relay NISSAN GT-R 1998 Workshop Manual

FULLY AUTOMATIC AIR CONDITIONER
Circuit
Diagram
Blower tan motor relay
Rear defogger
A Combination meter (meter UU) output * I Rear defogger relay - Rear defogger display inpui
I Compressor
Blower
fan driver signal Refrigerant Pressure sensor
Actuator driver power source
lntake driver
1 lntake driver 2 lntake driver 3 lntake driver 4
lntake door actuator NP ON output NP display input
Lighting
SW (1 step)
Y-lkEka Air mix door actuator
Illumination
power
source
Air mix driver 1 Air mrx drive: 2 Air mix driver 3 Air mix driver 4
Mode driver 1 1 Mode driver 2 Mode driver 3 Mode driver 4
INCAR In-vehicle sensor
Ambienl sensor
Sunload sensor
AM B
Water TEMP
SUN
INTAKE
Sensor around
lluminatron
groun:!
iND
Automatic
amp!iher

FULLY AUTOMATIC AIR CONDITIONER
Magnet Clutch System Check
MAGNET CLUTCH
Disconnect the compressor connector. Apply approx. 12V to the compressor to check the magnet clutch
operation.
/;sn
AIR CONDITIONER RELAY QJg
Remove the air conditioner relay. Apply approx. 12V between the air conditioner relay terminals No. 1 and
2. Check the relay operation sound. Ec Check the continuity between terminals No. 3 and 5.
REFRIGERANT CHARGE AMOUNT AT
Connect the manifold gauge to the vehicle side service valve.
Check that the lower pressure side (gauge pressure) is more than approx. 0.1 8 MPa (1.8 kg/cm2.G). BR
ECM
Start the engine, and short-circuit the ECM terminal No. 14 to the ground. Check the magnet clutch operation.
INTAKE AIR TEMPERATURE SENSOR
Start the engine, and short-circuit the intake air temperature sensor terminal No. 1 to the ground. Check the Rs
maanet clutch o~eration.
Blower Fan Motor System Check
BLOWER FAN MOTOR
Disconnect the blower fan motor connector. Short-circuit the blower fan motor terminals No. 2 and 5 to El!, (
the ground. Apply approx. 12V to the terminal No. 6, and check the motor operation.
Connect the blower fan motor connector. Turn the ignition switch to the ON position, and change the fan sD
switch from 1st to 4th. Check the blower fan motor terminal No. 5 with an oscilloscope. When the termi-
nal No.
5 is normal according to the following table and the fan airflow does not change, this indicates a
faulty blower fan motor.
When the terminal No.
5 results differ from the following table and the fan airflow does not change, this
indicates either a faulty harness between the blower fan motor and automatic amplifier, or a faulty auto-
matic amplifier.

FULLY AUTOMATIC AIR CONDITIONER
Blower Fan Motor System Check (Cont'd)
Terminal No. 5 (oscilloscope)
1 st speed
TI : Approx. 3.2 ms
Duty ratio: Approx. 20% 2nd
speed
3rd speed
T2: Approx. 2.2
ms
Duty ratio: Approx. 45%
T3: Approx. 1.44 ms
Duty ratio: bprox. 64%
4th speed
Duty ratio: Approx. 100%
Approx. 4 ms-Tx Duty ratio = Approx. 4 ms x 100%
BLOWER FAN RELAY
Remove the blower fan relay. Apply approx. 12V to the blower fan relay terminals No. 1 and 2. Check the
relay operation sound.
Check the continuity between terminals No.
3 and 5.
Actuator System Check
DOOR ACTUATOR MOTOR
Disconnect every door actuator connector. Check the continuity between each door actuator terminals No. 3
and 1, 3 and 2, 3 and 5, and 3 and 6.
DOOR ACTUATOR HARNESS
Check the continuity between the automatic amplifier and every actuator.
Check that there is no short-circuit between actuator driver signals. (If there is a short-circuit, the actua-
tors
will vibrate during operation.)

