1998 NISSAN PATROL Ac switch

System Description
NATS has the following immobiliser functions:
+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.
+Both of the originally supplied ignition key IDs have been NATS registered.
If requested by the vehicle owner, a maximum of four 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 malfunction indicator lamp (MIL) blinks.
+NATS trouble diagnoses, system initialisation and additional registration of other NATS ignition key IDs
must be carried out using CONSULT hardware and CONSULT NATS software.
When NATS initialisation has been completed, the ID of the inserted ignition key is automatically NATS
registered. Then, if necessary, additional registration of other NATS ignition key IDs can be carried out.
Regarding the procedures of NATS initialisation and NATS ignition key ID registration, refer to CONSULT
operation manual, NATS.
+When servicing a malfunction of the NATS (indicated by ¯ashing of Malfunction Indicator Lamp)
or registering another NATS ignition key ID no., it may be necessary to re-register original key
identi®cation. Therefore, be sure to receive all keys from vehicle owner.
System Composition
The immobiliser function of the NATS consists of the following:
+NATS ignition key
+NATS antenna amp. located in the ignition key cylinder
+NATS immobiliser control unit (NATS IMMU)
+Engine control module (ECM)
+NATS security indicator
+Malfunction indicator lamp (MIL)
SEL304U
NATS (Nissan Anti-Theft System)/RHD MODELS
EL-255

CONSULT
CONSULT INSPECTION PROCEDURE
1. Turn off ignition switch.
2. Connect ``CONSULT'' to Data link connector for CONSULT.
(Data link connector for CONSULT is located behind the fuse
box cover.)
3. Insert NATS program card into CONSULT.
: Program card
NATS-E940
4. Turn on ignition switch.
5. Touch ``START''.
6. Touch ``V.2.0 (GASOLINE)''.
NOTE: ``V2.0 (GASOLINE)'' should be selected for electrically
controlled diesel and gasoline engines.
7. Perform each diagnostic test mode according to each service
procedure.
For further information, see the CONSULT Operation Manual,
NATS V2.0 (GASOLINE).
SEF532V
SEL327U
SEL328U
SEL329U
NATS (Nissan Anti-Theft System)/RHD MODELS
EL-257

Trouble Diagnoses
WORK FLOW
CHECK IN*Lighting-up mode of MIL (Malfunction Indicator Lamp)
For single malfunction of NATS: Blinking
For dual malfunctions of NATS and an engine-related part:
Stays ON
For single malfunction of an engine-related part: Stays ON
Listen to customer complaints or request. (Get symptoms)
TROUBLEKEY SERVICE REQUEST (Additional key ID registration).Verify the MIL*.INITIALISATION
(Refer to CONSULT operation
manual NATS V2.0.)
cUsing the CONSULT program card for NATS check the ``SELF-
DIAG RESULTS'' with CONSULT.b
Self-diagnostic results referring to NATS, but no information
about engine self-diagnostic results is displayed on CONSULT.Self-diagnostic results referring to NATS and ``DON'T ERASE
BEFORE CHECKING ENG DIAG'' are displayed on CONSULT.
(This means that engine trouble data has been detected in
ECM.)
Turn ignition switch ``OFF''.
Repair NATS.
(If necessary, carry out ``SELF-FUNCTION CHECK'' or ``C/U INI-
TIALISATION'' with CONSULT.)Turn ignition switch ``OFF''.
Turn ignition switch ``ON''.Repair NATS.
(If necessary, carry out ``SELF-FUNCTION CHECK'' or ``C/U INI-
TIALISATION'' with CONSULT.)
Erase the NATS ``SELF-DIAG RESULTS'' by using CONSULT.
(Touch ``ERASE''.)Do not erase the NATS ``SELF-DIAG RESULTS'' by using
CONSULT.
Start the engine.
Start the engine.Check the NATS ``SELF-DIAG RESULTS'' by using CONSULT.
OKNG
NGVerify no blinking of MIL*.
OKTurn ignition switch ``OFF''.
CHECK OUTCheck the engine ``SELF-DIAG RESULTS'' with CONSULT by
using the CONSULT generic program card.
(Engine diagnostic software included)b
Perform running test with CONSULT in engine ``SELF-DIAG
RESULTS'' mode.Repair ECCS. (Refer to EC section.)
NGVerify ``NO FAILURE'' displayed on the CONSULT screen.
OKTurn ignition switch ``ON''.
CHECK OUTErase the engine ``SELF-DIAG RESULTS'' by using CONSULT.
(Touch ``ERASE''.)
Start the engine.
.
.
.
..
.
..
..
..
.
..
..
..
..
..
..
.
NATS (Nissan Anti-Theft System)/RHD MODELS
EL-259

