Nissan Quest E52. Instruction — part 1081
SEC-14
< SYSTEM DESCRIPTION >
[WITH INTELLIGENT KEY SYSTEM]
SYSTEM
INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION : Circuit Diagram
INFOID:0000000009650694
JMKIA8238GB
SYSTEM
SEC-15
< SYSTEM DESCRIPTION >
[WITH INTELLIGENT KEY SYSTEM]
C
D
E
F
G
H
I
J
L
M
A
B
SEC
N
O
P
NISSAN VEHICLE IMMOBILIZER SYSTEM-NATS
JMKIA8239GB
SEC-16
< SYSTEM DESCRIPTION >
[WITH INTELLIGENT KEY SYSTEM]
SYSTEM
NISSAN VEHICLE IMMOBILIZER SYSTEM-NATS : System Description
INFOID:0000000009650695
SYSTEM DIAGRAM
INPUT/OUTPUT SIGNAL CHART
Input Signal Item
JMKIA8235GB
Transmit unit
Signal name
ECM
CAN communication
ID verification signal
Engine status signal
IPDM E/R
Push-button ignition switch status signal
Starter relay status signal
Starter control relay signal
Detention witch signal
Interlock/PNP switch signal
Combination meter
Vehicle speed signal (Meter)
ABS actuator and electric unit (control unit)
Vehicle speed signal (ABS)
TCM
Shift position signal
P/N position signal
NATS antenna amp.
Key ID signal
Push-button ignition switch
Push-button ignition switch operation signal
SYSTEM
SEC-17
< SYSTEM DESCRIPTION >
[WITH INTELLIGENT KEY SYSTEM]
C
D
E
F
G
H
I
J
L
M
A
B
SEC
N
O
P
Output Signal Item
SYSTEM DESCRIPTION
• The Nissan Vehicle Immobilizer System-NATS [NVIS (NATS)] prevents the engine from being started by
Intelligent Key whose ID is not registered to the vehicle (BCM). It has higher protection against auto theft
involving the duplication of mechanical keys.
• The ignition key integrated in the Intelligent Key cannot start the engine. When the Intelligent Key battery is
discharged, the NVIS (NATS) ID verification is performed between the transponder integrated with Intelligent
Key and BCM via NATS antenna amp. when the Intelligent Key backside is contacted to push-button ignition
switch while brake pedal is depressed. If the verification result is OK, the engine start operation can be per-
formed by the push-button ignition switch operation.
• Locate the security indicator lamp and always blinks it when the ignition switch is in any position except ON
to warn that the vehicle is equipped with Nissan Anti-Theft System (NATS).
• Up to 4 Intelligent Keys can be registered (including the standard ignition key) upon request from the owner.
• When replacing ECM, BCM or Intelligent Key, the specified procedure (Initialization and registration) using
CONSULT is required.
• Possible symptom of NATS malfunction is “Engine can not start”. This symptom also occurs because of
other than NATS malfunction, so start the trouble diagnosis according to
• If ECM other than genuine part is installed, the engine cannot be started.
For ECM replacement procedure, refer to
SEC-58, "ECM : Work Procedure"
.
PRECAUTIONS FOR KEY REGISTRATION
• The ID registration is a procedure that erases the current NVIS (NATS) ID once, and then registers a new ID.
Therefore before starting the registration operation, collect all registered Intelligent Keys from the customer.
• When registering the Intelligent Key, perform only one procedure to simultaneously register both IDs [NVIS
(NATS) ID and Intelligent Key ID].
SECURITY INDICATOR LAMP
• Security indicator lamp warns that the vehicle is equipped with NATS.
• Security indicator lamp always blinks when the ignition switch is in any position other than ON.
NOTE:
Because security indicator lamp is highly efficient, the battery is barely affected.
ENGINE START OPERATION WHEN INTELLIGENT KEY IS CONTACTED TO PUSH-BUTTON IG-
NITION SWITCH
1.
When brake pedal is depressed while selector lever is in the P position, BCM activates NATS antenna
amp. that is located behind push-button ignition switch.
2.
When Intelligent Key (transponder built-in) backside is contacted to push-button ignition switch, BCM
starts NVIS (NATS) ID verification between BCM and Intelligent Key (transponder built-in) via NATS
antenna amp.
3.
When NATS ID verification result is OK, buzzer in combination meter sounds and BCM transmits the
result to ECM.
4.
BCM turns ACC relay ON and transmits ignition power supply ON signal to IPDM E/R.
5.
IPDM E/R turns the ignition relay ON and starts the ignition power supply.
6.
IPDM E/R turns the starter control relay ON for engine starting in advance.
7.
BCM detects that the selector lever position and brake pedal operation condition.
8.
BCM transmits starter request signal to IPDM E/R and turns the starter relay in IPDM E/R ON if BCM
judges that the engine start condition* is satisfied.
Each door switch
Door open/close condition signal
Stop lamp switch
Brake pedal operation signal
CVT shift selector (detention switch)
P position signal
Transmit unit
Signal name
Reception unit
Signal name
ECM
CAN communication
ID verification signal
Combination meter
Security indicator lamp signal
Inside key antenna
Key ID request signal
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