2008 NISSAN LATIO sensor

BL-78
< SERVICE INFORMATION >
INTELLIGENT KEY SYSTEM
* : Hatchback
** : Sedan
KEY REMINDER FUNCTION
Key reminder functions have the following 2 functions.
CAUTION:
• The above function operates when the Intelligent Key is inside the vehicle. However, there may be
times when the Intelligent Key cannot be detected, and this function will not operate when the Intelli-
gent Key is on the instrument panel, rear parcel shelf or in the glove box. Also, this system some-
times does not operate if the Intelligent Key is in the door pocket of an open door.
List of Operation Related Parts
Parts marked with × are the parts related to operation
REMOTE KEYLESS ENTRY FUNCTIONS
The Intelligent Key has the same functions as the remote keyless entry system. Therefore, it can be used in
the same manner as the keyfob by operating the door lock/unlock button.
Door lock open function
Intelligent Key
Key switch
Ignition knob switch
Door switch
Back door lock assembly (back door switch)
*
Request switch (driver, passenger, back)
Door lock actuator
Inside key antenna
Outside key antenna
Intelligent Key warning buzzer (front door LH)
Intelligent Key warning buzzer (trunk)
**
Intelligent Key unit
CAN communication system
BCM
Hazard warning lamp
Door lock/unlock function by request switch××××××××××
Door lock/unlock function by mechanical key××
Hazard and buzzer reminder function××××××
Auto door lock function×××× × ×××
Key reminder function Operation condition Operation
Door is open to closeRight after all doors are closed under the following conditions.
• Intelligent Key is inside the vehicle
• Any door is opened
• All doors are locked by door lock and unlock switch or door
lock knob• All doors unlock operation
• Sound Intelligent Key warn-
ing buzzer for 3 seconds
Key reminder functions
Intelligent Key
Door switch
Unlock sensor
Door lock actuator
Inside key antenna
Intelligent Key warning buzzer(s)
Intelligent Key unit
CAN communication system
BCM
Any door open to close×××××××××

INTELLIGENT KEY SYSTEM
BL-97
< SERVICE INFORMATION >
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17 WRear bumper antenna
(+) signal
LOCK Press back door request switch.
18 BRear bumper antenna
(-) signal
19 VFront outside antenna
LH (+) signal
LOCK Press door request switch LH.
20 PFront outside antenna
LH (-) signal
22
*2BR Key interlock solenoid —With Intelligent Key present or mechanical
key in ignition cylinder, press "PUSH" but-
ton on ignition cylinder.Battery voltage
Other than above 0
23 LG Back door open output —Back door open (switch closed) 0
Back door closed (switch open) 5
24 VBack door opener
switch—Press and hold back door switch. 0
Other than above 5
25 LFront door request
switch RH—Press front door request switch RH. 0
Other than above 5
26 SB Stop lamp switch —Depress brake pedal Battery voltage
Other than above 0
27 W Ignition knob switch —Press ignition switch. Battery voltage
Release ignition switch. 0
28 YUnlock sensor
(driver side)—Door (driver side) is locked. 5
Door (driver side) is unlocked. 0
29 VBack door request
switch (hatchback)—Press back door request switch. 0
Other than above 5
Trunk opener request
switch (sedan)—Press trunk opener request switch. 0
Other than above 5
31 BRSteering lock solenoid
ground—— 0
32 GRSteering lock solenoid
communication signalLOCKWhen Intelligent Key is inside vehicle,
press ignition knob switch.
Other than above 5 TerminalWire
ColorItemCondition
Voltage (V)
Approx. Ignition
Switch
PositionOperation or Conditions
SIIA1910J
SIIA1910J
SIIA1911J