SYMPTOM CHART
SYMPTOMDisplayed ``SELF-DIAG
RESULTS'' on CONSULT
screen.DIAGNOSTIC PROCEDURE
(Reference page)SYSTEM
(Malfunctioning
part or mode)
+MIL blinking
+Engine can start.IMMUPROCEDURE 1
(EL-261)IMMU
ECMPROCEDURE 2
(EL-261)ECM
+MIL blinking
+Engine hard to startCHAIN OF ECM-IMMUPROCEDURE 3
(EL-262)Open circuit in battery voltage line of IMMU circuit
Open circuit in ignition line of IMMU circuit
Open circuit in ground line of IMMU circuit
Open or short circuit in communication line
between IMMU and ECM
Open circuit in power source line of ANT/AMP cir-
cuit
ECM
IMMU
DIFFERENCE OF KEYPROCEDURE 4
(EL-264)Unregistered key
IMMU
CHAIN OF IMMU-KEYPROCEDURE 5
(EL-265)Open or short circuit in communication line
between ANT/AMP and IMMU
Open circuit in power source line of ANT/AMP cir-
cuit
Open circuit in ground line of ANT/AMP circuit
Malfunction of key ID chip
IMMU
Antenna amp.
ID DISCORD, IMM-ECMPROCEDURE 6
(EL-266)System initialisation has not yet been completed.
ECM
MINGLE NOISEPROCEDURE 7
(EL-267)Noise interference in communication line
+MIL blinking
+Engine hard to start
+NATS security indicator
does not blink for 1 minute
after ignition switch is
turned to ``OFF''.LOCK MODEPROCEDURE 9
(EL-268)LOCK MODE
+MIL staying ONDON'T ERASE BEFORE
CHECKING ENG DIAGWORK FLOW
(EL-259)Engine trouble data and NATS trouble data have
been detected in ECM
+NATS security ind. does not
light up.
+Engine can start.ÐPROCEDURE 8
(EL-267)NATS security ind.
Open circuit between Fuse and NATS IMMU
Continuation of initialisation mode
NATS IMMU
*Lighting-up mode of MIL (Malfunction Indicator Lamp)
For single malfunction of NATS: Blinking
For dual malfunctions of NATS and an engine-related part: Stays ON
For single malfunction of an engine-related part: Stays ON
NATS (Nissan Anti-Theft System)/RHD MODELS
Trouble Diagnoses (Cont'd)
EL-260

jA
CHECK COMMUNICATION LINE SHORT
CIRCUIT.
1. Disconnect ECM connector and IMMU
connector.
2. Check continuity between IMMU termi-
nalj
6and ground.
Continuity should not exist.
3. Turn ignition switch to ON.
4. Check voltage between IMMU terminal
j
6and ground.
No voltage should exist.
OK
cNG
Repair harness.
CHECK NATS ANTENNA AMP. CIRCUIT.
1. Disconnect NATS antenna amp. con-
nector.
2. Turn ignition switch ``ON''.
3. Check voltage between antenna amp.
terminalj
4and ground.
Voltage: More than 4.7V
OK
cNG
Repair harness.
SELF-FUNCTION CHECK
1. Connect ECM connector and
disconnect IMMU connector.
2. Turn ignition switch ``ON''.
3. Touch ``SELF-FUNCTION
CHECK'' on CONSULT
``SELECT DIAG MODE''
screen.
(See next page)
Touch ``START''. ECM will then
check its communication interface
by itself.
OK
cNG
+ECM is malfunctioning.
1. Replace ECM.
2. Perform initialisation
with CONSULT.
For the initialisation
procedure, refer to
``CONSULT operation
manual NATS V2.0
(GASOLINE)''.
(See next page)
+IMMU is malfunctioning.
1. Replace IMMU.
2. Perform initialisation with CONSULT.
For the initialisation procedure, refer
to ``CONSULT operation manual
NATS V2.0 (GASOLINE)''.
SEL501V
SEL502V
SEL340U
SEL341U
.
.
.
.
.
NATS (Nissan Anti-Theft System)/RHD MODELS
Trouble Diagnoses (Cont'd)
EL-263

