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NATS (NISSAN ANTI-THEFT SYSTEM)
BL-215
< SERVICE INFORMATION >
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Trouble Diagnosis ProcedureINFOID:0000000001704110
PRELIMINARY CHECK
1.GET SYMPTOMS
Listen to customer complaints request. (Get symptoms)
NOTE:
If customer reports a “No start” condition, request all Intelligent Keys to be brought to the dealer in case of
Intelligent Key system malfunction.
Intelligent Key or mechanical key service request>> For further information, refer to CONSULT-III operation
manual.
Malfunctions>>GO TO 2.
2.START ENGINE WITH INTELLIGENT KEY (IF EQUIPPED)
Check if the engine could be started by all registered Intelligent Keys.
The engine cannot be started by some Intelligent Keys>>Intelligent Key is low battery or malfunction. Refer
to BL-142, "
Intelligent Key Battery Replacement" .
The engine cannot be started by all Intelligent Keys>>GO TO 3.
The engine can be started by all Intelligent Keys>>GO TO 4.
3.CHECK “KEY” WARNING LAMP ILLUMINATION
When pushing the ignition switch, check if “KEY” warning lamp in combination meter illuminates.
KEY warning lamp illuminates green>>GO TO BL-103, "
Trouble Diagnosis Symptom Chart" .
KEY warning lamp illuminates red>>GO TO BL-103, "
Trouble Diagnosis Symptom Chart" .
Does not illuminate>>GO TO BL-103, "
Trouble Diagnosis Symptom Chart" .
4.START ENGINE WITH MECHANICAL KEY
Check if the engine could be started by all registered mechanical keys.
The engine can not be started by some mechanical keys>>Register mechanical key. Refer to CONSULT-III
operation manual.
The engine cannot be started by all mechanical keys>> "WORK FLOW" .
The engine can be started by all mechanical keys>>GO TO 5.
5.PERFORM SELF-DIAGNOSIS
1. Turn ignition switch to ON by carrying the Intelligent Key.
2. Perform self-diagnosis of Intelligent Key system with CONSULT-III.
Malfunction is detected>>GO TO BL-101, "
CONSULT-III Application Item" .
No malfunction is detected>>GO TO BL-99, "
Trouble Diagnosis Procedure" .
WORK FLOW
LOCK MODE
[P1610]NATS MAL-
FUNCTION
P1610When the starting operation is carried out five or more
times consecutively under the following conditions, NATS
will shift the mode to one which prevents the engine from
being started.
• Unregistered mechanical key is used.
• BCM or ECM’s malfunctioning.BL-223
DON'T ERASE BEFORE CHECK-
ING ENG DIAG—All engine trouble codes except NATS trouble code has
been detected in ECM.BL-215
Detected items
[NATS program card screen terms]P No. Code
(Self-diagnostic
result of “EN-
GINE”)Malfunction is detected when.....Reference
page
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BL-216
< SERVICE INFORMATION >
NATS (NISSAN ANTI-THEFT SYSTEM)
1.STARTING ENGINE
Check if the engine could be started by inserting the mechanical key into the ignition key cylinder and operate
ignition switch.
OK >> System is normal.
NG >> GO TO 2.
2.PERFORM SELF DIAGNOSIS
Perform SELF-DIAGNOSIS “NATS V5.0” using CONSULT-III.
NOTE:
NATS program card is necessary to display the “SELF-DIAGNOSIS”.
No malfunction is detected>>Recheck the starting engine section GO TO 1.
Malfunction related to NATS is detected>>GO TO 3.
Malfunctions related to “DON’T ERASE BEFORE CHECKING ENG DIAG” and NATS are detected>>GO
TO 7.
3.IDENTIFYING NATS MALFUNCTION
Self-diagnosis results referring to NATS, but no information about engine self-diagnosis result is displayed on
CONSULT-III. Refer to BL-217, "
Trouble Diagnosis" .
>> GO TO 4.
4.NATS TROUBLE DIAGNOSIS
Repair NATS (if necessary, perform “C/U INITIALIZATION” with CONSULT-III.)
>> GO TO 5.
5.ERASE SELF-DIAGNOSIS
Erase the record of “SELF-DIAGNOSIS” by using CONSULT-III.
>> GO TO 6.
