NISSAN PRIMERA 1999 Electronic Repair Manual

FAN CONTROL SWITCH
Manual control of the blower speed. Four speeds are available for manual control (as shown on the display
screen):
low
I, medium lowII, medium highIII, highIIII
MODE CONTROL KNOB
This knob controls outlet air flow.
In ªDEFº (
) mode, the intake door is set to ªFRESHº, and the A/C on.
AUTO SWITCH
The air mix door, and blower speed are automatically controlled so that the in-vehicle temperature will reach,
and be maintained at the set temperature selected by the operator.
TEMPERATURE CONTROL SWITCH (POTENTIO TEMPERATURE CONTROL)
Increases or decreases the set temperature.
RECIRCULATION (REC) SWITCH
OFF position: Outside air is drawn into the passenger compartment.
ON position: Interior air is recirculated inside the vehicle.
RECIRC is canceled when DEF mode is selected.
AIR CONDITIONING SWITCH
The air conditioner switch controls the A/C system. When the switch is depressed with the fan ON, the
compressor will turn ON. The display screen indicates ªA/Cº.
A/C switch will turn on when DEF mode is selected.
The air conditioner cooling function operates only when the engine is running.
DESCRIPTIONAUTO
Control Operation (Cont'd)
HA-22

Discharge Air Flow
KHA113
p1: Ventilation
p2: Foot
p3: Defroster
H: Air flow in REC position
p3p3p3
p3
VentFoot
p3To defroster
p2To floor
p2To floor
Foot and defroster
p3To defroster
p2To floor
p2To floorOutside air
Defroster
p3To defroster
Outside air
p1To ventilator
Defroster door
Fresh vent door
Heater core
Intake airH
Intake door Air mix door Floor door
Ventilator door
Bi-level
p1To ventilator
p2To floor
p2To floor
This illustration is for LHD models.
The layout for RHD models issymmetrically opposite.Outside air
Air passed through heater core
Mixed air (
+)
Air not passed through heater core
p2
Outside air
DESCRIPTIONAUTO
HA-23

Operational Check
The purpose of the operational check is to confirm that the sys-
tem operates as it should. The systems which are checked are
the blower, mode (discharge air), intake air, temperature
decrease, temperature increase.
CONDITIONS:
Engine running at normal operating temperature.
PROCEDURE:
1. Check blower
1) Turn fan control knob to 1-speed.
Blower should operate on 1-speed.
2) Then turn fan control knob to 2-speed.
3) Continue checking blower speed until all four speeds are
checked.
4) Leave blower on 4-speed.
2. Check discharge air
1) Turn mode control knob.
2) Confirm that discharge air comes out according to the air
distribution table at left.
Refer to ªDischarge Air Flowº in ªDESCRIPTIONº (HA-23).
KHA106
KHA107
KHA032 Discharge airflow
Switch
mode/
indicatorAiroutlet/distribution
Face Foot Defroster
100% Ð Ð
60% 40% Ð
15%* 65% 20%
15%* 55% 30%
15%* Ð 85%
* Face air from SIDE VENT only
TROUBLE DIAGNOSESHEATER
HA-24

3. Check recirculation
1) Press recirculation switch.
Recirculation indicator should light.
2) Listen for intake door position change (you should hear
blower sound change slightly).
4. Check temperature decrease
1) Turn temperature control knob to full cold.
2) Check for cold air at discharge air outlets.
5. Check temperature increase
1) Turn temperature control knob to full hot.
2) Check for hot air at discharge air outlets.
KHA108
KHA109
KHA110
TROUBLE DIAGNOSESHEATER
Operational Check (Cont'd)
HA-25

