2005 NISSAN NAVARA immobilizer

AV-4
SYSTEM DESCRIPTION
SYSTEM DESCRIPTION
PFP:00000
System FunctionsEKS00Q5X
Refer to Owner's Manual for audio system operating instructions.
AUDIO
Speed Sensitive Volume (6CD Player Type)
Volume level of this system gone up and down automatically in proportion to the vehicle speed. And the con-
trol level can be selected by the customer.
NATS AUDIO LINK (WITHOUT NAVIGATION SYSTEM)
Description
The link with the NATS IMMU implies that the audio unit can basically only be operated if connected to the
matching NATS IMMU to which the audio unit was initially fitted on the production line.
Since radio operation is impossible after the link with the NATS is disrupted theft of the audio unit is basically
useless since special equipment is required to reset the audio unit.
Initialization Process for Audio Units That Are Linked to The NATS IMMU
New audio units will be delivered to the factories in the “NEW” state, i.e. ready to be linked with the vehicle's
NATS. When the audio unit in “NEW” state is first switched on at the factory, it will start up communication with
the vehicle's immobilizer control unit (IMMU) and send a code (the “audio unit Code”) to the IMMU. The IMMU
will then store this code, which is unique to each audio unit, in its (permanent) memory.
Upon receipt of the code by the IMMU, the NATS will confirm correct receipt of the audio unit code to the audio
unit. Hereafter, the audio unit will operate as normal.
During the initialization process, “NEW” is displayed on the audio unit display. Normally though, communica-
tion between audio unit and IMMU takes such a short time (300 ms) that the audio unit seems to switch on
directly without showing “NEW” on its display.
Normal Operation
Each time the audio unit is switched on afterwards, the audio unit code will be verified between the audio unit
and the NATS before the audio unit becomes operational. During the code verification process, “WAIT” is
shown on the audio unit display. Again, the communication takes such a short time (300 ms) that the audio
unit seems to switch on directly without showing “WAIT” on its display.
When The Radio Is Locked
In case of a audio unit being linked with the vehicle's NATS (immobilizer system), disconnection of the link
between the audio unit and the IMMU will cause the audio unit to switch into the lock (“SECURE”) mode in
which the audio unit is fully inoperative. Hence, repair of the audio unit is basically impossible, unless the
audio unit is reset to the “NEW” state for which special decoding equipment is required.
Clarion has provided their authorized service representatives with so called “decoder boxes” which can bring
the audio unit back to the “NEW” state, enabling the audio unit to be switched on after which repair can be per-
formed. Subsequently, when the repaired audio unit is delivered to the final user again, it will be in the “NEW”
state to enable re-linking the audio unit to the vehicle's immobilizer system. As a result of the above, repair of
the audio unit can only be done by an authorized Clarion representative (when the owner of the vehicle
requests repair and can show personal identification).
Service Procedure
Item Service procedure Description
Battery disconnection No additional action required. –
Radio needs repair Repair needs to be done by authorized
representative of radio manufacturer since
radio cannot be operated unless it is reset
to NEW state, using special decoding
equipment.–
Replacement of radio by new part No additional action required. Radio is delivered in NEW state.
Transferring radio to another vehicle/
replacement of radio by an “old” partRadio needs to be reset to NEW state by
authorized representative of radio manu-
facturer.–
Replacement of IMMU Radio needs to be reset to NEW state by
authorized representative of Clarion.After switching on the radio, it will display
“SECURE” after 1 minute.

