 26 (W): Continuity should exist.
  - Continuity between Soft Top Control Unit Connector B66 terminal 14 and ground.
    - 14 (W) - Ground: Continuity should not exist.
  Fig 3: Soft Top Control Unit Connector B66 Terminal 14 & Unified Meter & A/C AMP Connector M49 Terminal 26 & Ground Continuity Test
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check the following.
  - Continuity between Soft Top Control Unit Connector B67 terminal 23 and unified meter and A/C amp connector M49 terminal 34.
    - 23 (W/G) - 34 (W/G): Continuity should exist.
  - Continuity between Soft Top Control Unit Connector B67 terminal 23 and ground.
    - 23 (W/G) - Ground: Continuity should not exist.
Fig 4: Soft Top Control Unit Connector B67 Terminal 23 & Unified Meter & A/C AMP Connector M49 Terminal 34 & Ground Continuity Test
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
- OK: Check unified meter and A/C amp. Refer to "SYSTEM DESCRIPTION ".
- NG: Repair or replace harness.