How to Perform Trouble Diagnoses for Quick
and Accurate Repair
WORK FLOW
CHECK INFReference item
LISTEN TO CUSTOMER COMPLAINT AND CONFIRM
BY PERFORMING OPERATIONAL CHECK.FOperational check
(Refer to HA-24.)
Symptom Chart (Refer
to HA-28.)
INVESTIGATE ITEMS YOU SHOULD CARRY OUT
RELATED TO EACH SYMPTOM.FSymptom Chart
(Refer to HA-28.)
EELIMINATE GOOD SYSTEM(S)/PART(S).FPreliminary Check
(Refer to HA-30.)
CHECK MAIN POWER SUPPLY AND GROUND CIR-
CUITS.FMain Power Supply and
Ground Circuit Check
(Refer to HA-51.)
lDiagnostic Proce-
dure(s) (Refer to
HA-32.)
lCircuit Diagram
(Refer to HA-41.)
EELIMINATE GOOD PART(S)/HARNESS(ES)/
CONNECTOR(S) ELECTRICALLY.FHarness layout (Refer
to ªHARNESS LAYOUTº
in EL section for details.
Malfunctioning
harness(es)/
connector(s)Malfunctioning
part(s)
INSPECT EACH COM-
PONENT.
FElectrical Components
Inspection
(Refer to HA-78.)
REPAIR.
H
REPAIR/REPLACE.
NGFINAL CHECK
OK
CHECK OUT
H
H
H
H
H
H
HH
H
H
TROUBLE DIAGNOSESAUTO
HA-26

NOTE
TROUBLE DIAGNOSESAUTO
HA-27

Symptom Chart
DIAGNOSTIC TABLE
PROCEDURE
Preliminary Check
Diagnostic ProcedureMain Power Supply
and Ground Circuit
Check
REFERENCE PAGE
HA-30
HA-31
HA-32
HA-52
HA-56
HA-57
HA-61
HA-65
HA-66
HA-68
HA-69
HA-70
HA-74
HA-75
HA-76
HA-77
HA-51
HA-51
HA-51
HA-51
SYMPTOM
Preliminary check 1
Preliminary check 2
Preliminary check 3
Diagnostic Procedure 1
Diagnostic Procedure 2
Diagnostic Procedure 3
Diagnostic Procedure 4
Diagnostic Procedure 5
Diagnostic Procedure 6
Diagnostic Procedure 7
Diagnostic Procedure 9
Diagnostic Procedure 10
Diagnostic Procedure 11
Diagnostic Procedure 12
Diagnostic Procedure 13
Diagnostic Procedure 14
15A Fuses
7.5A Fuse
A/C control panel
Auto amp.
A/C does not blow cold air.q q q qqqq
Blower motor does not rotate at all.
(Fan switch [AUTO] [1] [2] [3] [4])
qq
Blower motor does not rotate at all when the
fan speed is in AUTO. (It operates in 1, 2, 3
or 4-speed.)
qq q
Blower motor fan speed does not change
when fan speed is in AUTO. (Fan speed is
fixed in Hi or MH.)
qq q
Blower motor fan speed does not change
when fan speed is in AUTO. (Fan speed is
fixed in LO.)
qq q
Starting fan speed control does not operate.
qq
There is too much difference between setting
temp. on P.T.C. and in-vehicle temp.
qq
Air mix door motor does not operate nor-
mally.
qq
Intake door does not change in VENT, B/L
FOOT DEF or FOOT mode.
q
Magnetic clutch does not engage when A/C
switch and fan switch are ON.
q
Ambient sensor circuit is open or shorted.
qq
In-vehicle sensor circuit is open or shorted.
qq
Sunload sensor circuit is open or shorted.
qq
Thermal transmitter circuit is open or
shorted.
qq
Illumination or indicators of control unit do
not come on.qq
Noise
,: The number means checking order.
q: As for the order of inspection, refer to each flow chart. (It depends on malfunctioning portion.)
TROUBLE DIAGNOSESAUTO
HA-28

Electrical Components Inspection
Ð
Ð
Ð
Ð
Ð
HA-84
HA-93
HA-94
HA-81
HA-51
HA-86
HA-85
HA-86Refer to
EL section.HA-87
HA-98
HA-98
HA-98
HA-98
HA-80
HA-79
HA-70
HA-113Refer to
EC section.
Refer to
EL section.Ð Blower motor
Fan resistor
Control
unit
Air mix door
PBR
Intake door motor
Auto amp.
Ambient sensor
In-vehicle sensor
Sunload sensor
Thermal transmitter
A/C relay
LO relay
ML relay
MH relay
HI relay
Thermo control amp.
Pressure switch/sensor
Com-
pressor
ECM
Illumination system
Harness A/C switch
REC switch
Fan switch
PTC
Magnetic clutch
Thermal protector
q qq qqqqqqqqq q qqqq q
qq qq
q q q q qqqq q
qq q q qq q
qq q q q q q
qq q q qq
qqq qqqqq
qq qqqqq
qqq
q q q qqqqq q
qq
qq
qq
qq
qqqqq
TROUBLE DIAGNOSESAUTO
Symptom Chart (Cont'd)
HA-29