6.STARTING ENGINE
Check if the engine could be started by inserting the mechanical key into the ignition key cylinder and operate
ignition switch.
NG >> GO TO 2.
OK >> End of inspection.
7.IDENTIFYING NATS AND ENGINE CONTROL MALFUNCTION
NATS malfunction and “DON’T ERASE BEFORE CHECKING ENG DIAG” are displayed on the CONSULT-III
screen.
NOTE:
This indication means that malfunction have been detected in NATS and engine control system.
>> GO TO 8.
8.NATS TROUBLE DIAGNOSIS
Repair NATS according to self-diagnosis results refer to NATS (if necessary, perform “C/U INITIALZATIN” with
CONSULT-III.)
NOTE:
Do not erase “SELF-DIAGNOSIS” by using CONSULT-III.
>> GO TO 9.
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NATS (NISSAN ANTI-THEFT SYSTEM)
BL-217
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9.IDENTIFYING ENGINE CONTROL MALFUNCTION
Check engine “SELF-DIAGNOSIS” records with a generalized program card instead of the NATS program
card.
>> GO TO 10.
10.ENGINE CONTROL SYSTEM TROUBLE DIAGNOSIS
Repair engine control system if engine related malfunction is detected.
With engine diagnostic codes present, refer to EC-9
.
Without engine diagnostic codes present, refer to EC-81
.
NOTE:
If only “NATS MALFUNCTION” is displayed, erase the self-diagnosis results.
>> GO TO 11.
11 .STARTING ENGINE
Check if the engine could be started by inserting the mechanical key into the ignition key cylinder and operate
ignition switch.
OK >> GO TO 12.
NG >> GO TO 2.
12.ERASE SELF-DIAGNOSIS
Erase both NATS and ENGINE "SELF-DIAGNOSIS" records by using CONSULT-III NATS program card and
generalized program card.
>> GO TO 13
13.COMFIRMATION
Perform running test with CONSULT-III in engine “SELF-DIAGNOSIS” mode.
“NO DTC” is displayed>> End of inspection.
Malfunction information is displayed>>GO TO 2.
Trouble DiagnosisINFOID:0000000001704111
SYMPTOM MATRIX CHART 1
Page 652 of 2771

BL-218
< SERVICE INFORMATION >
NATS (NISSAN ANTI-THEFT SYSTEM)
Self-diagnosis related item
• *: When NATS detects trouble, the security indicator lights up while ignition key is in the “ON” position.
SYMPTOM MATRIX CHART 2
Non self-diagnosis related item
*: CONSULT-III self-diagnostic results display screen “no malfunction is detected”.
Diagnosis Procedure 1INFOID:0000000001704112
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 diag-
nosis of malfunction system indicated “SELF-DIAG RESULTS” of “BCM”. Refer to BCS-17, "
CAN Com-
munication Inspection Using CONSULT-III (Self-Diagnosis)" .
1.CONFIRM SELF-DIAGNOSTIC RESULTS
Confirm SELF-DIAGNOSTIC RESULTS “CHAIN OF ECM-IMMU” displayed on CONSULT-III screen.
NOTE:
SYMPTOMDisplayed “SELF-DIAG
RESULTS” on CON-
SULT-III screen.DIAGNOSTIC PROCE-
DURE
(Reference page)SYSTEM
(Malfunctioning part or mode)
• Security indicator
lighting up*
• Engine cannot be
startedCHAIN OF ECM-IMMU
[P1612]PROCEDURE 1
(BL-218
)In rare case, “CHAIN OF ECM-IMMU” might be stored
during key registration procedure, even if the system is
not malfunctioning.
Open circuit in battery voltage line of BCM 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 commu-
nication line
ECM
BCM
CHAIN OF IMMU-KEY
[P1614]PROCEDURE 2
(BL-220
)Malfunction of key ID chip
Communication line between ANT/ AMP and BCM:
Open circuit or short circuit of battery voltage line or
ground line
Open circuit in power source line of ANT/ AMP circuit
Open circuit in ground line of ANT/ AMP circuit
NATS antenna amp.
BCM
ID DISCORD, IMM-
ECM
[P1611]PROCEDURE 3
(BL-221
)System initialization has not yet been completed.
