engine NISSAN LATIO 2008 Service Repair Manual

INTELLIGENT KEY SYSTEM
BL-81
< SERVICE INFORMATION >
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When ignition switch turns to START position, BCM sends starter request signal to IPDM E/R. Then, engine
starts.
Even if Intelligent Key battery runs down, Intelligent key unit can start engine with mechanical key built Intelli-
gent Key. For details, refer toBL-210
.
All of the originally supplied Intelligent Key IDs (except for key) have been registered in Intelligent Key system.
If requested by the vehicle owner, a maximum of four Intelligent Key IDs can be registered into the Intelligent
Key system components.
List of Operation Related Parts
Parts marked with × are the parts related to operation.
WARNING CHIME/BUZZER/LAMPS FUNCTION
Operation Description
The following warning chime (combination meter), Intelligent Key warning buzzer (front door LH), Intelligent
Key warning buzzer (trunk)
*, warning lamps "KEY" and “P-SHIFT” (with CVT) or "LOCK" (with M/T) are given
to the user as warning information while using the intelligent key system.
• Ignition switch warning chime
• Ignition key warning chime
• OFF position warning chime
• Take away warning chime
• Door lock operation warning chime
• Intelligent key low battery warning
• P position warning (with CVT)
• LOCK position warning (with M/T)
NOTE:
For key-in-ignition warning chime related concerns only, refer to DI-41
.
* :
Sedan
Operation Condition
Engine start functions
Intelligent Key
Key switch
Ignition knob switch
Inside key antenna
Intelligent Key unit
CAN communication system
BCM
Combination meter
IPDM E/R
NATS antenna amp.
Steering lock solenoid
Engine start function by the Intelligent Key××××××××× ×
Engine start function by the mechanical key× ××× ×××
Operation ConditionWarning chime/buzzer Warning lamp
Chime
(combina-
tion meter)Buzzer(s) KEYLOCK
(M/T)P-SHIFT
(CVT)
Ignition switch warning chime• Mechanical key is out of ignition switch
(Key switch is OFF)
• Ignition switch is in the ACC, OFF or
LOCK position.
[ignition switch is pressed
(ignition knob switch is ON).]
• Driver door is open.activate — — — —
Ignition key warning chime
(When mechanical key is used)• Mechanical key is inserted in ignition
switch (key switch is ON).
• Ignition switch is in the ACC, OFF or
LOCK position.
• Driver door is open.activate — — — —

INTELLIGENT KEY SYSTEM
BL-99
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Terminal and Reference Value for BCMINFOID:0000000001704007
Refer to BCS-11, "Terminal and Reference Value for BCM".
Trouble Diagnosis ProcedureINFOID:0000000001704008
PRELIMINARY CHECK
1.GET SYMPTOMS
Listen to customer concerns. (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.CHECK BCM CONFIGURATION
Confirm BCM configuration for "I-KEY" is set to "WITH". Refer to BCS-17, "
Configuration".
OK or NG
OK >> GO TO 3.
NG >> Change BCM configuration for "I-KEY" to "WITH". Refer to BCS-17, "
Configuration".
3.START ENGINE WITH INTELLIGENT KEY
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 4.
The engine can be started by all Intelligent Keys>>GO TO 5.
4.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".
5.START ENGINE WITH MECHANICAL KEY
Check if the engine could be started by all registered mechanical keys.
No start by some mechanical keys>>Register mechanical key. Refer to CONSULT-III operation manual.
Engine starts by mechanical or Intelligent Key>>GO TO BL-103, "
Trouble Diagnosis Symptom Chart".
No start by mechanical key or Intelligent Key>>GO TO NATS BL-215, "
Trouble Diagnosis Procedure".
Engine starts with Intelligent Key or mechanical key>>GO TO "WORK FLOW".
The engine can be started by all mechanical keys>>GO TO 6.
6.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.
DTC is displayed>>GO TO BL-101, "
CONSULT-III Application Item".
DTC is not displayed>>GO TO BL-103, "
Trouble Diagnosis Symptom Chart".
WORK FLOW
Before performing the work flow, carry out preliminary check. Refer to "PRELIMINARY CHECK".

