INFINITI QX4 2001 Factory Service Manual

MHA975A
TROUBLE DIAGNOSES
Wiring Diagram Ð A/C, A Ð (Without Navigation System) (Cont'd)
HA-32

MHA976A
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Wiring Diagram Ð A/C, A Ð (Without Navigation System) (Cont'd)
HA-33

MHA977A
TROUBLE DIAGNOSES
Wiring Diagram Ð A/C, A Ð (Without Navigation System) (Cont'd)
HA-34

Circuit Diagram (With Navigation System)NBHA0113
MHA978A
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Circuit Diagram (With Navigation System)
HA-35

Wiring Diagram Ð A/C, A Ð (With Navigation
System)
NBHA0114
MHA979A
TROUBLE DIAGNOSES
Wiring Diagram Ð A/C, A Ð (With Navigation System)
HA-36

MHA980A
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Wiring Diagram Ð A/C, A Ð (With Navigation System) (Cont'd)
HA-37

MHA981A
TROUBLE DIAGNOSES
Wiring Diagram Ð A/C, A Ð (With Navigation System) (Cont'd)
HA-38

MHA982A
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Wiring Diagram Ð A/C, A Ð (With Navigation System) (Cont'd)
HA-39

RHA464GA
RHA858H
Auto Amp. Terminals and Reference ValueNBHA0036INSPECTION OF AUTO AMP.NBHA0036S01IMeasure voltage between each terminal and body ground by
following ªAUTO AMP. INSPECTION TABLEº.
IPin connector terminal layout
RHA839H
AUTO AMP. INSPECTION TABLENBHA0036S02Without Navigation SystemNBHA0036S0201
TERMINAL
NO.ITEM CONDITIONVoltage
V
1 Intake sensor Ð Ð
2 Ambient sensor Ð Ð
3 In-vehicle sensor Ð Ð
6 ECM signal
Compressor: ON Approximately 0
Ccompressor: OFF Approximately 4.6
8 Intake door position switch Intake door positionFRESH Approximately 0
RECIRCULATION or 20%
FRESHApproximately 4.6
11 Sensor ground Ð Approximately 0
12 Sunload sensor Ð Ð
TROUBLE DIAGNOSES
Auto Amp. Terminals and Reference Value
HA-40

TERMINAL
NO.ITEM CONDITIONVoltage
V
13 Thermal transmitter
Engine coolant
temperatureApproximately 30ÉC (86ÉF) Approximately 9.4
Approximately 55ÉC (131ÉF) Approximately 6.5
Approximately 100ÉC
(212ÉF)Approximately 2.4
14 Ground (for Canada) Ð Approximately 0
16 A/C LAN signal Ð Approximately 5.5
18 Intake door position switch Intake door position20% FRE or RECIRCULA-
TIONApproximately 0
FRESH Approximately 4.6
19 Intake door position switch Intake door positionRECIRCULATION or
FRESHApproximately 0
20% FRE Approximately 4.6
21Power supply for mode door
motor and air mix door motorÐ Approximately 12
22 Compressor ON signal
CompressorON Approximately 0
OFF Approximately 4.6
24 Power supply for illumination
Lighting switchOFF Approximately 0
1st Approximately 12
25 Illumination ground Ð Approximately 0
26 Power supply for BAT
Ð BATTERY VOLTAGE
27 Power supply for IGN
Ð Approximately 12
28Power supply for intake door
motorIntake door positionFRESH Approximately 12
RECIRC Approximately 0
32 Ground Ð Approximately 0
33 Power source for A/C Ignition voltage feed back Approximately 12
34 Blower motor feed back Fan speed: Low Approximately7-10
35Fan control AMP. control sig-
nalFan speedLow, Middle low or Middle
highApproximately 2.5 -
3.0
High Approximately9-10
36Power supply for intake door
motorIntake door positionFRESH Approximately 0
RECIRC Approximately 12
With Navigation SystemNBHA0036S0202
TERMINAL
NO.ITEM CONDITIONVoltage
V
1 Intake sensor Ð Ð
2 Ambient sensor Ð Ð
3 In-vehicle sensor Ð Ð
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Auto Amp. Terminals and Reference Value (Cont'd)
HA-41