2008 NISSAN LATIO ECU

BL-204
< SERVICE INFORMATION >
VEHICLE SECURITY (THEFT WARNING) SYSTEM
3. Check continuity between BCM connector (A) M18 terminal 23
and combination meter connector (B) M24 terminal 18.
4. Check continuity between BCM connector (A) M18 terminal 23
and ground.
OK or NG
OK >> Check the following:
• 10A fuse [No. 13, located in fuse block (J/B)]
• Harness for open or short between combination meter and fuse
NG >> Repair or replace harness.
Diagnosis Procedure 3INFOID:0000000001704096
1.FRONT DOOR LOCK ASSEMBLY LH (KEY CYLINDER SWITCH) CHECK
Check front door lock assembly LH (key cylinder switch) with key.
Do doors lock/unlock when using the key?
YES >> Front door lock assembly LH (key cylinder switch) is OK.
NO >> Check front door lock assembly LH (key cylinder switch) circuit. Refer to BL-47, "
Front Door Key
Cylinder Switch LH Check".
Diagnosis Procedure 4INFOID:0000000001704097
VEHICLE SECURITY HORN ALARM CHECK
1.CHECK HORN OPERATION
Check if horn sounds with horn switch.
Does horn operate?
YES >> Check harness for open or short between IPDM E/R and horn relay.
NO >> Check horn circuit. Refer to WW-37
.
Diagnosis Procedure 5INFOID:0000000001704098
VEHICLE SECURITY HEADLAMP ALARM CHECK
1.CHECK VEHICLE SECURITY HEADLAMP ALARM OPERATION
Check if headlamps operate with lighting switch.
Do headlamps come on when turning switch ON?
YES >> Headlamp alarm is OK.
NO >> Check headlamp system. Refer to LT- 4
or LT- 2 5.
Diagnosis Procedure 6INFOID:0000000001704099
DOOR LOCK/UNLOCK SWITCH CHECK
1.CHECK DOOR LOCK/UNLOCK SWITCH INPUT SIGNAL
Check if power door lock operates with door lock/unlock switch.
Do doors lock/unlock when using each door lock/unlock switch?
YES >> Door lock/unlock switch is OK.
NO >> Refer to BL-42, "
Door Lock and Unlock Switch Check".
Diagnosis Procedure 7INFOID:0000000001704100
DOOR SWITCH CHECK (SEDAN)
23 - 18 : Continuity should exist.
23 - Ground : Continuity should not exist.
WIIA1269E

VEHICLE SECURITY (THEFT WARNING) SYSTEM
BL-205
< SERVICE INFORMATION >
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1.CHECK DOOR SWITCHES INPUT SIGNAL
With CONSULT-III
Check door switches ("DOOR SW-DR", "DOOR SW-AS", "DOOR SW-RL", "DOOR SW-RR") in DATA MONI-
TOR mode with CONSULT–III. Refer to BL-196, "
CONSULT-III Function (BCM)".
• When doors are open:
• When doors are closed:
Without CONSULT-III
Check voltage between BCM connector M18 or M19 terminals 12, 13, 47, 48 and ground.
OK or NG
OK >> Door switch circuit is OK.
NG >> GO TO 2.
2.CHECK DOOR SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect door switch and BCM.
3. Check continuity between door switch connector B8 (Front LH) or B108 (Front RH) terminal 2, B6 (Rear
LH) or B116 (Rear RH) terminal 1 and BCM connector M18, M19 terminals 12, 13, 47 and 48.
4. Check continuity between door switch connector B8 (Front LH)
or B108 (Front RH) terminal 2, B6 (Rear LH) or B116 (Rear RH)
terminal 1 and ground.
OK or NG
DOOR SW-DR : ON
DOOR SW-AS : ON
DOOR SW-RL : ON
DOOR SW-RR : ON
DOOR SW-DR : OFF
DOOR SW-AS : OFF
DOOR SW-RL : OFF
DOOR SW-RR : OFF
Connector ItemTe r m i n a l s
ConditionVoltage (V)
(Approx.)
( + ) ( – )
M19Front door
switch LH47
GroundOpen
↓
Closed0
↓
Battery voltage Rear door
switch LH48
M18Front door
switch RH12
Rear door
switch RH13
LIIA1177E
2 - 47 : Continuity should exist.
2 - 12 : Continuity should exist.
1 - 48 : Continuity should exist.
1 - 13 : Continuity should exist.
2 - Ground : Continuity should not exist.
1 - Ground : Continuity should not exist.
LIIA1350E

