NISSAN PRIMERA 1999 Electronic Repair Manual

Trouble Diagnosis
The Timer Control Unit includes software to help during development testing, manufacturing and service.
It allows the technician to put it into Diagnostic Mode. In this mode, all switch inputs can be tested for con-
tinuity and if so equipped, alarm triggers identified.
When the time control unit is in Diagnostic Mode, the control unit tests the component and indicate the result
by the hazard lamp flashing.
On vehicles with a theft warning system, the TCU will first indicate the source of the last three alarm trig-
gers by flashing the hazard lamp. (Refer to“THEFT WARNING SYSTEM”, EL-311.)
START
NOTE: Before entering diagnostic mode, make sure the vehicle is fully unlocked,
the ignition is switched off and the hazard switch is off.
Press the rear defogger switch exactly 6 times within 10 seconds.
NG
The hazard lamp flash at 3Hz for 1 second to confirm step I.
OK
Within 10 seconds after confirmation of step I, turn the ignition ON, for at least 2 seconds.
NG
The hazard lamp flash at 3Hz for 1 second to confirm step II.
OK
Within 10 seconds after confirmation of step II, turn the ignition off,
remove the ignition key and press the rear defogger switch for at least 5 seconds.
NGThe hazard lamp flash at 3Hz for 3 seconds to confirm diagnostic mode is entered.






TIME CONTROL UNIT (TCU)
EL-309

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 ultra-
sonic model)Hazards flash once Rear doors status signal
Ultrasonics cancel switch is pressed (with ultra-
sonic 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 posi-
tion from offHazards flash once Tail lamp signal
Key put in ignition from out Hazards flash once Key in detect signal
Central unlock/Trunk release switch is pressed Hazards flash once Central unlock/Trunk release signal
External trunk release switch pressed from off Hazards flash once External trunk release switch signal
*) Hazards may flash a second time because of Driver’s door status signal change. The min. delay time between flash actions is
100ms.
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 turn-
ing the ignition to“ON”. The hazard lamp will flash at 3Hz for 3 seconds to confirm that Diagnostic Mode
has been switched off.
TIME CONTROL UNIT (TCU)
Trouble Diagnosis (Cont’d)
EL-310

Components Parts and Harness Connector
Location
NEL529 Door unlock sensor RH
Ultrasonic sub sensor
Door unlock sensor
Front door switch RH
Security indicator light
Hood switchRear door switch RH
Ultra sonic sensor
Theft warning horn
Rear door switch
Door unlock sensor LH
Door key cylinder
switch
Door unlock sensor
Front door switch LH
Ultrasonic
cancel switch
Time control unit
Theft warning horn relay
.
Door key cylinder switch
Door unlock sensor
Ultrasonic
sub sensorUltrasonic sensor
Ultrasonic cancel switch
.Trunk room/luggage
room lamp switchTime control unit
Hood switch
Theft
warning
horn
Trunk room/Luggange room lamp switch
THEFT WARNING SYSTEM
EL-311

System Description
OPERATION FLOW
The SECURITY indicator can be operated by both the IMMU (for NATS) and the TCU (for Theft Warning).
The flow chart shows both operations.
NEL568 SYSTEM phase
Ignition“ON”
Disarmed
Ignition“ACC”
or“LOCK”Dis-
armed
Ignition“ACC”or
“LOCK”Pressing
Ultrasonic Cancel
Switch
Ignition“LOCK”
Pre-armed
(4/5DR)
Ignition“LOCK”
Pre-armed
(Wagon)
Ignition“LOCK”
Armed
Ignition“LOCK”
DisarmedTheft warning (TCU) NATS (IMMU)
T1 (0.2 sec)
T2 (2.4 sec)
T3 (6 sec)
T4 (30 sec)
f=8Mhz
T4 (30 sec)
T5 (1 sec)
THEFT WARNING SYSTEM
EL-312

SETTING THE THEFT WARNING SYSTEM
Initial condition
(1) Close all doors.
(2) Close hood and trunk lid.
Pre-armed phase and armed phase
The theft warning system turns into the“pre-armed”phase when hood, trunk lid and all doors are closed
and locked by key or multi-remote controller. (The security indicator lamp blinks intermittently for 30 sec-
onds.)
After about 30 seconds, the system automatically shifts into the“armed”phase (the system is set).
CANCELING THE SET THEFT WARNING SYSTEM
When the following (a) or (b) operation is performed, the armed phase is canceled.
(a) Unlock the doors with the multi-remote controller.
(b) Insert key in ignition key cylinder and turn it to ON. Then NATS IMMU will send a disarm signal to the
time control unit.
ACTIVATING THE ALARM OPERATION OF THE THEFT WARNING SYSTEM
Make sure the system is in the armed phase. When the following operation (a) (b) (c) (d) or (e)is performed,
the system sounds the horns and flashes the hazard lamp for about 30 seconds.
(a) Engine hood, trunk lid or any doors is opened before unlocking door with the multi-remote controller.
(b) A door is unlocked without using the multi-remote controller.
(c) The ignition is switched ON without using a NATS registered key.
(d) The ultra sonic sensing is triggered.
(e) A rear side or rear screen breakage is detected (Wagon).
POWER SUPPLY AND GROUND CIRCUIT
Power is supplied at all times.

