1999 NISSAN PRIMERA light

System Description
NATS has the following immobiliser functions:

This version of NATS has dongle unit to improve its anti-theft performance (RHD models for Europe).
Dongle unit has its own ID which is registered into NATS IMMU. So if dongle unit is replaced, initializa-
tion must be carried out.

When malfunction of dongle unit is detected:
The security indicator lamp illuminates for about 15 minutes after ignition switch is turned to ON.
When dongle 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.

Since 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.

All 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.

The NATS security indicator (NATS security ind.) blinks when the ignition switch is in“OFF”or“ACC”
position. Therefore, NATS warns outsiders that the vehicle is equipped with the anti-theft system.

When 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 unit) is
detected—6 times blinking
Staying ON after igni-
tion switch is turned
ON—Staying ON
Only malfunction of
dongle unit is detected.—Staying ON for about
15 minutes after igni-
tion switch is turned
ON——
Malfunction of NATS
and engine related
parts are detected.Staying ON6 times blinking
Staying ON after igni-
tion switch is turned
ONStaying ON Staying ON
Only engine related
part malfunction is
detected.Staying ON—Staying ON—
Just after initialization
of NATS—6 times blinking——

NATS 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 CON-
SULT-II operation manual, NATS.

When 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
identification. Therefore, be sure to receive all keys and the PIN code from vehicle owner.
NATS (Nissan Anti-Theft System)
EL-345

Trouble Diagnoses
WORK FLOW
CHECK IN
Listen to customer complaints or request. (Get symptoms)
TROUBLEKEY SERVICE REQUEST (Additional key ID registration)
Verify the security indicator and MI*.INITIALISATION
(Refer to CONSULT-II opera-
tion manual NATS.)
Using the CONSULT-II program card for NATS check the
“SELF-DIAG RESULTS”with CONSULT-II.
Self-diagnostic results referring to NATS, but no informa-
tion about engine self-diagnostic results is displayed on
CONSULT-II.
Turn ignition switch“OFF”.
Repair NATS.
(If necessary, carry out“C/U INITIALIZATION”with CON-
SULT-II.)
Turn ignition switch“ON”.
Erase the NATS“SELF-DIAG RESULTS”by using CON-
SULT-II. (Touch“ERASE”.)
Start the engine.
NGVerify no lighting up of the security indicator.
OK
CHECK OUT
Perform running test with CONSULT-II in engine“SELF-
DIAG RESULTS”mode.
NGVerify“NO DTC IS DETECTED”displayed on the CON-
SULT-II screen.
OK
CHECK OUT
Self-diagnostic results referring to NATS and“DON’T
ERASE BEFORE CHECKING ENG DIAG”are displayed
on CONSULT-II.
(This means that engine trouble data has been detected
in ECM.)
Turn ignition switch“OFF”.
Repair NATS according to self-diagnostic results refer-
ringtoNATS.
(If necessary, carry out“C/U INITIALIZATION”with
CONSULT-II.)
Do not erase the NATS“SELF-DIAG RESULTS”by
using CONSULT-II.
Check the engine“SELF-DIAG RESULTS”with CON-
SULT-II by using the CONSULT-II generic program card.
(Engine diagnostic software included)
OK

Repair engine control system (Refer to EC section.)
when self-diagnostic results except“NATS MALFUNC-
TION”are detected. When only“NATS MALFUNCTION”
is detected, erase the self-diagnostic results and go to
the next step.
Start the engine. Does the engine start properly?NG
Erase the NATS and engine“SELF-DIAG RESULTS”by
using the CONSULT-II program card for NATS and
generic program card.
Start the engine.






