ECM
LOCK MODE
[P1610]PROCEDURE 5
(BL-223
)When the starting operation is carried out five or more
times consecutively under the following conditions,
NATS will shift the mode to one which prevents the en-
gine from being started.
• Unregistered ignition key is used.
• BCM or ECM’s malfunctioning.
Security indicator
lighting up*DON'T ERASE BE-
FORE CHECKING
ENG DIAGWORK FLOW
(BL-215
)Engine trouble data and NATS trouble data have been
detected in ECM
SYMPTOMDIAGNOSTIC PROCEDURE
(Reference page)SYSTEM
(Malfunctioning part or mode)
Security indicator does not light up*.PROCEDURE 4
(BL-222
)Security indictor.
Open circuit between Fuse and BCM
BCM
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NATS (NISSAN ANTI-THEFT SYSTEM)
BL-219
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In rare case, “CHAIN OF ECM-IMMU” might be stored during key registration procedure, even if the system is
not malfunctioning.
Is
“CHAIN OF ECM-IMMU” displayed?
Yes >> GO TO 2.
No >> GO TO BL-217, "
Trouble Diagnosis" .
2.CHECK POWER SUPPLY CIRCUIT FOR BCM
1. Turn ignition switch OFF.
2. Check voltage between BCM and ground with CONSULT-III or tester.
OK or NG
OK >> GO TO 3.
NG >> Check the following.
• 40A fusible link (letter g , located in the fuse and fus-
ible link box).
• 10A fuse [No.8, 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-III or tester.
OK or NG
OK >> GO TO 4.
NG >> Check the following.
• 10A fuse [No. 6, 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-III.
BCM connectorTe r m i n a l s
Voltage [V]
(Approx.)
(+) (–)
M2057
Ground Battery voltage
70
PIIB6582E
BCM connectorTerminal
Voltage [V]
(Approx.)
(+) (–)
M18 38 Ground Battery voltage
PIIB6587E
BCM connectorTerminal
Continuity
(+) (–)
M20 67 Ground Yes
PIIB6588E
Page 654 of 2771

BL-220
< SERVICE INFORMATION >
NATS (NISSAN ANTI-THEFT SYSTEM)
For initialization, refer to “CONSULT-III Operation Manual NATS”.
Does the engine start?
Yes >> BCM is malfunctioning.
• Replace BCM. Refer to BCS-18, "
Removal and Installation of BCM" .
• Perform initialization with CONSULT-III
• For initialization, refer to “CONSULT-III Operation Manual NATS”
No >> ECM is malfunctioning.
• Replace ECM.
• Perform initialization or re-communicating function
• For initialization, refer to “CONSULT-III Operation Manual NATS”
• For re-communicating function, refer to BL-211, "
ECM Re-communicating Function"
Diagnosis Procedure 2INFOID:0000000001704113
Self-diagnostic results:
“CHAIN OF IMMU-KEY” displayed on CONSULT-III screen
1.CONFIRM SELF-DIAGNOSTIC RESULTS
Confirm SELF-DIAGNOSTIC RESULTS “CHAIN OF IMMU-KEY” displayed on CONSULT-III screen.
Is
“CHAIN OF IMMU-KEY” displayed?
Ye s > > G O T O 2 .
No >> GO TO BL-217, "
Trouble Diagnosis" .
2.CHECK NATS ANTENNA AMP. INSTALLATION
Check NATS antenna amp. installation. Refer to BL-224, "
How to Replace NATS Antenna Amp" .
OK or NG
OK >> GO TO 3.
NG >> Reinstall NATS antenna amp. correctly.
3.CHECK NATS IGNITION KEY ID CHIP
Start engine with another registered NATS ignition key.
Does the engine start?
Yes >> Ignition key ID chip is malfunctioning.
• Replace the ignition key
• Perform initialization with CONSULT-III
For initialization, refer to “CONSULT-III Operation Manual NATS”
No >> GO TO 4.
4.CHECK POWER SUPPLY FOR NATS ANTENNA AMP.
1. Turn ignition switch “OFF”.
2. Check voltage between NATS antenna amp. connector and ground.
OK or NG
OK >> GO TO 5.
NG >> Check the following.
• 20A fuse [No. 53, located in IPDM E/R]
• Harness for open or short between fuse and NATS
antenna amp.