CENTRAL DOOR LOCK SYSTEM
Component
Parts Location
Door lock relay
LOCK -
Door lock relay
connector
1 LOCK 1
TK20 I I 5\41 1 (Brown) 1 11el j I 1
Combination meter
(Meter C/U) connector
I
Circuit Diagram
Driver door lock
Remote control entry
SW signal C/U connector
Lock signal
18. Unlock sign311 5 T 1
PMI main SW
(Central door lock SW)
----- I . RH door1
actuator 1 I I I Rear LH door I lock actuator I I I,,,,,,,------J
Driver door lock
actuator SW
P/'W main SW connector PNV main SW connector
(2-door Coupe) 1 (4-door Sedan) OCC3324 C
Combination Meter (meter control unit) Input/
Output Signal Specifications
-
I
. . 4 1 Driver door lock switch signal I
Specification
Approx. OV
Locked (OFF)
5
18
55
56
60
Operation or condition
Unlocked (ON1
Terminal No.
Approx.
5V
Signal name
Central door lock switch unlock signal
Central door lock switch lock signal
Ground Passenger and rear
RH 8 LH door lock
actuator lock signal
Passenger and rear RH & LH door lock actuator unlock siqnal Unlocked
(ON)
Operation other than above (OFF)
Locked (ON)
Operation other than above (OFF)
-
Central door lock switch is locked.
Central door lock switch is unlocked. Approx.
OV
Approx. 5V
Approx.
OV
Approx. 5V
Approx.
OV
Changes from approx. 12 to OV and back
to approx. 12V.
Changes from approx.
12 to OV and back
to approx. 12V.

CENTRAL DOOR LOCK SYSTEM
Symptom
Passenger door lock and rear
RH & LH door locks do not lock or unlock with the
central door lock switch.
Passenger door lock, rear
RH door lock,
or rear LH dooc lock do not lock or unlock
with the central door lock switch.
Passenger door lock and rear
RH & LH door locks do not lock or unlock with the
driver door lock knob. (They operate
properly with the central door lock switch.)
Inspection before Trouble Diagnoses
Check that components connectors are properly connected.
Trouble Diagnoses
SYMPTOM CHART
Malfunctioning item
Door lock relay circuit Possible
cause E8G Faulty power window main switch (central door lock switch)
Power window main switch circuit
Faulty door lock relay
Faulty door lock relay to combination meter (meter control unit)
BR harness
0 Faulty power window main switch (central door lock switch) to
combination meter (meter control unit) harness
Faulty power window main switch (central door lock switch) ground
circuit
I Faulty door lock relay to door lock actuator harness
Door lock actuator circuit
Combination meter
(meter control unit)
0 Faulty door lock actuator Faulty door lock actuator to door lock relay harness
0 Faulty combination meter (meter control unit) ST
Driver door lock switch circuit
0 Faulty driver door lock switch . Faulty driver door lock switch to combination meter (meter control
unit) harness
Combination meter (meter control unit)
Faulty driver door lock switch ground circuit
Faulty combination meter (meter control unit) m

I Sunroof motor assembly 1 Component Parts Location
I Sunroof switch < OCEM57DI
Circuit Diagram
CIB PMl relay
Sunroof motor assembly (Fully-closed position)
I I Limit SW 2 I -1 I i
3
5
1 1 -- LL
1 --
CLOSE relay - I ~irnitsw~ I
Sunroof SW
Slide SW
CLOSE 5--1
Sunroof Switch and Sunroof Motor Assembly
InputlOutput Signal Specifications
-
Measuring condition
I I
- Operation
Terminal No.
1
2
Ignition switch
3
4
5
ON
ON
'lased
ON
ON
ON Approx.
12V
OV
~~ll~ closed position to fully open position
Approx. 2V
OV
Approx. OV OV
OV
'Pen
Position
to fully closed
position
Approx.
OV (Motor is running.)
Approx. 2V
Approx. OV OV
OV
Fully closed position
to tilt UP position
Approx.
12V
Approx. OV (Motor is running.)
Approx.
OV
Tilt UP position to
fully closed position
Approx.
OV (Motor is running.)
12'
Approx. 12V
Approx.
OV (Motor is running.)
ov
OV
Approx. OV
ov
OV
Approx. OV

AUTO LIGHT SYSTEM
Component
Parts Location Inside the meter
-4 Auto light control unit
Auto Light Control Unit InputlOutput Signal
Specifications
Terminal No. Measuring
condition
Operation or condition
I
Signal name Specification
Ignition switch
I Light is applied to the I Approx. 12V
liaht sensor.
Tail lamp relay control
signal
Speedometer is in operation. (Vehicle speed is
approximately 40
kmlh.)
Lighting switch: AUTO
Vehicle speed signal (2 pulses)
Light is applied to the
liaht
sensor.
I
4
Light is not applied to
the light sensor.
Approx. OV
Approx.
OV
Navigation screen
dimming signal Liahtina
switch: 1 ST
- I I
I
Light is not applied to
the light sensor.
ignition power supply Approx. 12V
I - I
I Light
is applied to the I Approx. 12V
liaht sensor. Approx. 12V
Headlamp
relay con-
trol signal Lighting
switch: AUTO
Lighting switch AUTO
signal Lighting switch
ACC -
Light is not applied to
the light sensor.
Ground Approx.
OV
OFF
AUTO Approx. 12V
Approx. OV
Driver door switch sig-
n
al
ACC Approx.
OV
Approx.
OV
Approx. 12V
-
ACC power supply Driver
door switch
ACC ON
(Open)
OFF (Closed)
- I Approx. 12V

