ECO mode INFINITI QX4 2001 Factory Service Manual

RHA328HA
DISPLAY SCREENNBHA0016S01Displays the operational status of the system.
AUTO SWITCHNBHA0016S02The compressor, intake doors, air mix door, outlet doors, 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.
ECON SWITCHNBHA0016S03By pressing the ECON switch, the display should indicate ECON and the compressor always turns OFF. With
the compressor OFF, the system will not remove heat (cool) or de-humidify. The system will maintain the in-
vehicle temperature at the set temperature when the set temperature is above the ambient (outside) tempera-
ture. The system will set the intake doors to the outside air position.
TEMPERATURE SWITCH (POTENTIO TEMPERATURE CONTROL) WITHOUT NAVIGATION
SYSTEM
NBHA0016S04Increases or decreases the set temperature.
OFF SWITCHNBHA0016S05The compressor and blower are OFF, the intake doors are set to the outside air position, and the air outlet
doors are set to the foot (80% foot and 20% defrost) position.
FAN SWITCHNBHA0016S06Manually controls the blower speed. Four speeds are available for manual control (as shown on the display
screen):
low
, medium low, medium high, high
RECIRCULATION (REC) SWITCHNBHA0016S07OFF position: Outside air is drawn into the passenger compartment.
ON position: Interior air is recirculated inside the vehicle.
DEFROSTER (DEF) SWITCHNBHA0016S08Positions the air outlet doors to the defrost position. Also positions the intake doors to the outside air position.
MODE SWITCHNBHA0016S09Controls the air discharge outlets.
TEMPERATURE DIAL (POTENTIO TEMPERATURE CONTROL) WITH NAVIGATION SYSTEMNBHA0016S10Increases or decreases the set temperature.
AMB (AMBIENT) SWITCH (WITH NAVIGATION SYSTEM)NBHA0016S11Shows the ambient (outside) air temperature on the display screen for 5 seconds.
DESCRIPTION
Control Operation (Cont'd)
HA-24

System DescriptionNBHA0110SWITCHES AND THEIR CONTROL FUNCTIONSNBHA0110S01
RHA044GA
Position
or switchMODE SW DEF SW
AUTO
SWECON
SWREC SW Temperature SW
VENT B/L FOOT D/F ON OFF ON OFF
Door18.0ÉC
(65ÉF)Ð32.0ÉC
(85ÉF)
Ventila-
tor doorA BCCC
Ð AUTO AUTOÐÐ
Foot
doorABCCA Ð Ð
Defroster
doorAABCC Ð Ð
Air mix
doorÐ Ð Ð A AUTO B
Intake
doorÐ C A AUTO*1 Ð
*1: Automatically controlled when REC switch is OFF.
DESCRIPTION
System Description
HA-26

STEP-BY-STEP PROCEDURE=NBHA0021S02Without Navigation SystemNBHA0021S0201
1 SET IN SELF-DIAGNOSTIC MODE
1. Turn ignition switch ON.
2. Set in self-diagnostic mode as follows. Within 10 seconds after starting engine (ignition switch is turned ªONº.), press
switch for at least 5 seconds.
©GO TO 2.
2 STEP 1 - ALL LEDs AND SEGMENT ARE CHECKED
Do all LEDs and segments illuminate?
RHA454G
YesorNo
Ye s©GO TO 3.
No©Malfunctioning
switch, LED or fluorescent display tube.
Replace A/C auto amp.
3 VERIFY ADVANCE TO SELF-DIAGNOSIS STEP 2
1. Press(HOT) switch.
2. Does advance to self-diagnosis STEP 2?
YesorNo
Ye s©GO TO 4.
No©Malfunctioning
(HOT) switch.
Replace A/C auto amp.
4 VERIFY RETURN TO SELF-DIAGNOSIS STEP 1
1. Press(COLD) switch.
2. Does return to self-diagnosis STEP 1?
YesorNo
Ye s©GO TO 5.
No©Malfunctioning
(COLD) switch.
Replace A/C auto amp.
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TROUBLE DIAGNOSES
Self-diagnosis (Cont'd)
HA-45