DIAGNOSTIC PROCEDURE 5
Self-diagnostic results:
``CHAIN OF IMMU-KEY'' displayed on CONSULT screen
Con®rm SELF-DIAGNOSTIC
RESULTS ``CHAIN OF IMMU-
KEY'' displayed on CONSULT
screen.
OK
CHECK NATS IGNITION KEY ID CHIP.
Start engine with another registered NATS
ignition key.
Does the engine start?
No
cYe s
+Ignition key ID chip is
malfunctioning.
1. Replace the ignition key.
2. Perform initialisation
with CONSULT.
For the initialisation
procedure, refer to
``CONSULT operation
manual NATS V2.0
(GASOLINE)''.
CHECK IMMU FUNCTION 1.
1. Turn ignition switch to ``ON''.
2. Check voltage between NATS antenna
amp. terminalj
3and ground.
Voltage
NOTE:
Do not remove NATS antenna amp. from
the ignition key cylinder.
OK
cNG
Check harness for open or
short between IMMU and
NATS antenna amp. If har-
ness is OK, replace IMMU.
After replacing IMMU, per-
form initialisation with
CONSULT.
For the initialisation
procedure, refer to ``CON-
SULT operation manual
NATS V2.0 (GASOLINE)''.
CHECK IMMU FUNCTION 2.
1. Turn ignition switch ``ON''.
2. Check voltage between NATS antenna
amp. terminalj
1and ground.
Voltage:
6 sec. after turning ignition switch
``ON''
Approx. 4.5 - 5V
NOTE:
Do not remove NATS antenna amp. from
the ignition key cylinder.
OK
cNG
CHECK IMMU OUTPUT VOLTAGE.
1. Turn the ignition switch ``ON''.
2. Check voltage between NATS antenna
amp. terminalj
4and ground.
Voltage: More than 4.7V
OK
m
NG
j
A
Time (After turning ignition
switch ``ON''.)Voltage [V]
For approx. 0.5 sec. Approx. 2.3 - 5
After 1 sec. 0
SEL373U
SEL550V
SEL551V
SEL502V
.
.
.
.
.
NATS (Nissan Anti-Theft System)/RHD MODELS
Trouble Diagnoses (Cont'd)
EL-265

jA
CHECK ANTENNA AMP. GROUND LINE
CIRCUIT.
1. Turn ignition switch ``OFF''.
2. Check continuity between NATS
antenna amp. terminalj
2and ground.
Continuity should exist.
OK
cNG
Check harness for open or
short between IMMU and
NATS antenna amp. If har-
ness is OK, replace IMMU.
After replacing IMMU, per-
form initialization with
CONSULT. For the initiali-
sation procedure, refer to
``CONSULT operation
manual NATS V2.0
(GASOLINE)''.
NATS antenna amp. is malfunctioning.
When replacing the amp. hold on to amp.
body. Take care not to pull on amp. har-
ness.
DIAGNOSTIC PROCEDURE 6
Self-diagnostic results:
``ID DISCORD, IMM-ECM'' displayed on CONSULT screen
Con®rm SELF-DIAGNOSTIC
RESULTS ``ID DISCORD, IMM-
ECM*'' displayed on CONSULT
screen.* ``ID DISCORD, IMM-ECM'':
Registered ID of IMMU is in
discord with that of ECM.
PERFORM INITIALISATION.
Perform initialisation with CONSULT.
Re-register all NATS ignition key IDs.
For the initialisation procedure, refer to
``CONSULT operation manual NATS
V2.0''.
Can the system be initialized?
Note: If the initialisation is not completed
or fails, CONSULT shows
mes-
sage on the screen.
Ye s
cNo
+ECM is malfunctioning.
1. Replace ECM.
2. Perform initialisation
with CONSULT.
For the initialisation
procedure, refer to
``CONSULT operation
manual NATS V2.0
(GASOLINE)''.
END.
(System initialisation was not completed.)
SEL504V
SEL383U
SEL372U
.
.
.
.
NATS (Nissan Anti-Theft System)/RHD MODELS
Trouble Diagnoses (Cont'd)
EL-266

DIAGNOSTIC PROCEDURE 9
Self-diagnostic results:
``LOCK MODE'' displayed on CONSULT screen
Con®rm SELF-DIAGNOSTIC RESULTS
``LOCK MODE'' is displayed on CONSULT
screen.
1. Turn the ignition switch to OFF position
and wait 1 minute.
(After 1 minute, security indicator will
blink.)
2. Turn the ignition key switch to ON posi-
tion with a registered key.
(Do not start engine.) Wait 5 seconds.
3. Return the key to the OFF position.
4. Repeat steps 2 and 3 twice (total of
three cycles).
5. Start the engine.
Does the engine start?
No
cYe s
System is OK.
(Now the system is
escaped from ``LOCK
MODE''.)
PERFORM INITIALISATION.
Perform initialisation with CONSULT.
For the initialisation procedure, refer to
``CONSULT operation manual NATS V2.0
(GASOLINE)''.
Can the system be initialised?
Note: If the initialisation is incompleted or
failed, CONSULT shows
mes-
sage on the screen.
No
cYe s
System is OK.
Go to DIAGNOSTIC PROCEDURE 5,
EL-265 to check ``CHAIN OF IMMU-KEY''.
SEL790U
SEL372U
.
.
.
NATS (Nissan Anti-Theft System)/RHD MODELS
Trouble Diagnoses (Cont'd)
EL-268