5.CHECK NATS ANTENNA AMP. SIGNAL LINE- 1
Check voltage between NATS antenna amp. connector and ground with analog tester.
NATS antenna amp.
connectorTe r m i n a l
Voltage [V]
(Approx.)
(+) (–)
M21 1 Ground Battery voltage
PIIB6589E
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NATS (NISSAN ANTI-THEFT SYSTEM)
BL-221
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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-III. For initialization, refer to
“CONSULT-III Operation Manual NATS”.
6.CHECK NATS ANTENNA AMP. SIGNAL LINE- 2
Check voltage between NATS antenna amp. connector and ground with analog 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-III. For initialization, refer to
“CONSULT-III Operation Manual NATS”.
7.CHECK NATS ANTENNA AMP. GROUND LINE CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect NATS antenna amp. connector.
3. Check continuity between NATS antenna amp. connector and ground.
OK or NG
OK >> NATS antenna amp. is malfunctioning, reinstall antenna
or replace it.
NG >> Repair or replace NATS antenna amp. ground circuit.
Diagnosis Procedure 3INFOID:0000000001704114
Self-diagnostic results:
“ID DISCORD, IMM-ECM” displayed on CONSULT-III screen
1.CONFIRM SELF-DIAGNOSTIC RESULTS
Confirm SELF-DIAGNOSTIC RESULTS “ID DISCORD, IMM-ECM” displayed on CONSULT-III screen.
NOTE:
NATS anten-
na amp.
connectorTe r m i n a l
ConditionsStatus of
Voltage and tester
(+) (–)
M21 2 GroundBefore tuning igni-
tion switch to ONApprox. 0 [V]
Right after tuning
ignition switch to
ONPointer of tester
should move
PIIB6590E
NATS anten-
na amp.
connectorTe r m i n a l
ConditionsStatus of
Voltage and tester
(+) (–)
M21 4 GroundBefore tuning igni-
tion switch to ONApprox. 0 [V]
Right after tuning
ignition switch to
ONPointer of tester
should move
PIIB6591E
NATS antenna amp.
connectorTe r m i n a l
Continuity
(+) (–)
M21 3 Ground Yes
PIIB6592E
Page 656 of 2771

BL-222
< SERVICE INFORMATION >
NATS (NISSAN ANTI-THEFT SYSTEM)
“ID DISCORD IMM-ECM”:
Registered ID of BCM is in discord with that of ECM.
Is
“ID DISCORD IMM-ECM” displayed?
Ye s > > G O T O 2 .
No >> GO TO BL-217, "
Trouble Diagnosis" .
2.PERFORM INITIALIZATION WITH CONSULT-III
Perform initialization with CONSULT-III. Re-register all NATS ignition key IDs.
For initialization, refer to “CONSULT-III Operation Manual NATS”.
NOTE:
If the initialization is not completed or malfunctions, CONSULT-III 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 with CONSULT-III
For initialization, refer to “CONSULT-III Operation Manual NATS”
Diagnosis Procedure 4INFOID:0000000001704115
“COMBINATION METER (SECURITY) DOES NOT LIGHT UP”
1.CHECK FUSE
Check 10A fuse [No.13, located in the fuse block (J/B)]
OK or NG
OK >> GO TO 2.
NG >> Replace fuse.
2.CHECK COMBINATION METER (SECURITY)
1. Install 10A fuse.
2. Start engine and turn ignition switch OFF.
3. Check if the combination meter (security) lights up.
OK or NG
OK >> INSPECTION END.
NG >> GO TO 3.
3.CHECK COMBINATION METER (SECURITY) POWER SUPPLY CIRCUIT
1. Disconnect combination meter (security) connector.
2. Check voltage between combination meter (security) connector and ground.
OK or NG
OK >> GO TO 4.
NG >> Check harness for open or short between fuse and com-
bination meter (security).
4.CHECK BCM FUNCTION
1. Connect combination meter (security) connector.
2. Disconnect BCM connector.
3. Check voltage between BCM connector and ground. Combination meter (security) should light up.
Combination meter
(security) connec-
torTe r m i n a l
Voltage [V]
(Approx.)
(+) (-)
M24 27 Ground Battery voltage
PIIB6593E