Page 809 of 3502
NATS(NISSAN ANTI-THEFT SYSTEM)
BL-151
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Diagnosis ProcedureBIS000YK
WORK FLOW
PIIB1052E
Page 810 of 3502

BL-152
NATS(NISSAN ANTI-THEFT SYSTEM)
Trouble Diagnosis Symptom ChartBIS000YL
*: When NATS detects trouble, the security indicator lights up while electronic key is in the “ON” position.
Security Indicator InspectionBIS000YM
*: CONSULT-II self-diagnostic results display screen “no malfunction is detected”.SYMPTOMDisplayed “SELF-DIAG
RESULTS” on CON-
SULT-II screen.DIAGNOSTIC PROCE-
DURESYSTEM (Malfunctioning part or mode)
Security indicator
lighting up*
Engine hard to startCHAIN OF ECM-IMMU
[P1612]Refer to BL-153, "
Diag-
nostic Procedure 1" .Open circuit in battery voltage line of BCM (NATS
IMMU) circuit
Open circuit in ignition line of BCM circuit
Open circuit in ground line of BCM circuit
Open or short circuit between BCM and ECM com-
munication line.
ECM
BCM
DIFFERENCE OF KEY
[P1615]Refer to BL-154, "
Diag-
nostic Procedure 2" .Unregistered key
BCM
CHAIN OF IMMU-KEY
[P1614]Refer to BL-157, "
Diag-
nostic Procedure 5" .Open or short circuit between BCM and NATS
antenna amp.
Malfunction of key ID chip
BCM
NATS antenna amp
ID DISCORD, IMM-ECM
[P1611]Refer to BL-155, "
Diag-
nostic Procedure 3" .System initialization has not yet been completed.
ECM
LOCK MODE
[P1610]Refer to BL-156, "
Diag-
nostic Procedure 4" .LOCK MODE
MIL staying ON
Security indicator
lighting up*DON'T ERASE
BEFORE CHECKING
ENG DIAGRefer to BL-151, "WORK FLOW" .Engine trouble data and NATS trouble data have
been detected in ECM
SYMPTOMSYSTEM
(Malfunctioning part or mode)DIAGNOSTIC PROCEDURE
Security indicator does not operate*Security indicator
Refer to BL-159, "
Diagnostic
Procedure 6" . Open circuit between Fuse and BCM (NATS
IMMU)
Continuation of initialization mode
BCM (NATS IMMU)
Page 811 of 3502

NATS(NISSAN ANTI-THEFT SYSTEM)
BL-153
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Diagnostic Procedure 1BIS000YN
Self-diagnostic results:
“CHAIN OF ECM-IMMU” display on CONSULT-II screen
First perform the “SELF-DIAG RESULTS” in “BCM” with CONSULT-II, then perform the trouble diagno-
sis of malfunction system indicated “SELF-DIAG RESULTS” of “BCM”. Refer to BCS-14, "
CAN Com-
munication Inspection Using CONSULT-II (Self-Diagnosis)" .
1. CHECK SELF-DIAGNOSTIC RESULTS
Check SELF-DIAGNOSTIC RESULTS “CHAIN OF ECM-IMMU” dis-
played on the screen?
Is CONSULT-II screen displayed as above?
YES >> GO TO 2.
NO >> GO TO BL-152, "
Trouble Diagnosis Symptom Chart" .
2. CHECK POWER SUPPLY CIRCUIT FOR BCM
1. Turn ignition switch OFF.
2. Disconnect BCM connector.
3. Check voltage between BCM connector M4 terminal 42 (Y/R),
55 (W/B) and ground.
OK or NG
OK >> GO TO 3.
NG >> Check the following.
50A fusible link [Letter M , located in fuse block (J/B)]
15A fuse [No.17, located in fuse block (J/B)]
Harness for open or short between fusible link or fuse
and BCM.
3. CHECK IGNITION SWITCH ON SIGNAL
1. Turn ignition switch ON.
2. Check voltage between BCM connector M3 terminal 38 (R) and
ground.
OK or NG
OK >> GO TO 4.
NG >> Check the following.
10A fuse [No.1, located in fuse block (J/B)]
Harness for open or short between fuse and BCM.
PIIA1260E
42 (Y/R) – Ground : Battery voltage
55 (W/B) – Ground : Battery voltage
PIIA6143E
38 (R) – Ground : Battery voltage
PIIA6144E
Page 812 of 3502