AV-34
TERMINALS AND REFERENCE VALUE FOR CONTROL UNIT
TERMINALS AND REFERENCE VALUE FOR CONTROL UNIT
PFP:00000
Audio Unit (1CD Player Type)EKS00Q6B
Te r m i n a l
(Wire color)
ItemSignal
input/
outputCondition
Reference value
+-Ignition
switchOperation
2
(O)Ground Illumination signal Input ONLighting switch is ON. Approx. 12 V
Lighting switch is OFF. Approx. 0 V
3
(Y)Ground Battery power supply Input ON – Battery voltage
4
(Y)–TELmute – – – –
6
(V)Ground ACC power supply Input ACC – Battery voltage
7
(BR)5
(L)Audio signal front LH Output ON Sound output
8
(W)GroundVehicle speed signal
(2-pulse)Input ONWhen vehicle speed is
approx. 40 km/h (25
MPH).
9
(L)10
(V)Audio signal rear LH Output ON Sound output
12
(SB)– Immobilizer – – – –
13
(LG)11
(V)Audio signal front RH Output ON Sound output
15
(GR)16
(V)Audio signal rear RH Output ON Sound output
19
(W)–TELin(-) – – – –
SKIB1990E
ELF1080D
SKIB1990E
SKIB1990E
SKIB1990E

AV-36
TERMINALS AND REFERENCE VALUE FOR CONTROL UNIT
14
(L)13
(V)Audio signal rear LH Output ON Sound output
16
(GR)15
(V)Audio signal rear RH Output ON Sound output
18
(W)GroundVehicle speed signal
(2-pulse)Input ONWhen vehicle speed is
approx. 40 km/h (25
MPH).
20
(SB)– Immobilizer – – – –
22
(P)25
(L)Remote control signal A Input ONKeep pushing MODE
switch.Approx. 0 V
Keep pushing SEEK UP
switch.Approx. 1.7 V
Keep pushing VOL UP
switch.Approx. 3.3 V
Except for above. Approx. 5 V
23
(W)25
(L)Remote control signal B Input ONKeep pushing POWER
switch.Approx. 0 V
Keep pushing SEEK
DOWN switch.Approx. 1.7 V
Keep pushing VOL
DOWN switch.Approx. 3.3 V
Except for above. Approx. 5V
25
(L)Ground Remote control ground – ON – Approx. 0 V
26
(W)–TELin(–) – – – –
27
(L)–TELin(+) – – – –
28
(Y)–TELmute – – – – Terminal
(Wire color)
ItemSignal
input/
outputCondition
Reference value
+-Ignition
switchOperation
SKIB1990E
SKIB1990E
ELF1080D

NATS(NISSAN ANTI-THEFT SYSTEM)
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System DescriptionEIS00DAP
NATS (Nissan Anti-Theft System) has the following immobilizer functions:
lSince only NATS ignition keys, whose ID No. s have been registered into the ECM and IMMU of NATS,
allow the engine to run, a vehicle operation without a registered key in NATS 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.
lThis version of NATS has dongle unit to improve its anti-theft performance (RHD models). Dongle unit has
its own ID which is registered into NATS IMMU. So if dongle unit is replaced, initialization must be per-
formed.
lWhen 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 cannot be started. How-
ever engine can be started only one time when security indicator lamp turns off in about 15 minutes after
ignition switch is turned to ON.
lAll of the originally supplied ignition key IDs have been NATS registered in NATS.
If the vehicle owner requests, a maximum of four key IDs can be registered into the NATS components.
lThe security indicator 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.
lWhen NATS detects malfunction, the security indicator lamp lights up as follows.
lNATS trouble diagnoses, system initialization and additional registration of other NATS ignition key IDs
must be performed using CONSULT-II hardware and CONSULT-II NATS software.
Regarding the procedures of NATS initialization and NATS ignition key ID registration, refer to CONSULT-
II operation manual, NATS.
lWhen 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 identi-
fication. Therefore, be sure to receive ALL KEYS from vehicle owner.
Condition IGN ON andWith dongle Without dongle
Security indicator Security indicator
NATS malfunction (except dongle unit) is
detected1. 6 times blinking
2. Staying ON after ignition switch is turned ON.Staying ON
Only malfunction of dongle unit is
detected.Staying ON for about 15 minutes after ignition
switch is turned ON.—
Malfunction of NATS and engine related
parts are detected.1. 6 times blinking
2. Staying ON after ignition switch is turned ON.Staying ON
Only engine related part malfunction is
detected.——
Just after initialization of NATS 6 times blinking —