AUTO LIGHT SYSTEM
Circuit Diagram
Xenon
headlamp
relay
To clearance
lamp and
tail lamp
I---- I : High-voltage parts ----- EL-2163D
Trouble Diagnoses
SYMPTOM CHART
Symptom I Possible cause
I a Faulty auto light control unit power supply or ground harnesi
I Faulty auto light control unit
When outside
is dark, neither small lamps nor headlamps
tum
ON
by
auto light operation. [Lighting switch
(1ST
and 2ND)
is normal.]
When outside is dark, small lamps turn ON but headlamps do not turn
Faulty lighting switch to auto light control unit harness
ON by auto light operation. [Lighting switch (1 ST and 2ND) is normal.] Faulty auto light control unit
0 Faulty lighting switch Faulty lighting switch to auto light control unit harness a Faulty lighting switch ground harness
When outside is dark, headlamps turn ON but small lamps do not turn
ON by auto light operation. [Lighting switch
(1ST
and 2ND) is normal.]
Faulty lighting switch to auto light control unit hamess Faulty auto light control unit
a Neither headlamps nor small lamps turn OFF when the driver door is
opened with the ignition switch at ACC. a Headlamps and small lamps turn OFF when the ignition switch is
turned to ACC with the driver door closed.
0 While the vehicle is driven at night, headlamps go off momentarily
~~- - - pp a Faulty door switch a Faulty door switch to auto light control unit harness a Faulty door switch ground harness 0 Faulty auto light control unit
when it passes under street lamps.
0 While the vehicle is driven in the early morning or evening, headlamps
turn ON momentarily when it passes under an overpass or through a Faulty speedometer to auto light control unit harness a Faulty auto light control unit
building shadows.
During the day, neither small lamps nor headlamps turn OFF. During the day, headlamps tum OFF but small lamps do not turn OFF. a Faulty auto light control unit

XENON HEADLAMP SYSTEM
Trouble Diagnoses
DESCRIPTION
Problems with xenon headlamps are as follows:
They do not light up.
They blink.
GD
They are not bright enough.
In most cases the problems above are caused by faulty xenon bulbs.
There might be the possibility that the problems are caused by faulty HID control unit or lamp sockets.
ec
Follow the diagnostic procedure to determine what causes the problem.
PRECAUTIONS AT
Connect or disconnect connectors with the lighting switch OFF.
Do not touch harnesses, HID control unit, internal lamp, or metal part of the lamp while the lamps are
ON B2
(Lighting switch is ON).
Before verifying that the lamps are ON, install the parts to the vehicle temporarily and connect the battery
cable with
the connector on the vehicle. ST
If the electrical system is suspected to be the cause of the symptom, check for blown fuse or fusible link,
broken connectors, disconnected terminals, or faulty engagement.
Do not use wet hands when performing the trouble diagnoses.
F@
CIRCUIT DIAGRAM
, MA Xenon
headlamp
relay
To clearance
JJ$Rkj
lamp and
tail lamp
Headlamp
1 -- - -1 : High-voltage parts
Driver door SM
CAUTION:
0 Do not use a tester to diagnose the HID control unit circuit.
0 Do not disassemble the HID control unit and harnesses (bulb socket harness and control unit har-
ness).
0 Immediately after the headlamps turn ON, brightness and emission color vary. This is a normal
condition.
When a bulb has reached the end of its life, the brightness becomes extremely low, the bulb con-
tinues to blink, or the light looks reddish.

XENON HEADLAMP SYSTEM
Trouble Diagnoses (Cont'd)
DIAGNOSTIC PROCEDURE
I
FUSE, FUSIBLE LINK, AND XENON Fuse, fusible link, or xenon
HEADLAMP RELAY CHECK headlamp relay is faulty.
CONNECTOR CHECK ON THE VEHICLE Harness on the vehicle is
FOR BATTERY VOLTAGE faulty.
With lighting switch ON, check HID control
unit connector on the vehicle for battery
I voltage. I
OK
XENON HEADLAMP BULB REPLACE- Xenon bulb is faulty.
MENT
Replace the xenon headiamp bulb with a
known
good bulb and check for proper
operation.
HID CONTROL UNIT REPLACEMENT HID control unit is faulty.
Install a known good
HID control unit to
I
the xenon headlarnp and check for proper
operation.
NG
XENON HEADLAMP HOUSING ASSEM- OK, BLY REPLACEMENT
Install a known good xenon headlamp
housing assembly to the xenon
headlamp
and check for proper operation.
---
Starter in xenon headlamp
housing (boost circuit) is
faulty. (Xenon
headlamp housing
assembly
is faulty.)