INTELLIGENT KEY SYSTEM
BL-103
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Trouble Diagnosis Symptom ChartINFOID:0000000001704012
KEY WARNING LAMP (GREEN) ILLUMINATES
NOTE:
• Before performing the diagnosis in the following table, check “Trouble Diagnosis Procedure”. Refer to BL-99,
"Trouble Diagnosis Procedure".
• Make sure that vehicle is under the condition shown in “Conditions of vehicle” before starting diagnosis, and
check each symptom.
• If the following “symptoms” are detected, check systems shown in the “Diagnoses/service procedure” col-
umn in this order.
Conditions of Vehicle (Operating Conditions)
• Intelligent Key is registered.
• Key is not inserted in ignition switch.
• One or more registered Intelligent Keys are in the vehicle.
KEY WARNING LAMP (RED) ILLUMINATES
NOTE:
• Before performing the diagnosis in the following table, check “Trouble Diagnosis Procedure”. Refer to BL-99,
"Trouble Diagnosis Procedure".
• Make sure that vehicle is under the condition shown in “Conditions of vehicle” before starting diagnosis, and
check each symptom.
• If the following “symptoms” are detected, check systems shown in the “Diagnoses/service procedure” col-
umn in this order.
Conditions of Vehicle (Operating Conditions)
• Intelligent Key is registered.
ANSWER BACK WITH I-KEY
LOCKBuzzer reminder function (lock operation) mode by door request switch (driver side, passenger
side and back door side) can be selected from the following with this mode. The operation mode
will be changed when “CHANGE SETT” on CONSULT-III screen is touched.
• BUZZER: Sound buzzer
• OFF: Non-operation
ANSWER BACK WITH I-KEY UN-
LOCKBuzzer reminder function (unlock operation) mode by door request switch can be changed to op-
erate (ON) or not operate (OFF) with this mode.
AUTO RELOCK TIMERAuto door lock timer mode can select the following with this mode.
• 1 minute
• OFF: Non-operation
PANIC ALARM DELAYPanic alarm button's pressing time on Intelligent Key remote control button can be selected from
the following with this mode. The operation mode will be changed when “CHANGE SETT” on
CONSULT-III screen is touched.
• 0.5 second
• 1.5 second
• OFF: Non-operation
P/W DOWN DELAYUnlock button's pressing time on Intelligent Key remote control button can be selected from the
following with this mode. The operation mode will be changed when “CHANGE SETT” on CON-
SULT-III screen is touched.
• 3 seconds
• 5 seconds
• OFF: Non-operation
ENGINE START BY I-KEYEngine start function mode can be changed to operate (ON) or not operate (OFF) with this mode.
The operation mode will be changed when “CHANGE SETT” on CONSULT-III screen is touched.
LOCK/UNLOCK BY I-KEYDoor lock/unlock function by door request switch (driver side, passenger side and back door side)
mode can be changed to operate (ON) or not operate (OFF) with this mode. The operation mode
will be changed when “CHANGE SETT” on CONSULT-III screen is touched. Monitor item Description
Symptom Diagnosis/service procedure Reference page
Ignition switch does not turn on with Intelligent Key.
[KEY warning lamp (green) illuminates].1. Check steering lock solenoid.BL-131
2. Replace Intelligent Key unit.BL-142

