Infiniti QX4 (R50). Manual — part 468
RHA463GA
RHA334HA
8. Check AUTO Mode
NBHA0019S0208
1.
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)
NBHA0019S0209
1.
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 “Incident Simulation Tests” (GI section) and perform tests as
outlined to simulate driving conditions environment. If symptom
appears, refer to “Symptom Table” (HA-65) and perform applicable
trouble diagnosis procedures.
TROUBLE DIAGNOSES
Operational Check (Cont’d)
HA-70
A/C System
TROUBLE DIAGNOSIS PROCEDURE FOR A/C SYSTEM
=NBHA0089
SYMPTOM:
I
A/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
SC
EL
IDX
TROUBLE DIAGNOSES
A/C System
HA-71
RHA464GA
RHA858H
MAIN POWER SUPPLY AND GROUND CIRCUIT CHECK
NBHA0037
Component Description
NBHA0037S01
Automatic Amplifier (Auto Amp.)
NBHA0037S0101
The auto amplifier has a built-in microcomputer which processes
information sent from various sensors needed for air conditioner
operation. The air mix door motor, mode door motor, intake door
motor, blower motor and compressor are then controlled.
The auto amplifier is unitized with control mechanisms. Signals
from various switches and Potentio Temperature Control (PTC) are
directly entered into auto amplifier.
Self-diagnostic functions are also built into auto amplifier to provide
quick check of malfunctions in the auto air conditioner system.
RHA464GA
RHA867H
Potentio Temperature Control (PTC)
NBHA0037S0102
The PTC is built into the A/C auto amp. or Display & NAVI control
unit. It can be set at an interval of 0.5°C (1.0°F) in the 18°C (65°F)
to 32°C (85°F) temperature range by pushing the temperature but-
ton. The set temperature is digitally displayed.
TROUBLE DIAGNOSES
A/C System (Cont’d)
HA-72
RHA817H
DIAGNOSTIC PROCEDURE
NBHA0107
SYMPTOM:
I
A/C system does not come on.
RHA818H
Auto Amp. Check
NBHA0107S01
Check power supply circuit for auto amp. with ignition switch ON.
Measure voltage across terminal Nos. 26, 27, 33 (24, 25, 33) and
body ground.
Voltmeter terminal
Voltage
(+)
(−)
26 (24)
Body ground
Approx. 12V
27 (25)
33 (33)
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
A/C System (Cont’d)
HA-73
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