2002 NISSAN TERRANO Service Repair Manual

YEL169D
TIME CONTROL UNIT (TCU)
Schematic (Cont'd)
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System Description
NATS has the following immobiliser functions:
IThis version of NATS has dongle control unit to improve its anti-theft performance (RHD models). Dongle
control unit has its own ID which is registered into NATS IMMU. So if dongle unit is replaced, initialization
must be carried out.
IWhen malfunction of dongle unit is detected:
The security indicator lamp illuminates for about 15 minutes after ignition switch is turned to ON.
Ð When dongle control unit has a malfunction, and the indicator lamp is illuminated, engine can not be
started. However engine can be started only one time when security indicator lamp turns off in about
15 minutes after ignition switch is turned to ON.
ISince only NATS ignition keys, whose ID nos. have been registered into the ECM and IMMU of NATS,
allow the engine to run, operation of a stolen vehicle without a NATS registered key is prevented by NATS.
That is to say, NATS will immobilize the engine if someone tries to start it without the registered key of
NATS.
IAll of the originally supplied ignition key IDs have been NATS registered.
If requested by the vehicle owner, a maximum of five key IDs can be registered into the NATS compo-
nents.
IThe NATS security indicator (NATS security ind.) blinks when the ignition switch is in ªOFFº or ªACCº
position. Therefore, NATS warns outsiders that the vehicle is equipped with the anti-theft system.
IWhen NATS detects trouble, the security indicator lamp lights up as follows.
Condition IGN ON andWith dongle Without dongle
MIL Security indicator MIL Security indicator
NATS malfunction
(except dongle control
unit) is detectedÐ 6 times blinking
Staying ON after ignition
switch is turned ONÐ Staying ON
Only malfunction of
dongle control unit is
detected.Ð Staying ON for about 15
minutes after ignition
switch is turned ONÐÐ
Malfunction of NATS and
engine related parts are
detected.Staying ON 6 times blinking
Staying ON after ignition
switch is turned ONStaying ON Staying ON
Only engine related part
malfunction is detected.Staying ON Ð Staying ON Ð
Just after initialization of
NATSÐ 6 times blinking Ð Ð
INATS trouble diagnoses, system initialisation and additional registration of other NATS ignition key IDs
must be carried out using CONSULT-II hardware and CONSULT-II NATS software.
Regarding the procedures of NATS initialisation and NATS ignition key ID registration, refer to CONSULT-II
operation manual, NATS.
IWhen servicing a malfunction of the NATS (indicated by lighting up of security Indicator Lamp) or
registering another NATS ignition key ID no., it may be necessary to re-register original key iden-
tification. Therefore, be sure to receive all keys and the PIN code from vehicle owner.
NATS (Nissan Anti-Theft System)
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System Composition
The immobiliser function of the NATS for Nissan model R20 consists of the following:
INATS ignition key
INATS immobiliser control unit (NATS IMMU), located in the ignition key cylinder
IEngine control module (ECM)
IDongle control unit (RHD models)
INATS security indicator
INATS audio link
YEL349D
NATS (Nissan Anti-Theft System)
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Component Parts Location
YEL320D
NATS (Nissan Anti-Theft System)
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Wiring Diagram Ð NATS Ð
LHD MODELS
YEL187D
NATS (Nissan Anti-Theft System)
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LHD MODELS
YEL188D
NATS (Nissan Anti-Theft System)
Wiring Diagram Ð NATS Ð (Cont'd)
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RHD MODELS
YEL189D
NATS (Nissan Anti-Theft System)
Wiring Diagram Ð NATS Ð (Cont'd)
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RHD MODELS
YEL190D
NATS (Nissan Anti-Theft System)
Wiring Diagram Ð NATS Ð (Cont'd)
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