immu NISSAN ALMERA N15 1995 Service Manual

NATS(Nissan Anti-Theft System)
System Description

NATS V2.0forNissan modelN15hasthefollowing immobiliser functions:
• Since onlyNATS ignition keys,whose IDnos. have been registered intotheECM andIMMU ofNATS,
allow theengine torun, operation ofastolen vehicle withoutaNATS registered keyisprevented by
NATS.
That isto say, NATS V2.0willimmobilize theengine ifsomeone triestostart itwithout theregis-
tered keyofNATS V2.0.
• Both ofthe originally suppliedignitionkeyIDshave been NATS registered.
If requested bythe vehicle owner,amaximum offour keyIDscan beregistered intotheNATS com-
ponents.
• The NATS security indicator (NATSsecurity ind.)blinks whentheignition switchisin "OFF" or
"ACC" position. Therefore, NATSwarns outsiders thatthevehicle isequipped withtheanti-theft
system.
• When NATSdetects trouble, themalfunction indicatorlamp(MIL) blinks.
• NATS trouble diagnoses, systeminitialisation andadditional registration ofother NATS ignition key
IDs must becarried outusing CONSULT hardwareandCONSULT NATSsoftware.
When NATS initialisation hasbeen completed, theIDofthe inserted ignitionkeyisautomatically
NATS registered. Then,ifnecessary, additionalregistration ofother NATS ignition keyIDscan be
carried out.
Regarding theprocedures ofNATS initialisation andNATS ignition keyIDregistration, refertoCON-
SUL Toperation manual,NATSV2.0.
• When diagnosing NATSV2.0using CONSULT, adapterandadapter harness forNATS V1.0arenot
necessary, althoughadirect DDLcable connection betweenCONSULT andDOL connector is
required.
• When servicing amalfunction ofthe NATS V2.0(indicated byflashing ofMalfunction IndicatorLamp)
or registering anotherNATSignition keyIDno., itmay benecessary tore-register originalkeyiden-
tification. Therefore, besure toreceive allkeys from vehicle owner.

System Composition

The immobiliser functionofthe NATS forNissan modelN15consists ofthe following:
• NATS ignition key
• NATS antenna amp.located inthe ignition keycylinder
• NATS immobiliser controlunit(NATS IMMU)
• Engine control module (ECM)
• NATS security indicator locatedunderthecenter cluster (NATSsecurity ind.)
• Malfunction indicatorlamp(MIL)

NATS ignition key

(
((
(

El-247
SEL304U

•

NATS(Nissan Anti-Theft System)
Wiring Diagram -NATS -
LHD MODELS

EL-NATS-01

ECM(ECCSCONTROL

UNIT)

em

Refer
to
EL-POWER.
FUSE
BLOCK
(JIB)

~

1M1M

Y LCHKRLINELINE

!i*1ll
"2.4/
I~ I 1/
2•6
11

i
COMBINATION ORILY
IG
BR/Y
M~~ER(MIL)
II I

~ OR/L
Y/G
BR/Y

11*.21 ~ It~~4~~~$~--
~Ifll

OR/L OR/L
Y/G
BR/Y

1 __
lt
It It

Y/G
BR/Y

IiTIil
IDil

G

m
OR

m

I

BATTERY
I

•

l75A

~WJ
W/L

I

WIL

~(fI@

~
rn;
I
JUNCTION

BOX
NO.2

(JOINT
CONNECTORS)

~ W/L

I

WIL

rn

NATSIMMU

~

~ lifll
U:¥~

L/OR' GY
IR'
R/L
t
L
t

~~-~~~----~~~----~

L/OR GY
IR
R/L L

m
wh
rrh
m

NATSANTENNA
AMP


~
~

B B

LJ

..
,- .., I

B BB

1
f.J

~~
@:

With tachometer

@:
Without tachometer

*1",@ 30
@
40

•

*2",@ 32
@
8

,

&~~
1211JOSIV 65 W
Refer
tolast page •
(Foldout page).