BL-104
< SERVICE INFORMATION >
INTELLIGENT KEY SYSTEM
• Key is not inserted in ignition switch.
• One or more registered Intelligent Keys are in the vehicle.
KEY WARNING LAMP DOES NOT ILLUMINATE
NOTE:
• Before performing the diagnosis in the following table, check “Trouble Diagnosis Procedure”. Refer to BL-99,
"Trouble Diagnosis Procedure".
• Make sure that vehicle is under the condition shown in “Conditions of vehicle” before starting diagnosis, and
check each symptom.
• If the following “symptoms” are detected, check systems shown in the “Diagnoses/service procedure” col-
umn in this order.
• Check if ignition switch turns using mechanical key. If it turns, check if “ENGINE START BY I-KEY” in
“WORK SUPPORT” mode is ON.
Conditions of Vehicle (Operating Conditions)
• Intelligent Key is registered.
• Mechanical key is out of ignition switch.
• One or more registered Intelligent Keys are in the vehicle.
NON-DTC ITEM
NOTE:
• Before performing the diagnosis in the following table, check “Trouble Diagnosis Procedure”. Refer to BL-99,
"Trouble Diagnosis Procedure".
• Make sure that vehicle is under the condition shown in “Conditions of vehicle” before starting diagnosis, and
check each symptom.
• If the following “symptoms” are detected, check systems shown in the “Diagnoses/service procedure” col-
umn in this order.
Conditions of Vehicle (Operating Conditions)
• Intelligent Key is registered.
• Multiple mechanical keys are not set in a keyfob.
(If mechanical keys are near the ignition switch, the operation may not work properly.)
ENGINE START CONDITION CHECK
NOTE:
• Before performing the diagnosis in the following table, check “Trouble Diagnosis Procedure”. Refer to BL-99,
"Trouble Diagnosis Procedure".
Symptom Diagnosis/service procedure Reference page
Ignition switch does not turn on with Intelligent Key.
[KEY warning lamp (red) illuminates].1. Check inside key antenna.BL-129
2. Replace Intelligent Key unit.BL-142
Symptom Diagnosis/service procedure Reference page
Ignition switch does not turn on with Intelligent Key.
[GREEN key warning lamp does not illuminate].1. Check Intelligent Key unit power supply and ground cir-
cuit.BL-110
2. Check ignition knob switch.BL-113
3. Check key switch.BL-110
4. Check "KEY" warning lamp (GREEN).BL-139
5. Replace Intelligent Key unit.BL-142
RED key warning lamp does not illuminate
[Without Intelligent Key].1. Check "KEY" warning lamp (RED).BL-139
2. Replace Intelligent Key unit.BL-142
Symptom Diagnosis/service procedure Reference page
Non DTC Item1. Check key switch.BL-110
2. Check NATS antenna amp.BL-210

INTELLIGENT KEY SYSTEM
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• If the following “symptoms” are detected, check systems shown in the ”Diagnoses/service procedure” col-
umn in this order.
ALL FUNCTIONS OF INTELLIGENT KEY SYSTEM DO NOT OPERATE
NOTE:
• Before performing the diagnosis in the following table, check “Trouble Diagnosis Procedure”. Refer to BL-99,
"Trouble Diagnosis Procedure".
• Make sure that vehicle is under the condition shown in “Conditions of vehicle” before starting diagnosis, and
check each symptom.
• If the following “symptoms” are detected, check systems shown in the “Diagnosis/service procedure” column
in this order.
Conditions of Vehicle (Operating Conditions)
• “ENGINE START BY I-KEY” and “LOCK/UNLOCK BY I-KEY” are ON when setting on CONSULT-III.
• Mechanical key is out of ignition switch.
• Ignition switch is not depressed.
• All doors are closed.
• Intelligent key is registered.
DOOR LOCK/UNLOCK FUNCTION MALFUNCTION
NOTE:
• Before performing the diagnosis in the following table, check “Trouble Diagnosis Procedure”. Refer to BL-99,
"Trouble Diagnosis Procedure".
• Make sure that vehicle is under the condition shown in “Conditions of vehicle” before starting diagnosis, and
check each symptom.
• If the following “symptoms” are detected, check systems shown in the “Diagnosis/procedure” column in this
order.
Conditions of Vehicle (Operating Conditions)
• “LOCK/UNLOCK BY I-KEY” is ON when setting on CONSULT-III.
• Mechanical key is out of ignition switch.
• Ignition switch is not depressed.
• All doors are closed.
• Intelligent Key is registered.
Symptom Diagnosis/service procedure Reference page
Engine start condition check1. Check CVT device (park position switch).
(With CVT)BL-136
2. Check key interlock solenoid (with M/T).BL-133
3. Check stop lamp switch (With CVT).BL-134
4. Check stop lamp switch (with M/T).BL-135
Symptom Diagnosis/service procedure Reference page
All function of Intelligent Key system dose not
operate.1. Check Intelligent Key unit power supply and ground
circuit.BL-110
2. Check Intelligent Key battery inspection.BL-142
3. Replace Intelligent Key unit.BL-142
Symptom Diagnosis/service procedure Reference page
Door lock/unlock does not operate by all request
switches.1. Check door switch (hatchback).BL-114
2. Check door switch (sedan).BL-117
3. Check key switch.BL-110
4. Check ignition knob switch.BL-113
5. Replace Intelligent Key unit.BL-142