AUXILIARY MECHANISM: TEMPERATURE SETTING TRIMMER=NBHA0021S03Without Navigation SystemNBHA0021S0301The trimmer compensates for differences in range of±3ÉC (±6ÉF) between temperature setting (displayed
digitally) and temperature felt by driver.
Operating procedures for this trimmer are as follows:
IBegin Self-diagnosis STEP 5 mode.
IPress
(fan) UP switch to set system in auxiliary mode.
IDisplay shows ª
º in auxiliary mechanism.
It takes approximately 3 seconds.
IPress either
(HOT) or(COLD) switch as desired. Temperature will change at a rate of 0.5ÉC (1ÉF)
each time a switch is pressed.
SHA197E
When battery cable is disconnected, trimmer operation is canceled. Temperature set becomes that of
initial condition, i.e. 0ÉC (0ÉF).
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TROUBLE DIAGNOSES
Self-diagnosis (Cont'd)
HA-53

STEP-BY-STEP PROCEDURENBHA0021S05With Navigation SystemNBHA0021S0501
1 SET IN SELF-DIAGNOSTIC MODE
1. Turn ignition switch ON.
2. Set in self-diagnostic mode as follows. Within 10 seconds after starting engine (ignition switch is turned ªONº.), press
switch for at least 5 seconds.
©GO TO 2.
2 STEP 1 - ALL LEDs AND DISPLAY SCREEN ARE CHECKED
When switch's LED and display are functioning properly in STEP-1, LED and display will come on.
RHA860H
OK or NG
OK©GO TO 3.
NG©Malfunctioning
switch, LED or fluorescent display tube.
Go to ªMain Power Supply and Ground Circuit Checkº, HA-72.
3 VERIFY ADVANCE TO SELF-DIAGNOSIS STEP 2
1. Turn temperature dial clockwise.
2. Does advance to self-diagnosis STEP 2?
YesorNo
Ye s©GO TO 4.
No©Malfunctioning temperature dial.
Check Display & NAVI control unit.
4 VERIFY RETURN TO SELF-DIAGNOSIS STEP 1
1. Turn temperature dial counterclockwise.
2. Does return to self-diagnosis STEP 1?
YesorNo
Ye s©GO TO 5.
No©Malfunctioning temperature dial.
Check Display & NAVI control unit.
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TROUBLE DIAGNOSES
Self-diagnosis (Cont'd)
HA-55

AUXILIARY MECHANISM: TEMPERATURE SETTING TRIMMER=NBHA0021S06With Navigation SystemNBHA0021S0601The trimmer compensates for differences in range of±3ÉC (±6ÉF) between temperature setting (displayed
digitally) and temperature felt by driver.
Operating procedures for this trimmer are as follows:
IBegin Self-diagnosis STEP 5 mode.
IPress
(fan) UP switch to set system in auxiliary mode.
IDisplay shows ª
º in auxiliary mechanism.
It takes approximately 3 seconds.
ITurn the temperature dial clockwise or counterclockwise: Temperature will change at a rate of 0.5ÉC (1ÉF).
RHA863H
When battery cable is disconnected, trimmer operation is canceled. Temperature set becomes that of
initial condition, i.e. 0ÉC (0ÉF).
TROUBLE DIAGNOSES
Self-diagnosis (Cont'd)
HA-64

How to Perform Trouble Diagnoses for Quick
and Accurate Repair
=NBHA0018WORK FLOWNBHA0018S01
SHA900E
*1: Operational Check (HA-66)
SYMPTOM TABLENBHA0018S02
Symptom Reference Page
IA/C system does not come on.IGo to Trouble Diagnosis Procedure for A/C system. HA-71
IAir outlet does not change.
IGo to Trouble Diagnosis Procedure for Mode Door Motor. (LAN) HA-75
IMode door motor does not operate nor-
mally.
IDischarge air temperature does not
change.
IGo to Trouble Diagnosis Procedure for Air Mix Door Motor. (LAN) HA-82
IAir mix door motor does not operate nor-
mally.
IIntake door does not change.
IGo to Trouble Diagnosis Procedure for Intake Door Motor. HA-87
IIntake door motor does not operate nor-
mally.
IBlower motor operation is malfunctioning.
IGo to Trouble Diagnosis Procedure for Blower Motor. HA-95
IBlower motor operation is malfunctioning
under out of starting fan speed control.
IMagnet clutch does not engage.IGo to Trouble Diagnosis Procedure for Magnet Clutch. HA-104
IInsufficient cooling.IGo to Trouble Diagnosis Procedure for Insufficient Cooling. HA-112
IInsufficient heating.IGo to Trouble Diagnosis Procedure for Insufficient Heating. HA-121
INoise.IGo to Trouble Diagnosis Procedure for Noise. HA-123
ISelf-diagnosis can not be performed.IGo to Trouble Diagnosis Procedure for Self-diagnosis. HA-124
IMemory function does not operate.IGo to Trouble Diagnosis Procedure for Memory Function. HA-126
IECON mode does not operate.IGo to Trouble Diagnosis Procedure for ECON (ECONOMY) Ð
mode.HA-128
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TROUBLE DIAGNOSES
How to Perform Trouble Diagnoses for Quick and Accurate Repair
HA-65