NATS (Nissan Anti-Theft System)
EL-349

SYMPTOM MATRIX CHART 1
(Self-diagnosis related item)
SYMPTOMDisplayed“SELF-DIAG
RESULTS”on
CONSULT-II screenDIAGNOSTIC
PROCEDURE
(Reference page)SYSTEM
(Malfunctioning part or mode)REFERENCE PART
NO. OF ILLUSTRATION
ON NEXT PAGE

Security indicator
lighting up*

Engine does not startECM INT CIRC-IMMUPROCEDURE 1
(EL-352)ECM B

Security indicator
lighting up*

Engine does not startCHAIN OF ECM-IMMUPROCEDURE 2
(EL-353)Open circuit in battery voltage
line of IMMU circuitC1
Open circuit in ignition line of
IMMU circuitC2
Open circuit in ground line of
IMMU circuitC3
Open circuit in communication
line between IMMU and ECMC4
Short circuit between IMMU and
ECM communication line and bat-
tery voltage lineC4
Short circuit between IMMU and
ECM communication line and
ground lineC4
ECM B
IMMU A
DIFFERENCE OF KEYPROCEDURE 3
(EL-355)Unregistered key D
IMMU A
CHAIN OF IMMU-KEYPROCEDURE 4
(EL-356)Malfunction of key ID chip E
IMMU A
Open circuit in ground line of
dongle circuitC6
Open or short circuit in communi-
cation line between IMMU and
dongle unitC5
Dongle control unit G
ID DISCORD, IMM-ECMPROCEDURE 5
(EL-358)System initialisation has not yet
been completed.F
ECM B
LOCK MODEPROCEDURE 7
(EL-361)LOCK MODE D

MI staying ON
Security indicator
lighting up*DON’T ERASE
BEFORE CHECKING
ENG DIAGWORK FLOW
(EL-349)Engine trouble data and NATS
trouble data have been detected
in ECM.—
*: When NATS detects trouble, the security indicator lights up while ignition key is in the“ON”position.
*: When the vehicle is equipped with dongle unit (RHD models for Europe), the security indicator blinks 6 times just after ignition switch is turned
to ON. Then the security indicator lights up while ignition key is in the“ON”position.
NATS (Nissan Anti-Theft System)
Trouble Diagnoses (Cont’d)
EL-350

SYMPTOM MATRIX CHART 2
(Non self-diagnosis related item)
SYMPTOMDIAGNOSTIC PROCEDURE
(Reference page)SYSTEM
(Malfunctioning part or mode)REFERENCE PART
NO. OF ILLUSTRATION
ON NEXT PAGE

Security ind. does not light up.PROCEDURE 6
(EL-360)Security ind.
Open circuit between Fuse and
NATS IMMU
Continuation of initialization mode
NATS IMMU
Security ind. does not blink just
after initialization even if the
vehicle is equipped with dongle
unit.
PROCEDURE 8
(EL-362)NATS might be initialized without connecting dongle unit properly.
Open circuit in ground line of
dongle circuitC6
Security ind. does not blink just
after ignition switch is turned to
ON when some malfunction
related to NATS is detected even
if the vehicle is equipped with
dongle unit.Open or short circuit in communi-
cation line between IMMU and
dongle unitC5
Dongle control unit G
DIAGNOSTIC SYSTEM DIAGRAM
NEL559 PA R T DKey ID chip (PART E)
NATS
ignition keyPA R T C 5Security
indicatorPA R T C 2
PA R T C 1
PA R T C 4
PA R T GPA R T A
PA R T B
PA R T C 6PA R T C 3PA R T F
NATS (Nissan Anti-Theft System)
Trouble Diagnoses (Cont’d)
EL-351

DIAGNOSTIC PROCEDURE 6
—With security indicator on dashboard—
“SECURITY INDICATOR LAMP DOES NOT LIGHT UP”
Check 10A fuse [No.16 , located in the
fuse block (J/B)].
OK
NG
Replace fuse.
NATS INITIALISATION
1) Install the 10A fuse.
2) Perform initialisation with
CONSULT-II.
For the operation of
initialisation, refer to“CON-
SULT-II operation manual
NATS”.
Turn ignition switch“OFF”.
Start engine and turn ignition switch
“OFF”.
Check the security ind. lighting.
NG
OK
INSPECTION END
Check voltage between security indica-
tor lamp connector terminal

2and
ground.
Voltage: Battery voltage
OK
NG
Check harness for open
or short between fuse
and security indicator
lamp.
CHECK INDICATOR LAMP.
OK
NG
Replace indicator lamp.
CHECK NATS IMMU FUNCTION.
1. Connect NATS IMMU connector.
2. Disconnect security indicator lamp
connector.
3. Check continuity between NATS
IMMU terminal