BL-172
NATS(NISSAN ANTI-THEFT SYSTEM)
System Composition
EIS00DAQ
The immobilizer function of the NATS consists of the following:
lNATS ignition key
lMechanical key (with Intelligent Key system)
lNATS antenna amp. located in the ignition key cylinder
lBCM
lEngine control module (ECM)
lDongle unit (RHD models)
lSecurity indicator
NOTE:
The communication between ECM, BCM and/or Intelligent Key unit uses the CAN communication sys-
tem.
ECM Re-communicating FunctionEIS00DAR
Performing following procedure can automatically perform re-communication of ECM and BCM or Intelligent
Key unit, but only when the ECM has been replaced with a new one (*1).
*1: New one means a virgin ECM which has never been energized on-board.
(In this step, initialization procedure by CONSULT-II is not necessary)
NOTE:
lWhen registering new Key IDs or replacing the ECM other than brand new, refer to CONSULT-II
Operation Manual NATS.
lIf multiple keys are attached to the key holder, separate them before work.
lDistinguish keys with unregistered key ID from those with registered ID.
1. Install ECM.
2. Usingaregisteredkey(*2),turnignitionswitchto“ON”.
*2: To perform this step, use the key (except for card plate key) that has been used before performing
ECM replacement.
3. Maintain ignition switch in “ON” position for at least 5 seconds.
4. Turn ignition switch to “OFF”.
5. Start engine.
If engine can be started, procedure is completed.
If engine cannot be started, refer to CONSULT-II Operation Manual NATS and initialize control unit.
SIIA1246E

PRECAUTIONS
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PRECAUTIONSPFP:00001
DescriptionEAS001GG
Observe the following precautions to ensure safe and proper servicing. These precautions are not
described in each individual section.
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
EAS001GH
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. Information necessary to service the system safely is included in the SRS and SB section of
this Service Manual.
WARNING:
lTo avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer.
lImproper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.
lDo not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.
Precautions for NATS (NISSAN ANTI-THEFT SYSTEM)EAS001GI
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.
The security indicator is located on the instrument panel. The indicator blinks when the immobilizer system is
functioning.
Therefore, NATS warns outsiders that the vehicle is equipped with the anti-theft system.
lWhen NATS detects trouble, the security indicator lamp lights up while ignition switch is in "ON" position.
This lighting up indicates that the anti-theft is not functioning, so prompt service is required.
lWhen servicing NATS (trouble diagnoses, system initialization and additional registration of other NATS
ignition key IDs), CONSULT-II hardware and CONSULT-II NATS software is necessary.
Regarding the procedures of NATS initialization and NATS ignition key ID registration, refer to CONSULT-
II operation manual, NATS.
Therefore, CONSULT-II NATS software (program card and operation manual) must be kept strictly con-
fidential to maintain the integrity of the anti-theft function.
lWhen servicing NATS (trouble diagnoses, system initialization and additional registration of other NATS
ignition key IDs), it may be necessary to re-register original key identification. Therefore, be sure to
receive all keys from vehicle owner. A maximum of four or five key IDs can be registered into NATS.
lWhen failing to start the engine first time using the key of NATS, start as follows.
1. Leave the ignition key in "ON" position for approximately 5 seconds.
2. Turn ignition key to "OFF" or "LOCK" position and wait approximately 5 seconds.
3. Repeat step 1 and 2 again.
4. Restart the engine while keeping the key separate from any others on key-chain.
Precautions Necessary for Steering Wheel Rotation After Battery DisconnectEAS001HY
NOTE:
lThis Procedure is applied only to models with Intelligent Key system and NATS (NISSAN ANTI-THEFT
SYSTEM).
lRemove and install all control units after disconnecting both battery cables with the ignition knob in the
²LOCK²position.
lAlways use CONSULT-II to perform self-diagnosis as a part of each function inspection after finishing
work. If DTC is detected, perform trouble diagnosis according to self-diagnostic results.
For models equipped with the Intelligent Key system and NATS, an electrically controlled steering lock mech-
anism is adopted on the key cylinder.