2001 INFINITI QX4 Factory Service Manual

Page 1865 of 2395

INFINITI QX4 2001  Factory Service Manual Operational CheckNBHA0019The purpose of the operational check is to confirm that the system
operates properly.
CONDITIONS:NBHA0019S01IEngine running and at normal operating temperature.
RHA864H
RHA335

Page 1866 of 2395

INFINITI QX4 2001  Factory Service Manual RHA865H
RHA330HA
3. Check Discharge AirNBHA0019S02031. Press MODE switch four times and D/F button.
2. Each position indicator should change shape.
RHA654F
3. Confirm that discharge air comes out acco

Page 1867 of 2395

INFINITI QX4 2001  Factory Service Manual RHA459GA
RHA331HA
4. Check RecirculationNBHA0019S02041. Press RECswitch.
Recirculation indicator should illuminate.
2. Listen for intake door position change (you should hear blower
sound change sligh

Page 1868 of 2395

INFINITI QX4 2001  Factory Service Manual 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 outle

Page 1869 of 2395

INFINITI QX4 2001  Factory Service Manual 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 ai

Page 1870 of 2395

INFINITI QX4 2001  Factory Service Manual A/C System
TROUBLE DIAGNOSIS PROCEDURE FOR A/C SYSTEM=NBHA0089SYMPTOM:
IA/C system does not come on.
INSPECTION FLOW
RHA866H
*1: HA-72 *2: HA-66 *3: HA-142
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT

Page 1871 of 2395

INFINITI QX4 2001  Factory Service Manual RHA464GA
RHA858H
MAIN POWER SUPPLY AND GROUND CIRCUIT CHECKNBHA0037Component DescriptionNBHA0037S01Automatic Amplifier (Auto Amp.)NBHA0037S0101The auto amplifier has a built-in microcomputer which pro

Page 1872 of 2395

INFINITI QX4 2001  Factory Service Manual RHA817H
DIAGNOSTIC PROCEDURENBHA0107SYMPTOM:
IA/C system does not come on.
RHA818H
Auto Amp. CheckNBHA0107S01Check power supply circuit for auto amp. with ignition switch ON.
Measure voltage across te