BL-154
NATS(NISSAN ANTI-THEFT SYSTEM)
4. CHECK GROUND CIRCUIT FOR BCM
1. Turn ignition switch OFF.
2. Check continuity between BCM connector M4 terminal 52 (B) and ground.
OK or NG
OK >> GO TO 5.
NG >> Repair or replace harness between BCM and ground.
5. REPLACE BCM
1. Replace BCM.
2. Perform initialization with CONSULT-II.
For initialization, refer to “CONSULT-II Operation Manual NATS”.
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-II Operation Manual NATS”.
–For re-communicating function, refer to BL-142, "ECM Re-Communicating Function" .
Diagnostic Procedure 2BIS000YO
Self-diagnostic results:
“DIFFERENCE OF KEY” displayed on CONSULT-II screen
1. CHECK SELF-DIAGNOSTIC RESULTS
Check SELF-DIAGNOSTIC RESULTS “DIFFERENCE OF KEY” dis-
played on CONSULT-II screen.
Is CONSULT-II screen displayed as above?
Yes >> GO TO 2.
No >> GO TO BL-152, "
Trouble Diagnosis Symptom Chart" . 52 (B) - Ground : Continuity should exist.
PIIB1054E
PIIA1261E
Page 813 of 3502

NATS(NISSAN ANTI-THEFT SYSTEM)
BL-155
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2. PERFORM INITIALIZATION WITH CONSULT-II
Perform initialization with CONSULT-II. Re-register all ignition key or mechanical key IDs.
For initialization and registration of ignition key or mechanical key IDs, refer to “CONSULT-II Operation Manual
NATS”.
NOTE:
If the initialization is not completed or malfunctions, CONSULT-II
shows message on the screen.
Can the system be initialized and can the engine be started with re-
registered ignition key or mechanical key?
Ye s > >Ignition key ID was unregistered.
No >> BCM is malfunctioning.
Replace BCM.
Perform initialization with CONSULT-II.
For initialization, refer to “CONSULT-II Operation
Manual NATS”.
Diagnostic Procedure 3BIS000YP
Self-diagnostic results:
“ID DISCORD, IMM-ECM” displayed on CONSULT-II screen
1. CHECK SELF-DIAGNOSTIC RESULTS
Check SELF-DIAGNOSTIC RESULTS “ID DISCORD, IMM-ECM” displayed on CONSULT-II screen.
NOTE:
“ID DISCORD IMM-ECM”:
Registered ID of BCM is in discord with that of ECM.
Is CONSULT-II screen displayed as above?
Ye s > > G O T O 2 .
No >> GO TO BL-152, "
Trouble Diagnosis Symptom Chart" .
2. PERFORM INITIALIZATION WITH CONSULT-II
Perform initialization with CONSULT-II. Re-register all ignition key or mechanical key IDs.
For initialization, refer to “CONSULT-II Operation Manual NATS”.
NOTE:
If the initialization is not completed or malfunctions, CONSULT-II
shows message on the screen.
Can the system be initialized?
Yes >> Start engine. (END)
System initialization had not been completed.
No >> ECM is malfunctioning.
Replace ECM.
Perform initialization or re-communicating function.
–For initialization, refer to “CONSULT-II Operation Manual NATS”.
–For re-communicating function, refer to BL-142, "ECM Re-Communicating Function" .
SEL297W
PIIA1262E
SEL297W
Page 814 of 3502

BL-156
NATS(NISSAN ANTI-THEFT SYSTEM)
Diagnostic Procedure 4BIS000YQ
Self-diagnostic results:
“LOCK MODE” displayed on CONSULT-II screen
1. CHECK SELF-DIAGNOSTIC RESULTS
Check SELF-DIAGNOSTIC RESULTS “LOCK MODE” is displayed
on CONSULT-II screen.
Is CONSULT-II screen displayed as above?
Yes >> GO TO 2.
No >> GO TO BL-152, "
Trouble Diagnosis Symptom Chart" .
2. ESCAPE FROM LOCK MODE
1. Turn ignition switch OFF.
2. Turn ignition switch ON with registered key. (Do not start engine.) Wait 5 seconds.
3. Return the key to OFF position. Wait 5 seconds.
4. Repeat steps 2 and 3 twice (total of three cycles).
5. Start the engine.
Does engine start?
Yes >> System is OK (Now system is escaped from “LOCK MODE”).
No >> GO TO 3.
3. PERFORM INITIALIZATION WITH CONSULT-II
Perform initialization with CONSULT-II.
For initialization, refer to “CONSULT-II Operation Manual NATS”.
NOTE:
If the initialization is not completed or malfunctions, CONSULT-II
shows the message on the screen.
Can the system be initialized?
Ye s > > S y s t e m i s O K .
No >> GO TO 4
PIIA1264E
SEL297W
Page 815 of 3502