BL-106
< SERVICE INFORMATION >
INTELLIGENT KEY SYSTEM
REMOTE KEYLESS ENTRY 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/service procedure” column
in this order.
Conditions of Vehicle (Operating Conditions)
• Ignition switch is not depressed.
• All doors are closed.
Door lock/unlock does not operate by request
switch (driver side).1. Check door request switch (driver side).BL-1182. Check outside key antenna (driver side).BL-126
3. Replace Intelligent Key unit.BL-142
Door lock/unlock does not operate by request
switch (passenger side).1. Check door request switch (passenger side).BL-1182. Check outside key antenna (passenger side).BL-126
3. Replace Intelligent Key unit.BL-142
Door lock/unlock does not operate by back door
request switch (hatchback).1. Check back door request switch.BL-1202. Check outside key antenna (rear bumper).BL-128
3. Replace Intelligent Key unit.BL-142
Door lock/unlock does not operate by trunk
opener request switch (sedan).1. Check trunk opener request switch.BL-1222. Check outside key antenna (rear bumper).BL-128
3. Replace Intelligent Key unit.BL-142
Auto lock function does not operate.1. Check “AUTO RELOCK TIMER” setting in “WORK
SUPPORT”.BL-101
2. Replace Intelligent Key unit.BL-142
Key reminder function does not operate.1. Check door switch (hatchback).BL-114
2. Check door switch (sedan).BL-117
3. Check inside key antenna.BL-129
4. Check unlock sensor.BL-124
5. Check Intelligent Key battery.BL-142
6. Replace Intelligent Key unit.BL-142
Symptom Diagnosis/service procedure Reference page
Symptom Diagnosis/service procedureReference
page
All of the remote keyless entry functions do
not operate.1. Check Intelligent Key unit power supply and ground circuit.BL-110
2. Check key switch (BCM input).BL-112
3. Check Intelligent Key battery.BL-142
4. Remote Keyless Entry function inspection.BL-142
5. Replace Intelligent Key unit.BL-142
Auto lock function does not operate.1. Check “AUTO RELOCK TIMER” setting in “WORK SUPPORT”.BL-1012. Replace Intelligent Key unit.BL-142

INTELLIGENT KEY SYSTEM
BL-107
< SERVICE INFORMATION >
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HAZARD AND BUZZER REMINDER 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/service procedure” column
in this order.
Conditions of Vehicle (Operating Conditions)
• Ignition switch is not depressed.
• All doors are closed.
WARNING CHIME/BUZZER FUNCTION MALFUNCTION
NOTE:
• Before performing the diagnosis in the following table, check “Trouble Diagnosis Procedure”. Refer to BL-99,
"Trouble Diagnosis Procedure".
Key reminder function does not operate.1. Check door switch (hatchback).BL-114
2. Check door switch (sedan).BL-117
3. Check inside key antenna.BL-129
4. Check unlock sensor.BL-124
5. Check Intelligent Key battery.BL-142
6. Replace Intelligent Key unit.BL-142
Panic alarm function does not operate.1. Check “PANIC ALARM DELAY” setting in “WORK SUPPORT”.BL-101
2. Check Intelligent Key battery inspection.BL-142
3. Check horn function.BL-140
4. Check headlamp function.BL-141
5. Check key switch.BL-110
6. Check ignition knob switch.BL-113
7. Replace Intelligent Key unit.BL-142
Symptom Diagnosis/service procedureReference
page
Symptom Diagnosis/service procedure Reference page
Hazard reminder does not operate by request
switch.
(Buzzer reminder operate).1. Check “HAZARD ANSWER BACK” setting in “WORK
SUPPORT”.BL-101
2. Check hazard function with hazard switch.BL-140
3. Replace Intelligent Key unit.BL-142
Buzzer reminder does
not operate by request
switch.
(Hazard reminder oper-
ates).Intelligent Key
warning buzzer
does not operate.1. Check “ANSER BACK WITH I-KEY LOCK” or “ANSER
BACK WITH I-KEY UNLOCK” setting in “WORK SUP-
PORT”.BL-101
2. Check Intelligent Key warning buzzer(s).BL-125
3. Replace Intelligent Key unit.BL-142
Hazard reminder does not operate by Intelli-
gent Key (door lock/unlock button).
(Buzzer reminder operates properly).1. Check “HAZARD ANSWER BACK” setting in “WORK
SUPPORT”.BL-101
2. Check hazard function with hazard switch.BL-140
3. Replace Intelligent Key.BL-142
Buzzer reminder does
not operate by Intelligent
Key (door lock/unlock
button).
(Hazard reminder oper-
ates).Intelligent Key
warning buzzer
does not operate.1. Check “HORN WITH KEYLESS LOCK” setting in “WORK
SUPPORT”.BL-101
2. Check Intelligent Key warning buzzer(s).BL-125
3. Replace Intelligent Key unit.BL-142

