Nissan Terrano r20e. Instruction — part 250

Checks

Once in Diagnostic Mode (and after identifying the last three alarm triggers in case a theft warning system is
equipped on the vehicle), the following inputs can be tested.

USER ACTION

TCU Reaction

COMPONENT TESTED

Driver’s door opened from closed
(all other doors closed)

Hazards flash once

Driver’s door open signal

Passenger or rear door opened from closed
(all other doors closed)

Hazards flash once

Door open signal for opened door

Driver’s door locked from unlocked

Hazards flash once

Driver’s door status signal

Passenger door locked from unlocked

Hazards flash once

Assist door status signal

Rear doors locked from unlocked
(with ultrasonic model)

Hazards flash once

Rear doors status signal

Ultrasonics cancel switch is pressed
(with ultrasonic model)

Hazards flash once

U/S cancel signal

Trunk or back door is opened from closed

Hazards flash once

Trunk open signal

Hood is opened from closed
(with ultrasonic model)

Hazards flash once

Hood open signal

Hazard switch is pressed from off

Hazards flash once

Hazard switch signal

Turn signal switch is moved to left from off

Hazards flash once

Left turn signal

Turn signal switch is moved to right from off

Hazards flash once

Right turn signal

Key turned to lock position in door

Hazards flash once *

Key cylinder lock switch signal

Lighting switch turned 1st position or 2nd
position from off

Hazards flash once

Tail lamp signal

Key put in ignition cylinder from out

Hazards flash once

Key in detect signal

Central unlock switch is pressed

Hazards flash once

Central unlock/Trunk release signal

*) Hazards may flash a second time because of Driver’s door status signal change. The min. delay time between flash actions is

100 ms.

In case the system does not operate as described above, check the concerned circuit for open or short.
After completion, the Diagnostic Mode can be switched off by pressing the rear defogger switch or by turning
the ignition to “ON”. The hazard lamp will flash at 3 Hz for 3 seconds to confirm that Diagnostic Mode has
been switched off.

TIME CONTROL UNIT (TCU)

Trouble Diagnosis (Cont’d)

EL-183

Schematic

YEL168D

TIME CONTROL UNIT (TCU)

EL-184

YEL169D

TIME CONTROL UNIT (TCU)

Schematic (Cont’d)

EL-185

System Description

NATS has the following immobiliser functions:

I

This 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.

I

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 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.

I

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.

I

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.

I

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.

I

When NATS detects trouble, the security indicator lamp lights up as follows.

Condition IGN ON and

With dongle

Without dongle

MIL

Security indicator

MIL

Security indicator

NATS malfunction
(except dongle control
unit) is detected

—

6 times blinking
Staying ON after ignition
switch is turned ON

—

Staying ON

Only malfunction of
dongle control unit is
detected.

—

Staying ON for about 15
minutes after ignition
switch is turned ON

—

—

Malfunction of NATS and
engine related parts are
detected.

Staying ON

6 times blinking
Staying ON after ignition
switch is turned ON

Staying ON

Staying ON

Only engine related part
malfunction is detected.

Staying ON

—

Staying ON

—

Just after initialization of
NATS

—

6 times blinking

—

—

I

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 CONSULT-II
operation instruction, NATS.

I

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 iden-
tification. Therefore, be sure to receive all keys and the PIN code from vehicle owner.

NATS (Nissan Anti-Theft System)

EL-186