NATS(NISSAN ANTI-THEFT SYSTEM)
BL-157
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4. PERFORM INITIALIZATION WITH CONSULT-II AGAIN
1. Replace BCM.
2. Perform initialization with CONSULT-II.
For initialization, refer to “CONSULT-II Operation Manual
NATS”.
NOTE:
If the initialization is not completed or malfunctions, CONSULT-II
shows the message on the screen.
Can the system be initialized?
Yes >> System is OK. BCM is malfunctioning.
No >> ECM is malfunctioning.
Replace ECM.
Perform initialization or re-communicating function.
–For initialization, refer to “CONSULT-II Operation
Manual NATS”.
–For re-communicating function, refer to BL-142, "ECM Re-Communicating Function" .
Diagnostic Procedure 5BIS000YR
Self-diagnostic results:
“CHAIN OF IMMU-KEY” displayed on CONSULT-II screen
1. CHECK SELF-DIAGNOSTIC RESULTS
Check self-diagnostic results “CHAIN OF IMMU-KEY” displayed on CONSULT-II screen.
Is CONSULT-II screen displayed as above?
Ye s > > G O T O 2 .
No >> GO TO BL-152, "
Trouble Diagnosis Symptom Chart" .
2. CHECK NATS ANTENNA AMP. INSTALLATION
Check NATS antenna amp. installation. Refer to BL-160, "
Removal and Installation NATS Antenna Amp." .
OK or NG
OK >> GO TO 3.
NG >> Reinstall NATS antenna amp. correctly.
3. CHECK KEY ID CHIP
Start engine with another registered ignition key or mechanical key.
Does the engine start?
Yes >> Ignition key or mechanical key ID chip is malfunctioning.
Replace the ignition key or mechanical key.
Perform initialization with CONSULT-II.
For initialization, refer to “CONSULT-II Operation Manual NATS–IVIS/NVIS”.
No >> GO TO 4.
SEL297W
Page 816 of 3502

BL-158
NATS(NISSAN ANTI-THEFT SYSTEM)
4. CHECK POWER SUPPLY FOR NATS ANTENNA AMP.
Check voltage between NATS antenna amp. connector M22 terminal 1 (W/L) and ground with CONSULT-II or
tester.
OK or NG
OK >> GO TO 5.
NG >> Check harness for open or short between NATS
antenna amp. and fuse.
5. CHECK NATS ANTENNA AMP. SIGNAL LINE- 1
Check voltage between NATS antenna amp. connector M22 terminal 2 (P/L) and ground with analogue tester.
OK or NG
OK >> GO TO 6.
NG >>
Check harness for open or short between NATS
antenna amp. and BCM.
NOTE:
If harness is OK, replace BCM, perform initialization
with CONSULT-II. For initialization, refer to “CONSULT-II Operation Manual NATS–IVIS/NVIS”.
6. CHECK NATS ANTENNA AMP. SIGNAL LINE- 2
Check voltage between NATS antenna amp. connector M22 terminal 4 (LG) and ground with analogue tester.
OK or NG
OK >> GO TO 7.
NG >>
Check harness for open or short between NATS
antenna amp. and BCM.
NOTE:
If harness is OK, replace BCM, perform initialization
with CONSULT-II. For initialization, refer to “CONSULT-II Operation Manual NATS–IVIS/NVIS”. 1 (W/L) – Ground : Battery voltage
PIIA6145E
Before inserting mechanical key in ignition knob
Voltage: 0V
Just after inserting mechanical key in ignition knob
: Pointer of tester should move.
PIIA6146E
Before inserting mechanical key in ignition knob
Voltage: 0V
Just after inserting mechanical key in ignition knob
: Pointer of tester should move.
PIIA6147E