BL-206
< SERVICE INFORMATION >
VEHICLE SECURITY (THEFT WARNING) SYSTEM
OK >> GO TO 3.
NG >> Repair or replace harness.
3.CHECK DOOR SWITCHES
Check continuity between door switch terminal and switch case ground.
OK or NG
OK >> Check door switch case ground condition.
NG >> Replace door switch.
Diagnosis Procedure 8INFOID:0000000001704101
TRUNK LAMP SWITCH CHECK (SEDAN)
1.CHECK TRUNK LAMP SWITCH AND TRUNK RELEASE SOLENOID INPUT SIGNAL
With CONSULT-III
Check (“TRNK OPN MNTR”) in “DATA MONITOR” mode with CONSULT-III.
Without CONSULT-III
1. Turn ignition switch OFF.
2. Check voltage between BCM harness connector M19 terminal 42 and ground.
OK or NG
OK >> Trunk lamp switch and trunk release solenoid circuit is
OK.
NG >> GO TO 2.
2.CHECK TRUNK LAMP SWITCH AND TRUNK RELEASE SOLENOID
1. Turn ignition switch OFF.
2. Disconnect trunk lamp switch and trunk release solenoid connector.
3. Check continuity between trunk lamp switch and trunk release solenoid terminals 1 and 3.
Component TerminalsCondition of
switchContinuity
Front door switch
LH/RH2 – Case groundPushed No
Released Yes
Rear door switch
LH/RH1 – Case groundPushed No
Released Yes
LIIA0550E
Monitor item Trunk condition
TRNK OPN MNTROPEN : ON
CLOSED : OFF
ConnectorTe r m i n a l s
Trunk conditionVoltage (V)
(Approx.)
(+) (-)
M19 42 GroundCLOSED Battery voltage
OPEN 0
WIIA1179E

VEHICLE SECURITY (THEFT WARNING) SYSTEM
BL-207
< SERVICE INFORMATION >
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OK or NG
OK >> GO TO 3.
NG >> Replace trunk lamp switch and trunk release solenoid.
3.CHECK TRUNK LAMP SWITCH AND TRUNK RELEASE SOLENOID CIRCUIT
1. Disconnect BCM connector M19.
2. Check continuity between BCM harness connector M19 (A) ter-
minal 42 and trunk room lamp switch harness connector B127
(B) terminal 3.
3. Check continuity between BCM harness connector M19 (A) terminal 42 and ground.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace harness between BCM and trunk room lamp switch.
4.CHECK TRUNK LAMP SWITCH AND TRUNK RELEASE SOLENOID GROUND CIRCUIT
Check continuity between trunk room lamp switch harness connec-
tor B127 terminal 1 and ground.
OK or NG
OK >> Check connection of harness and connector.
NG >> Repair or replace trunk lamp switch and trunk release solenoid ground circuit.
Diagnosis Procedure 9INFOID:0000000001704102
TRUNK KEY CYLINDER SWITCH CHECK (SEDAN)
1.CHECK TRUNK KEY CYLINDER SWITCH
With CONSULT-III
Check trunk key cylinder switch ("TRUNK CYL SW") in DATA MONITOR mode in CONSULT–III. Refer to BL-
36, "CONSULT-III Function (BCM)".
Terminals Trunk condition Continuity
13CLOSED No
OPEN Yes
WIIA1421E
42 – 3 : Continuity should exist.
WIIA1422E
42 – Ground : Continuity should not exist.
1 – Ground : Continuity should exist.
WIIA1423E

BL-208
< SERVICE INFORMATION >
VEHICLE SECURITY (THEFT WARNING) SYSTEM
• When key inserted in trunk key cylinder is turned to FULL STROKE:
• When key is removed from the trunk key cylinder:
Without CONSULT-III
Check voltage between BCM connector M19 terminal 41 and
ground.
OK or NG
OK >> Trunk key cylinder switch signal is OK.
NG >> GO TO 2.
2.CHECK TRUNK KEY CYLINDER SWITCH GROUND HARNESS
1. Turn ignition switch OFF.
2. Disconnect trunk key cylinder switch.
3. Check continuity between trunk key cylinder switch connector
B142 terminal 2 and body ground.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace harness.
3.CHECK TRUNK KEY CYLINDER SWITCH
Check continuity between trunk key cylinder switch terminals.
OK or NG
OK >> GO TO 4.
NG >> Replace trunk key cylinder switch.
4.CHECK TRUNK KEY CYLINDER HARNESS
1. Disconnect BCM connector M19.TRUNK CYL SW : ON
TRUNK CYL SW : OFF
ConnectorTe r m i n a l s
ConditionVoltage (V)
(Approx.)
( + ) ( – )
M19
41GroundNeutral (N) 5
Full stroke (open) 0
WIIA1425E
Connector Terminals Continuity
B142 2 – Ground Yes
WIIA1427E
Terminals Trunk key cylinder switch position Continuity
1 – 2 Neutral (N) No
Full Stroke (open) Yes
WIIA1428E

VEHICLE SECURITY (THEFT WARNING) SYSTEM
BL-209
< SERVICE INFORMATION >
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2. Check continuity between BCM connector (A) M19 terminal 41
and trunk key cylinder switch connector (B) B142 terminal 1 and
body ground.
OK or NG
OK >> Trunk key cylinder switch circuit is OK.
NG >> Repair or replace harness.
Connector Terminal Connector Terminal Continuity
A: M19 41B: B142 1 Yes
Ground No
WIIA1429E

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
< SERVICE INFORMATION >
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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