Through 10A fuse [No.16 , located in the fuse block (J/B)]

to security indicator lamp terminal
2.
Power is supplied at all times

through 10A fuse [No.5 , located in the fuse block (J/B)]

to time control unit terminal
9.
With the ignition switch in the ON or START position, power is supplied

through 10A fuse [No.26 , located in the fuse block (J/B)]

to time control unit terminal
1.
Ground is supplied

to time control unit terminal
16.

through body groundsM6,M28andM26.
INITIAL CONDITION TO ARM THE SYSTEM
The operation of the theft warning system is controlled by all the doors, hood and trunk lid.
To activate the theft warning system, the time control unit must receive signals indicating all the doors, hood
and trunk lid are closed and the doors are locked.
When a door is open, time control unit terminal

6or
7receives a ground signal from each door switch.
When a door is unlocked, time control unit terminal

25,
35or
36receives a ground signal from terminal

5of each door unlock sensor.
When the hood is open, time control unit terminal

32receives a ground signal

from terminal
1of the hood switch

through body groundsE11andE37.
When the trunk lid is open, time control unit terminal

33receives a ground signal

from terminal
1of the trunk room lamp switch

through body groundsB18andB27.
When the back door, trunk or tail gate is open, time control unit terminal

33receives a ground signal

from terminal
1of the luggage room lamp switch

through body groundsB48andD110.
THEFT WARNING SYSTEM
System Description (Cont’d)
EL-313

THEFT WARNING SYSTEM ARMING (With key or remote controller used to lock doors)
If the key is used to lock doors, time control unit terminal
29receives a ground signal

from terminal
2of the key cylinder switch

through body groundsB18andB27.
If this signal or lock signal from remote controller is received by the time control unit, the theft warning sys-
tem will arm automatically.
When arming the theft warning system, time control unit terminal

18supplies ground intermittently to ter-
minal

1of the security indicator lamp. The security lamp will blink intermittently for approximately 30 sec-
onds (and then blink every 2.6 seconds, due to NATS).
Now the theft warning system is in armed phase.
THEFT WARNING SYSTEM ALARM OPERATION
The theft warning system is triggered by

opening a door

opening the trunk lid or back door

opening the hood

unlocking door without using the multi-remote controller

switching the ignition ON without a NATS registered key

triggering the ultra sonic sensors

smashing the back door or rear side quarter window (wagon model only).
Once the theft warning system is in armed phase, if the time control unit receives a signal at terminal

25,

35,
36(door unlock sensor),
6,
7(door switch),
33(trunk room lamp switch or luggage room lamp
switch),

32(hood switch),
31(smash sensor) or
17(ultra sonic sensor) the theft warning system will be
triggered. The hazard lamps flash and the horn sounds intermittently.
Power is supplied at all times

through 10A fuse [No.16 , located in the fuse block (J/B)].

to theft warning relay terminal
2.
If the theft warning system is triggered, ground is supplied

from terminal
43of the time control unit

to theft warning relay terminal
1.
The hazard lamps flash and the horn sounds intermittently.
The alarm automatically turns off after 30 seconds but will reactivate if the vehicle is tampered with again,
or if the initial cause remains present.
THEFT WARNING SYSTEM ALARM DISARMING
The theft warning system alarm operation can be deactivated by either unlocking the vehicle with the remote
controller, or turning the ignition to the“ON”position with a registered NATS key.
SMASH SENSOR
The smash sensor will trigger the alarm when the rear side or rear screen is broken. There are three wind-
shield protected:
1. Back door window. Sensor circuit is bonded to the glass.
2. Rear side quarter windows (one each side). Sensor circuit is bonded to the glass.
All three sensor are wired in series. By breaking any of the three windshields (sensor circuit open), the alarm
will sound.
THEFT WARNING SYSTEM
System Description (Cont’d)
EL-314

Schematic
YEL924C
THEFT WARNING SYSTEM
EL-315

Wiring Diagram—THEFT—
YEL925C
THEFT WARNING SYSTEM
EL-316

E11
32
Y/B
B12
1
E12
2
B
E37
GYW B15
7
Y/B
6
Y
21
P
2
17
PU
8
20
B/Y
4 Y3
5
L4
SB
21
3
G
5 P6 B/Y
9 Y/B
Y/B
P PU B/Y
LSBG
WW
W
EL-THEFT-02
BB
E12B29
B15 B57
E115
12
B29
B57
3534 33 32 3130
29 2827
26 25B12362322 21 2019
18 1724
3 2 14567
810911 12 13 14 15 16
1
23456
12345678
YEL358B
TIME
CONTROL
UNIT
ULTRASONIC
SENSOR
HOOD
SWITCHULTRASONIC
SUB SENSOR
CLOSEDOPEN
THEFT WARNING SYSTEM
Wiring Diagram—THEFT—(Cont’d)
EL-317

YEL927C
THEFT WARNING SYSTEM
Wiring Diagram—THEFT—(Cont’d)
EL-318