INFINITI QX4 2001 Factory Service Manual

14 CHECK MALFUNCTIONING DOOR MOTOR POSITION SWITCH
Mode or (and) intake door motor position switch(es) is (are) malfunctioning.
(If two or more mode or intake doors are out of order, corresponding code numbers blink respectively two times.)
MTBL0508
*1: If mode door motor harness connector is disconnected, the following display pattern will appear.
,,,,,Return to
*2: If intake door motor harness connector is disconnected, the following display pattern will appear.
,,,Return to
*3: HA-75
*4: HA-87
RHA168DA
RHA498A
©INSPECTION END
TROUBLE DIAGNOSES
Self-diagnosis (Cont'd)
HA-52

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).
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Self-diagnosis (Cont'd)
HA-53

INTRODUCTION AND GENERAL DESCRIPTIONNBHA0021S04The self-diagnostic system diagnoses sensors, door motors, blower motor, etc. by system line. Refer to appli-
cable sections (items) for details. Shifting from normal control to the self-diagnostic system is accomplished
by starting the engine (turning the ignition switch from ªOFFº to ªONº) and pressing ª
º switch for at least
5 seconds. The ª
º switch must be pressed within 10 seconds after starting the engine (ignition switch is
turned ªONº). This system will be canceled by either pressing
(AUTO) switch or turning the ignition switch
ªOFFº. Shifting from one step to another is accomplished by means of turning temperature dial, as required.
Additionally shifting from STEP 5 to AUXILIARY MECHANISM is accomplished by means of pushing
(fan)
UP switch.
With Navigation SystemNBHA0021S0401
RHA859H
TROUBLE DIAGNOSES
Self-diagnosis (Cont'd)
HA-54

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.
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Self-diagnosis (Cont'd)
HA-55

5 STEP 2 - SENSOR CIRCUITS ARE CHECKED FOR OPEN OR SHORT CIRCUIT
Turn temperature dial clockwise.
Does code No.
appear on the display?
RHA970DB
YesorNo
Ye s©GO TO 6.
No©GO TO 14.
6 STEP 3 - MODE DOOR AND INTAKE DOOR POSITIONS ARE CHECKED
Turn temperature dial clockwise.
Does code No.
appear on the display?
RHA869DD
YesorNo
Ye s©GO TO 7.
No©GO TO 15.
TROUBLE DIAGNOSES
Self-diagnosis (Cont'd)
HA-56

7 STEP 4 - OPERATION OF EACH ACTUATOR IS CHECKED
Turn temperature dial clockwise.
Engine running.
Press DEF switch, code No. of each actuator test is indicated on the display.
RHA495A
©GO TO 8.
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Self-diagnosis (Cont'd)
HA-57

8 CHECK ACTUATORS
Refer to the following chart and confirm discharge air flow, air temperature, blower motor voltage and compressor opera-
tion.
Checks must be made visually, by listening to any noise, or by touching air outlets with your hand, etc. for
improper operation.
MTBL0200
MTBL0044
OK or NG
OK©GO TO 9.
NG©IAir outlet does not change.
Go to ªMode Door Motorº (HA-75).
IIntake door does not change.
Go to ªIntake Door Motorº (HA-87).
IBlower motor operation is malfunctioning.
Go to ªBlower Motorº (HA-95).
IMagnet clutch does not engage.
Go to ªMagnet Clutchº (HA-104).
IDischarge air temperature does not change.
Go to ªAir Mix Door Motorº (HA-82).
TROUBLE DIAGNOSES
Self-diagnosis (Cont'd)
HA-58

9 STEP 5 - TEMPERATURE OF EACH SENSOR IS CHECKED
Turn temperature dial clcokwise.
Code No.
appears on the display.
RHA492A
©GO TO 10.
10 CHECK AMBIENT SENSOR
Press(DEF) switch one time, temperature detected by ambient sensor is indicated on the display.
ECON shown in display indicates negative temperature reading.
NOTE:
If temperature shown on display greatly differs from actual temperature, check sensor circuit first, then inspect sensor.
RHA861H
OK or NG
OK©GO TO 11.
NG©Go to Ambient Sensor Circuit (HA-129).
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Self-diagnosis (Cont'd)
HA-59

11 CHECK IN-VEHICLE SENSOR
Press(DEF) switch the second time, temperature detected by in-vehicle sensor is indicated on the display screen.
ECON shown in display indicates negative temperature reading.
NOTE:
If temperature shown on display greatly differs from actual temperature, check sensor circuit first, then inspect sensor.
RHA862H
OK or NG
OK©GO TO 12.
NG©Go to In-vehicle Sensor Circuit (HA-132).
12 CHECK INTAKE SENSOR
Press(DEF) switch the third time, temperature detected by intake sensor is indicated on the display.
NOTE:
If temperature shown on display greatly differs from actual temperature, check sensor circuit first, then inspect sensor.
RHA862HA
OK or NG
OK©GO TO 13.
NG©Go to Intake Sensor Circuit (HA-139).
TROUBLE DIAGNOSES
Self-diagnosis (Cont'd)
HA-60

13 DETECTS MULTIPLEX COMMUNICATION ERROR
Press REC switch.
Does code No.
appears on the display
MTBL0509
YesorNo
Ye s©INSPECTION END
No©1. Go to ªMultiplex Communication Circuitº, HA-142.
2. Go to ªOPERATIONAL CHECKº, HA-66.
Confirm that A/C system is in good order.
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Self-diagnosis (Cont'd)
HA-61