BL-210
< SERVICE INFORMATION >
NATS (NISSAN ANTI-THEFT SYSTEM)
NATS (NISSAN ANTI-THEFT SYSTEM)
Component Parts and Harness Connector LocationINFOID:0000000001704103
System DescriptionINFOID:0000000001704104
DESCRIPTION
NOTE:
If customer reports a “No start” condition, request ALL KEYS to be brought to a Nissan dealer in case
of a NATS malfunction.
NATS (Nissan Anti-Theft System) has the following functions:
• NATS shows a higher anti-theft performance at preventing engine to be started by an unregistered key. (reg-
istered key: mechanical key and Intelligent Key).
• Only a key with key ID registered in BCM and ECM can start engine, it has a higher protection against auto
theft that duplicates keys.
• If a malfunction has been detected, security indicator will illuminate when ignition switch is in ON position.
• If the owner requires, mechanical key can be registered for up to 5 keys.
• During trouble diagnosis or when the following parts have been replaced, and if mechanical key is added,
registration* is required.
*: All mechanical keys of the vehicle should be registered.
-ECM
LIIA2920E
1. BCM M18, M19, M20
(view with glove box removed)2. Intelligent Key unit M52
(if equipped)3. NATS antenna amp. M21
(inside steering column)
4. Combination meter M24 5. Security indicator lamp 6. ECM E16

NATS (NISSAN ANTI-THEFT SYSTEM)
BL-211
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-BCM
- Mechanical key
• NATS trouble diagnoses, system initialization and additional registration of other NATS mechanical key IDs
must be carried out using CONSULT-III hardware and CONSULT-III NATS software. When NATS initializa-
tion has been completed, the ID of the inserted mechanical key can be displayed.
Regarding the procedures of NATS initialization and mechanical key ID registration, refer to CONSULT-III
operation manual NATS.
SECURITY INDICATOR
• Forewarns that the vehicle is equipped with NATS.
• Security indicator will not blink while the ignition knob is in ON or START state.
NOTE:
Because security indicator is highly efficient, the battery is barely affected.
Condition of Security Indicator
• When operating the ignition switch with Intelligent Key, security indicator lamp will turn off at once if ignition
switch is pressed and blinks when ignition switch is released.
• When operating the ignition switch with mechanical key security indicator will turn off at once if mechanical
key is inserted into key cylinder and blinks when mechanical key is removed.
(Once the mechanical key is inserted into key cylinder, BCM will only perform the key ID verification with
mechanical key)
System CompositionINFOID:0000000001704105
The function of the NATS consists of the following:
• Mechanical key
• NATS antenna amp. located in the ignition key cylinder
•BCM
• ECM (Engine control module)
• Security indicator
• Intelligent Key unit (if equipped)
NOTE:
The communication between ECM, BCM and/or Intelligent Key unit uses the CAN communication sys-
tem.
ECM Re-communicating FunctionINFOID:0000000001704106
Performing the following procedure can automatically perform re-communication of ECM and BCM or Intelli-
gent Key unit, but only when the ECM has been replaced with a new one which has never been energized on-
board.
(In this step, initialization procedure by CONSULT-III is not necessary)
NOTE:
•When registering new Key IDs or replacing the ECM other than brand new, refer to CONSULT-III
Operation Manual NATS.
LIIA2637E