RHA461GA
SHA278FA
6. Check Temperature IncreaseNBHA0019S0206Without Navigation System
IPress the temperature increase button until 32ÉC (85ÉF) is
displayed.
ICheck for hot air at discharge air outlets.
If NG, go to trouble diagnosis procedure for insufficient heating
(HA-121).
If OK, continue with next check.
With Navigation System
ITurn the temperature dial clockwise until 32ÉC (85ÉF) is dis-
played.
ICheck for hot air at discharge air outlets.
If NG, go to trouble diagnosis procedure for insufficient heating
(HA-121).
If OK, continue with next check.
RHA462GA
RHA333HA
7. Check ECON (Economy) ModeNBHA0019S02071. Set the temperature 75ÉF or 25ÉC.
2. Press ECON switch.
3. Display should indicate ECON (no AUTO).
Confirm that the compressor clutch is not engaged (visual
inspection).
(Discharge air and blower speed will depend on ambient, in-
vehicle and set temperatures.)
If NG, go to trouble diagnosis procedure for ECON (Economy)
mode (HA-128).
If OK, continue with next check.
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TROUBLE DIAGNOSES
Operational Check (Cont'd)
HA-69

RHA463GA
RHA334HA
8. Check AUTO ModeNBHA0019S02081. Press AUTO switch.
2. Display should indicate AUTO (no ECON).
Confirm that the compressor clutch engages (audio or visual
inspection).
(Discharge air and blower speed will depend on ambient, in-
vehicle and set temperatures.)
If NG, go to trouble diagnosis procedure for A/C system (HA-71),
then if necessary, trouble diagnosis procedure for magnet clutch
(HA-104).
SHA286HA
9. Check Ambient Display (With Navigation System)NBHA0019S02091. Press AUTO switch.
2. Press AMB switch.
3. Display should show the outside (ambient) temperature for
approximately 5 seconds.
If NG, go to trouble diagnosis procedure for multiplex communica-
tion circuit (HA-142).
If all operational check are OK (symptom can not be duplicated),
go to ªIncident Simulation Testsº (GI section) and perform tests as
outlined to simulate driving conditions environment. If symptom
appears, refer to ªSymptom Tableº (HA-65) and perform applicable
trouble diagnosis procedures.
TROUBLE DIAGNOSES
Operational Check (Cont'd)
HA-70

6 CHECK MOTOR OPERATION
Disconnect and reconnect the motor connector and confirm the motor operation.
OK or NG
OK (Return to operate
normally)©Poor contacting the motor connector
NG (Does not operate
normally)©GO TO 7.
7 CHECK MODE DOOR MOTOR OPERATION
1. Disconnect the mode door motor and air mix door motor connector.
2. Reconnect the mode door motor and confirm the motor operation.
OK or NG
OK (Mode door motor
operates normally)©Replace the air mix door motor.
NG (Mode door motor
does not operate nor-
mally)©GO TO 8.
8 CHECK AIR MIX DOOR MOTOR OPERATION
1. Disconnect the mode door motor connector.
2. Reconnect the air mix door motor and confirm the air mix door motor operation.
OK or NG
OK (Air mix door motor
operates normally)©Replace mode door motor.
NG (Air mix door motor
does not operate nor-
mally)©Replace auto amp.
RHA505G
CONTROL LINKAGE ADJUSTMENTNBHA0091Mode DoorNBHA0091S011. Install mode door motor on heater unit and connect it to main
harness.
2. Set up code No. in Self-diagnosis STEP 4. Refer to HA-45.
3. Move side link by hand and hold mode door in DEF mode.
4. Attach mode door motor rod to side link rod holder.
5. Make sure mode door operates properly when changing from
code No.
toby pushing DEF switch.
VENT B/L B/L FOOT D/F DEF
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TROUBLE DIAGNOSES
Mode Door Motor (Cont'd)
HA-81