Until a Specialist replies...I pulled this from your Service Manual Section BL - BODY, LOCK & SECURITY SYSTEM
VEHICLE SECURITY SYSTEM DEACTIVATION - To deactivate the vehicle security system, a door must be unlocked or back door (for Coupe) or trunk (for Roadster) must be opened with the key or key fob. When the BCM receives either above signal or unlock signal from key fob, the vehicle security system is deactivated (Disarmed phase).
Now, according to NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM-NATS) - If customer reports a “No start” condition, request ALL KEYS to be brought to an NISSAN dealer in case of a NVIS (NATS) malfunction. The section goes on to say...
Your ECM isn't new - so don't do this! I just wanted you to see the procedure for information purposes only
ECM Re-communicating Function AIS00146 - Performing following procedure can automatically perform re-communication of ECM and BCM, but only when the ECM has been replaced with a new one (*1).
*1: New one means a virgin ECM which has never been energized on-board. (In this step, initialization procedure by CONSULT-II is not necessary)
NOTE:
When registering new Key IDs or replacing the ECM other than brand new, refer to CONSULT-II Operation Manual NATS-IVIS/NVIS.
If multiple keys are attached to the key holder, separate them before work.
Distinguish keys with unregistered key ID from those with registered ID.
1. Install ECM.
2. Using a registered key (*2), turn ignition switch to “ON”.
*2: To perform this step, use the key (except for card plate key) that has been used before performing ECM replacement.
3. Maintain ignition switch in “ON” position for at least 5 seconds.
4. Turn ignition switch to “OFF”.
5. Start engine.
If engine can be started, procedure is completed.
If engine cannot be started, refer to CONSULT-II Operation Manual NATS-IVIS/NVIS and initialize control unit.
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