~WID

~W
r---------------------------------~

L ~
~

,

~

@])

em

HEL147
EL-249

NATS(Nissan Anti-Theft System)
Trouble Diagnoses (Cont'd)
HOW TOREAD SELF-DIAGNOSTIC RESULTS

Resultdisplay screen(Whenmalfunction isdetected)

When touched, the
--l;
ERASE "PRINT
sell-diagnostic results
stored inthe engine
control module (ECM)
are erased. Page
mark

Time data'
This indicates howmany
times thevehicle was
driven afterthelast
detection ofamalfunction
If the malfunction isbeing
detected currently. the
time datawillbe"0".
;J-
When touched, the
self-diagnostic results
are printed out.
DIFFERENCE
OFKEY
•
SELF-DIAG RESULTS.
FAILURE DETECTED
IMMU

Detected
items

FURTHER TESTING
MAY BEREQUIRED.
**

ERASE "PRINT

Result
display screen(Whennomalfunction isdetected)

• SELF-DIAG RESULTS. D
FAILURE DETECTED TIME
*NO SELF DIAGNOSTIC
FAILURE INDICATED.
SEL332UD
*
Iftrip number ismore than1,MIL does notblink .

•

EL-253

NATS(Nissan Anti-Theft System)
Trouble Diagnoses (Cont'd)
CONSULT DIAGNOSTIC TESTMODE FUNCTION

CONSULT DIAGNOSTIC TEST
MODE

C/U
INITIALIZATION
SELF-FUNCTION CHECK
SELF-DIAGNOSTIC RESULTS Description
When replacing anyofthe following threecomponents,
C/U
initialization isnecessary.
[NATS ignition key/lMMU/ECMj
ECM checks itsown NATS communication interfacebyitself.
Detected items(screen terms)areasshown inthe chart below.

SELF-DIAGNOSTIC RESULTSITEMCHART

Detected items(Screen terms) Description Reference
page
IMMU ECMreceived thesignal fromIMMU thatIMMU ismalfunctioning. EL-257
ECM ECMismalfunctioning. EL-257
CHAIN OFECM-IMMU CommunicationimpossiblebetweenECMandIMMU. EL-258
DIFFERENCE OFKEY IMMU
canreceive thekey
10
signal butthe result ofID verification
EL-260
between keyIDand IMMU isNG.
CHAIN OFIMMU-KEY
IMMUcannot receive thekey IDsignal. EL-261
ID DISCORD, IMM-ECM The
result of
10
verification betweenIMMUandECM isNG. System
EL-263
initialisation isrequired.
MINGLE NOISE Noise
(interference) mingledintoNATS communication linesduring
EL-264
communicating.
DON'T ERASE BEFORE CHECK-
Enginetrouble dataandNATS trouble datahave beendetected in
EL-264
ING ENG DIAG ECM.

EL-254

NATS(Nissan Anti-Theft System)
Trouble Diagnoses (Cont'd)
SYMPTOM MATRIXCHART1
(Self-diagnosis relateditem)

X:Possibility item.'MIL: Malfunction IndicatorLamp
SYMPTOM
SYSTEM REFERENCEPART
Displayed"SELF-
DIAGNOSTIC PROCE-
(Malfunctioning NO.OFILLUSTRA-
•Blinking ofMIL'. •
Blinking ofMIL'.
DIAGRESULTS" on
DURE
part ormode) TIONONNEXT PAGE
•Engine willstart. •
Hard tostart
CONSULTscreen.
(Referencepage)
engine.
IMMU A
X IMMUPROCEDURE
1
(EL-257)
ECM BX
ECMPROCEDURE
2
(EL-257)
Open circuit inbat-
tery voltage lineof C1
X
IMMU circuit
Open circuit inigni-
.

tion lineofIMMU cir- C2
X
cuit
Open circuit in
ground lineofIMMU
C3 X
circuit
Open circuit incom-
munication line
C4
X

between IMMUand
ECM CHAINOFECM-
PROCEDURE3
Short circuit between IMMU
(EL-258)
IMMU andECM com-
C4
X

munication lineand
battery voltage line
Short circuit between
IMMU andECM com-
C4 X
munication lineand
ground line
Open circuit inpower
source lineofANTI E3

X

AMP circuit
ECM B X
IMMU A
X

Unregistered key 0 X
PROCEDURE4
DIFFERENCE OFKEY
IMMU A

X
(EL-260)
Communication line
between ANT
I
AMP
E1
X

and IMMU:
Open circuit orshort
circuit ofbattery volt-
age lineorshort cir- E2

X

cuit ofground line
Open circuit inpower
source lineofANTI E3
X
PROCEDURE5
AMP circuit CHAIN
OFIMMU-KEY
(EL-261)
Open circuit in
ground lineofANTI E4

X

AMP circuit
Malfunction ofkey 10
E5 X
chip
IMMU A
X

Antenna amp. E6
X

EL-255
•