6and ground.
Continuity should exist intermit-
tently.
OK
NG
NATS IMMU is malfunc-
tioning. Replace IMMU.
Perform initialisa-
tion with CON-
SULT-II.
For the operation
of initialisation,
refer to“CON-
SULT-II operation
manual NATS”.
Check harness for open or short
between security indicator and NATS
IMMU.
YEL482B
Security indicator
lamp connector
YEL483B
IMMU connector









NATS (Nissan Anti-Theft System)
Trouble Diagnoses (Cont’d)
EL-359

DIAGNOSTIC PROCEDURE 6
—With security indicator built-in combination
meter—
“SECURITY INDICATOR LAMP DOES NOT LIGHT UP”
Check 10A fuse [No.16 , located in the
fuse block (J/B)].
OK
NG
Replace fuse.
NATS INITIALISATION
1) Install the 10A fuse.
2) Perform initialisation with
CONSULT-II.
For the operation of
initialisation, refer to“CON-
SULT-II operation manual
NATS”.
Turn ignition switch“OFF”.
Start engine and turn ignition switch
“OFF”.
Check the security ind. lighting.
NG
OK
INSPECTION END
Check voltage between combination
meter connector terminal

2and
ground.
Voltage: Battery voltage
OK
NG
Check harness for open
or short between fuse
and combination meter.
CHECK INDICATOR LAMP.
OK
NG
Replace combination
meter.
CHECK NATS IMMU FUNCTION.
1. Connect NATS IMMU connector.
2. Disconnect combination meter con-
nector.
3. Check continuity between NATS
IMMU terminal

6and ground.
Continuity should exist intermit-
tently.
OK
NG
NATS IMMU is malfunc-
tioning. Replace IMMU.
Perform initialisa-
tion with CON-
SULT-II.
For the operation
of initialisation,
refer to“CON-
SULT-II operation
manual NATS”.
Check harness for open or short
between combination meter and NATS
IMMU.
YEL037D
YEL483B
IMMU connector









NATS (Nissan Anti-Theft System)
Trouble Diagnoses (Cont’d)
EL-360

Passenger Compartment
LHD MODELS
YEL235C Time control unit
Blower
relay
Circuit
breaker-1Indicator control unit
Stop lamp switchNATS IMMU
Auto level control unit
Headlamp washer timer
Ignition
relay
Circuit breaker-2
Theft warning horn relay
Fuse block (J/B)
Rear window defogger relayAir bag diagnosis sensor unit
TCM (Transmission control module)Daytime light control unit
Fuse block (J/B)
Time control unt
Power window relay
Front fog lamp relay
Fuel pump relayA/C LOW relay, A/C MED-LOW relay, A/C MED-HIGH relay, A/C HIGH relayECM
LOCATION OF ELECTRICAL UNITS
EL-366

8. Remove the following parts:
IRH and LH front tires
IUndercovers
ISplash covers
IRH and LH brake caliper assemblies
:54-64N×m (5.5 - 6.5 kg-m, 40 - 47 ft-lb)
Brake hose does not need to be disconnected from brake
caliper assembly. Never depress brake pedal.
IRH & LH drive shaft. Refer to FA section (ªDrive Shaftº,
ªFRONT AXLEº).
When removing drive shaft, be careful not to damage tran-
saxle side grease seal.
IDisconnect control rod and support rod from transaxle.
Control rod:
:14-18N×m (1.4 - 1.8 kg-m, 10 - 13 ft-lb)
Support rod:
:35-47N×m (3.6 - 4.8 kg-m, 26 - 35 ft-lb)
ICenter member
IFront exhaust tube
IStabilizer bar
ICooling fan
IRadiator
ICylinder head front mounting bracket
IRemove air duct and disconnect wires, harness, pipes, hoses
and so on.
9. Lift up engine slightly and disconnect or remove all engine
mountings.
When lifting engine, be sure to clear surrounding parts. Use
special care near brake tubes and brake master cylinder.
10. Remove engine with transaxle as shown.
SEM174D
NEM330
.SEM875DA
SEM419D
ENGINE REMOVALQG
Removal and Installation (Cont'd)
EM-50