BL-124
< SERVICE INFORMATION >
INTELLIGENT KEY SYSTEM
OK or NG
OK >> Check the condition of harness and connector.
NG >> Replace Intelligent Key unit. Refer to BL-142, "
Removal
and Installation of Intelligent Key Unit".
Unlock Sensor CheckINFOID:0000000001704023
1.CHECK UNLOCK SENSOR INPUT SIGNAL
Check voltage between Intelligent Key unit connector and ground.
OK or NG
OK >> Unlock sensor circuit is OK.
NG >> GO TO 2.
2.CHECK UNLOCK SENSOR CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect Intelligent Key unit and front door lock actuator LH (door unlock sensor) connector.
3. Check continuity between Intelligent Key unit connector (A) terminal 28 and front door lock actuator LH
(door unlock sensor) connector (B) terminal 4.
4. Check continuity between Intelligent Key unit connector and
ground.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace harness between Intelligent Key unit and front door lock actuator LH (door
unlock sensor).
3.CHECK UNLOCK SENSOR OPERATION
Check unlock sensor.
Te r m i n a l s
Voltage (V)
(Approx.) (+)
(–)
Intelligent Key unit
connectorTe r m i n a l
M52 29 Ground 5
PIIB6617E
Te r m i n a l s
Front door
lock
(driver side)
conditionVoltage (V)
(Approx.) (+)
(–)
Intelligent Key
unit connectorTe r m i n a l
M52 28 GroundLocked 5
Unlocked 0
PIIB6638E
AB
Continuity
Intelligent Key unit
connectorTe r m i n a l Front door lock ac-
tuator LH (door un-
lock sensor)
connectorTe r m i n a l
M52 28 D3 4 Yes
A
GroundContinuity
Intelligent Key unit con-
nectorTerminal
M52 28 No
PIIB6639E

INTELLIGENT KEY SYSTEM
BL-125
< SERVICE INFORMATION >
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OK or NG
OK >> GO TO 4.
NG >> Replace unlock sensor.
4.CHECK UNLOCK SENSOR GROUND CIRCUIT
Check continuity between front door lock actuator LH (door unlock sensor) connector and ground.
OK or NG
OK >> GO TO 5.
NG >> Repair or replace harness.
5.CHECK INTELLIGENT KEY UNIT OUTPUT SIGNAL
1. Connect Intelligent Key unit harness connector.
2. Check voltage between Intelligent Key unit connector and ground.
OK or NG
OK >> Replace front door lock actuator LH (door unlock sen-
sor). Refer to BL-150, "
Removal and Installation".
NG >> Replace Intelligent Key unit. Refer to BL-142, "
Removal
and Installation of Intelligent Key Unit".
Intelligent Key Warning Buzzer(s) CheckINFOID:0000000001704024
1.CHECK INTELLIGENT KEY WARNING BUZZER POWER SUPPLY CIRCUIT
1. Disconnect inoperative Intelligent Key warning buzzer connector.
2. Check voltage between Intelligent Key warning buzzer connector and ground.
OK or NG
OK >> GO TO 2.
Te r m i n a l
Driver side door
conditionContinuity
Unlock sensor
45Lock No
Unlock Yes
PIIB6643E
Front door lock actua-
tor LH (door unlock
sensor) connectorTe r m i n a l
GroundContinuity
D3 5 Yes
PIIB6644E
Te r m i n a l s
Voltage (V)
(Approx.) (+)
(–)
Intelligent Key unit
connectorTe r m i n a l
M52 28 Ground 5
PIIB6638E
Te r m i n a l s
Voltage (V)
(Approx.) (+)
(–)
Intelligent Key warning buzzer
connectorTerminal
Front door LH D6
1 Ground Battery voltage
Trunk (sedan) B32
PIIB6622E

