Diagnosis Procedure
Regarding Wiring Diagram information, refer to BCS "Wiring Diagram".
1.CHECK FUSES AND FUSIBLE LINK
Check that the following fuses and fusible link are not blown. 
Is the fuse blown?
YES >> Replace the blown fuse or fusible link after repairing the affected circuit.
NO >> GO TO 2.
2.CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM connectors.
3. Check voltage between BCM connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector.
3.CHECK GROUND CIRCUIT
Check continuity between BCM connector and ground. 
Is the inspection result normal?
YES >> Inspection End.
NO >> Repair harness or connector.
B2196 Dongle unitDescription BCM performs ID verification between BCM and dongle unit. When verification result is OK, BCM permits cranking. ...

Description Vehicle security indicator is built in combination meter. NATS (Nissan Anti-Theft System) condition is indicated by blink or illumination of vehicle security indicator. ...
P1148 closed loop control
DTC Logic
DTC DETECTION LOGIC
NOTE:
DTC P1148 is displayed with DTC for A/F sensor 1.
When the DTC is detected, perform the trouble diagnosis of DTC corresponding to
A/F sensor 1.
DTC No.
Trouble diagnosis
(Trouble diagnosis content)
DTC detecting condition
Possible cause ...
Performance test
Inspection
INSPECTION PROCEDURE
Connect recovery/recycling/recharging equipment (for HFC-134a) or
manifold gauge.
Start the engine, and set to the following condition.
Test condition &n ...