2. Check ECM Communication Circuit

WARNING: This page is about a different car, the 2004 Infiniti M45 and 2003 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect ASCD control unit connector and ECM connector.
Check continuity between ASCD control unit harness connector M35 terminal 7 (OR/B) and ECM harness connector F101 terminal 39 (OR/B).
7 - 39 : Continuity should exists
Check continuity between ASCD control unit harness connector M35 terminal 7 (OR/B) and ground.
7 - ground : Continuity should not exist

OK or NG

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

Fig 1: Checking ECM Communication Circuit

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