Diagnosis Procedure 1

NVIS(NISSAN VEHICLE IMMOBILIZER SYSTEM-NATS)


Diagnosis Procedure 1

Self-diagnostic results:
"CHAIN OF ECM-IMMU" displayed on CONSULT-III screen
First perform the "SELF-DIAG RESULTS" in "BCM" with CONSULT-III, then perform the trouble diagnosis of malfunction system indicated "SELF-DIAG RESULTS" of "BCM". Refer to NVIS (Nissan Vehicle Immobilizer System-NATS)
1.CONFIRM SELF-DIAGNOSTIC RESULTS
Confirm SELF-DIAGNOSTIC RESULTS "CHAIN OF ECM-IMMU" displayed on CONSULT-III screen.

NOTE:
In rare case, "CHAIN OF ECM-IMMU" might be stored during key registration procedure, even if the system is not malfunctioning.
Is CONSULT-III screen displayed as above?
Yes - GO TO 2.
No - GO TO Trouble Diagnosis.
2.CHECK POWER SUPPLY CIRCUIT FOR BCM
1. Turn ignition switch OFF.
2. Disconnect BCM.
3. Check voltage between BCM connector M20 terminal 70 and ground.






70 - Ground : Battery voltage

OK or NG
OK - GO TO 3.
NG - Check the following:
- 50A fusible link (letter j, located in fuse and fusible link box).
- Harness for open or short between fuse and BCM connector.
3.CHECK IGN SW. ON SIGNAL
1. Turn ignition switch ON.
2. Check voltage between BCM connector M18 terminal 38 and ground.






38 - Ground : Battery voltage


OK or NG
OK - GO TO 4.
NG - Check the following:
- 10A fuse [No. 16, located in the fuse block (J/B)].
- Harness for open or short between fuse and BCM connector.
4.CHECK GROUND CIRCUIT FOR BCM
1. Turn ignition switch OFF.
2. Check continuity between BCM connector M20 terminal 67 and ground.






67 - Ground : Continuity should exist.

OK or NG
OK - GO TO 5.
NG - Repair or replace harness.
5.REPLACE BCM
1. Replace BCM. Refer to Service and Repair.
2. Perform initialization with CONSULT-III.
For initialization, refer to "CONSULT-III Operation Manual.
Does the engine start?
Yes - BCM is malfunctioning.
No - ECM is malfunctioning.
- Replace ECM.
- Perform initialization or re-communicating function.
- For initialization, refer to CONSULT-III Operation Manual.
- For re-communicating function, refer to Programming and Relearning.