Diagnosis Procedure 1

NATS (Nissan Anti-Theft System)

Diagnosis Procedure 1

Self-diagnostic results:
"CHAIN OF ECM-IMMU" displayed on CONSULT screen
First perform the "SELF-DIAG RESULTS" in "BCM" with CONSULT, then perform the trouble diagnosis of malfunction system indicated "SELF-DIAG RESULTS" of "BCM". CAN Communication Inspection Using CONSULT (Self-Diagnosis).

1. CONFIRM SELF-DIAGNOSTIC RESULTS

Confirm SELF-DIAGNOSTIC RESULTS "CHAIN OF ECM-IMMU" displayed on CONSULT 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 screen displayed as shown above [P1612]?
Yes- GO TO 2.
No- GO TO Trouble Diagnosis.

2. CHECK POWER SUPPLY CIRCUIT FOR BCM

1.Turn ignition switch OFF.
2.Check voltage between BCM and ground with CONSULT or tester.










OK or NG
OK- GO TO 3.
NG-Check the following.
- 50A fusible link (letter j, located in the fuse and fusible link box).
- 10A fuse [No.21, located in the fuse block (J/B)].
- Harness for open or short between fusible link and BCM.
- Harness for open or short between fuse and BCM.

3. CHECK IGNITION SWITCH ON SIGNAL

1.Turn ignition switch ON.
2.Check voltage between BCM connector and ground with CONSULT or tester.










OK or NG
OK- GO TO 4.
NG-Check the following.
- 10A fuse [No. 12, located in the fuse block (J/B)].
- Harness for open or short between fuse and BCM.

4. CHECK GROUND CIRCUIT FOR BCM

1.Turn ignition switch OFF.
2.Disconnect BCM connector.
3.Check continuity between BCM connector and ground.










OK or NG
OK- GO TO 5.
NG- Repair or replace harness.

5. REPLACE BCM

1.Replace BCM.
2.Perform initialization with CONSULT.
For initialization, refer to "CONSULT Operation Manual".
Does the engine start?
Yes-BCM is malfunctioning.
- Replace BCM. Service and Repair.
- Perform initialization with CONSULT
- For initialization, refer to "CONSULT Operation Manual"
No-ECM is malfunctioning.
- Replace ECM.
- Perform initialization or re-communicating function
- For initialization, refer to "CONSULT Operation Manual"
- For re-communicating function, ECM Re-Communicating Function