BL-212
< SERVICE INFORMATION >
NATS (NISSAN ANTI-THEFT SYSTEM)
•If multiple keys are attached to the key holder, separate them before work.
•Distinguish keys with unregistered key ID from those with registered ID.
1. Install ECM.
2. Use a registered key (*), turn ignition switch to “ON”.
*: To perform this step, use the key that has been used before to perform ECM replacement.
3. Maintain ignition switch in “ON” position for at least 5 seconds.
4. Turn ignition switch to “OFF”.
5. Start engine.
If engine can be started, procedure is completed.
If engine cannot be started, refer to CONSULT-III Operation Manual NATS and initialize control unit.

BL-214
< SERVICE INFORMATION >
NATS (NISSAN ANTI-THEFT SYSTEM)
1. Turn ignition switch OFF.
2. Insert NATS program card into CONSULT-III.
3. Connect CONSULT-III to data link connector.
4. Turn ignition switch ON.
5. Touch “START”.
6. Touch “OTHER”.
7. Select “NATS V.5.0”.
If “NATS V5.0” is not indicated, go to GI-36, "
CONSULT-III Data Link Connector (DLC) Circuit" .
8. Perform each diagnostic test mode according to each service procedure.
For further information, see the CONSULT-III Operation Manual NATS.
CONSULT-III DIAGNOSTIC TEST MODE FUNCTION
*: When replace ECM, refer to BL-211, "ECM Re-communicating Function" .
NOTE:
• When any initialization is performed, all ID previously registered will be erased and all NATS mechanical
keys must be registered again.
• The engine cannot be started with an unregistered key. In this case, the system will show “DIFFERENCE OF
KEY” or “LOCK MODE” as a self-diagnostic result on the CONSULT-III screen.
• In rare case, “CHAIN OF ECM-IMMU” might be stored as a self-diagnostic result during key registration pro-
cedure, even if the system is not malfunctioning.
NATS SELF-DIAGNOSTIC RESULTS ITEM CHART
Program card : NATS (AEN06B) or later
LIIA2663E
CONSULT-III DIAGNOSTIC TEST
MODEDescription
C/U INITIALIZATIONWhen replacing any of the following components, C/U initialization and re-registration of all
NATS mechanical keys are necessary.
[NATS mechanical key/ BCM/ ECM*]
SELF-DIAG RESULTSDetected items (screen terms) are as shown in the chart.
Refer to "NATS SELF-DIAGNOSTIC RESULTS ITEM CHART" .
Detected items
[NATS program card screen terms]P No. Code
(Self-diagnostic
result of “EN-
GINE”)Malfunction is detected when.....Reference
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CHAIN OF ECM-IMMU
[P1612]NATS MAL-
FUNCTION
P1612Communication impossible between ECM and BCM
In rare case, “CHAIN OF ECM-IMMU” might be stored
during key registration procedure, even if the system is not
malfunctioning.BL-218
CHAIN OF IMMU-KEY
[P1614]NATS MAL-
FUNCTION
P1614BCM cannot receive the key ID signal.BL-220
ID DISCORD, IMM-ECM
[P1611]NATS MAL-
FUNCTION
P1611The result of ID verification between BCM and ECM is NG.
System initialization is required.BL-221

NATS (NISSAN ANTI-THEFT SYSTEM)
BL-215
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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
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