3. Check BCM Input Signal

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

With CONSULT-II

With "DATA MONITOR" of "BUZZER", confirm "KEY ON SW" changes when the key is inserted/removed form the ignition key cylinder.

When key is inserted in ignition key cylinder : KEY ON SW ON
When key is removed from ignition key cylinder : KEY ON SW OFF

Fig 1: Consult II Display

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

Without CONSULT-II

Check voltage between BCM harness connector M18 terminal 37 (B/R) and ground.

When key is inserted in ignition key cylinder : Approx. 12V
When key is removed from ignition key cylinder : Approx. 0V

OK or NG

OK >> Replace the BCM. Refer to REMOVAL AND INSTALLATION OF BCM .

NG >> GO TO 4.

Fig 2: Identifying BCM Connector Test Terminal

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