BL-156
< SERVICE INFORMATION >
BACK DOOR LOCK
BACK DOOR LOCK
Component Parts and Harness Connector LocationINFOID:0000000001704051
System DescriptionINFOID:0000000001704052
Power is supplied at all times
• through 40A fusible link (letter g, located in fuse and fusible link box)
• to BCM terminal 70
• through 10A fuse [No. 8, located in fuse block (J/B)]
• to BCM terminal 57
• through 10A fuse [No. 31, located in fuse block (J/B)]
• to Intelligent Key unit terminal 11 (if equipped).
Ground is supplied
• to BCM terminal 67 and
• to Intelligent Key unit terminal 12 (if equipped)
• through body grounds M57 and M61.
When back door opener switch is ON (pushed), ground is supplied
• to BCM terminal 30 (without Intelligent Key)
• through back door opener switch terminals 1 and 2
• through front door lock actuator LH (door unlock sensor) terminals 4 and 5 (without power windows) or
• through front door lock actuator RH (door unlock sensor) terminals 4 and 5 (with power windows)
• through body grounds M57 and M61
• to Intelligent Key unit terminal 24 (if equipped)
• through back door opener switch terminals 1 and 2
• through body grounds B117, B132 and D402.
Then power is supplied
• through BCM terminal 53
• to back door lock assembly (actuator) terminal 1.
Ground is supplied
LIIA2638E
1. BCM M18, M19, M20
(view with glove box removed)2. Intelligent Key unit M52
(with Intelligent Key)3. Back door lock assembly (actuator)
D405
4. Back door opener switch D408 5. Front door lock actuator (door unlock
sensor) LH D3, RH D114

BACK DOOR LOCK
BL-161
< SERVICE INFORMATION >
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4. Check continuity between BCM connector (A) M18 terminal 30
and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace harness.
3.CHECK BACK DOOR OPENER SWITCH
Check continuity between back door opener switch terminals 1 and 2.
OK or NG
OK >> GO TO 4.
NG >> Replace back door opener switch.
4.CHECK BACK DOOR OPENER SWITCH CIRCUIT 2
1. Disconnect front door lock actuator LH (door unlock sensor) connector.
2. Check continuity between back door opener switch connector (A) D408 terminal 2 and front door lock
actuator LH (door unlock sensor) connector (B) D3 terminal 4.
3. Check continuity between back door opener switch connector
(A) D408 terminal 2 and ground.
OK or NG
OK >> GO TO 5.
NG >> Repair or replace harness between back door opener switch and front door lock actuator LH (door
unlock sensor).
5.CHECK FRONT DOOR LOCK ACTUATOR LH (DOOR UNLOCK SENSOR) GROUND CIRCUIT
Check continuity between front door lock actuator LH (door unlock sensor) connector terminal 5 and ground.
AB
Continuity
BCM connector TerminalBack door opener
switch connectorTe r m i n a l
M18 30 D408 1 Yes
A
GroundContinuity
BCM connector Terminal
M18 30 No
PIIB6469E
Te r m i n a l
Back door opener
switch conditionContinuity
Back door opener switch
12Pushed Yes
Released No
PIIB6470E
AB
Continuity
Back door opener
switch connectorTe r m i n a lFront door lock ac-
tuator LH (door un-
lock sensor)
connectorTe r m i n a l
D408 2 D3 4 Yes
Back door opener
switch connectorTe r m i n a l
GroundContinuity
D408 2 No
WIIA1272E