Without CONSULT-II

1. Turn ignition switch ON.
2. Check voltage between ECM terminal 99 and ground with pressing each button.

1. OK: GO TO 7 .
2. NG: GO TO 2.

Fig 1: Check Each Item Indication Under The Following Conditions

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OK or NG 

Fig 2: Check Voltage

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