Checking Resistor
Checking resistors are used for trouble diagnoses of blower
motor operation and air mix door motor operation. Use checking
resistor when inspecting portions with C/R
*1, C/R*2 in flow
chart.
CAUTION:
Select checking resistors which have resistance values cor-
responding with those indicated in table below, and connect
to respective sensors.
Checking
resistorAmbient
sensorIn-vehicle
sensorWattage
Blower motor opera-
tion checkC/R
*1
1,000W1,500W
1/4W
Air mix door motor
operation checkC/R
*22,490W
1. Disconnect ambient sensor and in-vehicle sensor harness
connectors.
2. Connect checking resistors to ambient sensor harness con-
nector and in-vehicle sensor harness connector when
inspecting portions with C/R
*1, C/R*2 in flow chart in
trouble diagnoses.
3. Turn ignition switch ON.
4. Turn A/C switch ON.
5. Turn VENT mode.
6. Keep sunload sensor away from sunlight by covering it.
Preliminary Check
PRELIMINARY CHECK 1
Intake door is not set at ªFRESHº.
Is intake door in ªFreshº position when
REC switch is turned from ON to OFF
with ignition switch at ON?
(Can you hear air moving from the
intake unit?)
Ye s
ENo
Go toDiagnostic Pro-
cedure 9 (HA-69).
Is intake door in ªRECº position when
REC switch is turned from OFF to ON
with ignition switch at ON?
(Can you hear air moving from the
intake unit?)
Ye s
ENo
Go toDiagnostic Pro-
cedure 9 (HA-69).
INSPECTION END
H
H
TROUBLE DIAGNOSESAUTO
HA-30

PRELIMINARY CHECK 2
A/C does not blow cold air.
DOES AIR FLOW FROM
VENTS?
Condition
lEngine running at operating
temperature.
lIgnition switch, A/C switch, and
fan switch are ON.
lMode control knob is in VENT
mode and temperature control
knob is in full cold position.
Ye s
ENo
IS BLOWER MOTOR OPERAT-
ING NORMALLY?
Ye s N o
CHECK
BLOWER
MOTOR
OPERATION.
Go toDiag-
nostic Proce-
dure 1
(HA-52).
CHECK COMPRESSOR BELT
TENSION.
Refer to ªChecking Drive Beltsº in
MA section.
NG OK
FNG
CHECK COMPRESSOR OPERA-
TION.
OKCHECK FOR EVAPORATOR
COIL FREEZE UP.
Remove intake unit. Check if
evaporator freezes.
NG
(Freezes up.)OK
(Does not
freeze up.)
Adjust or
replace com-
pressor belt.
Refer to MA
section
(ªENGINE
MAINTE-
NANCEº).
CHECK REFRIGERATION
CYCLE PRESSURE WITH
RECOVERY/RECYCLING
EQUIPMENT CONNECTED.
Refer to Performance Chart.
NG OKCHECK VEN-
TILATOR
DUCT FOR
AIR LEAKS.
CHECK AMOUNT OF REFRIGER-
ANT.
Check amount of refrigerant using
refrigerant recovery & recharging
equipment.
OK NGGo toPerfor-
mance Test
Diagnoses.
CHECK THERMO CONTROL
AMP. AND A/C RELAY OPERA-
TION.
Go to Diagnos-
tic Procedure
10 (HA-70).CHECK FOR
REFRIGER-
ANT LEAKS.CHECK WATER COCK OPERA-
TION.
Warm up engine before checking.
OK
ENG
Adjust or replace water cock.
CHECK VENTILATOR DUCT FOR
AIR LEAKS.FOK
CHECK EVAPORATOR OUTLET
AIR TEMPERATURE.
Refer to Performance Chart.
NG
CHECK AIR MIX DOOR OPERA-
TION.
(Refer to HA-90.)
H
HH
HHH
HHH
HHH
H
H
TROUBLE DIAGNOSESAUTO
Preliminary Check (Cont'd)
HA-31