diagram INFINITI QX4 2001 Factory Service Manual

Wiring Diagrams and Trouble DiagnosesNBHA0007When you read wiring diagrams, refer to the following:
IGI-11, ªHOW TO READ WIRING DIAGRAMSº
IEL-10, ªWiring Diagram Ð POWER к for power distribution
circuit
When you perform trouble diagnoses, refer to the following:
IGI-34, ªHOW TO FOLLOW TROUBLE DIAGNOSESº
IGI-24, ªHOW TO PERFORM EFFICIENT DIAGNOSIS FOR
AN ELECTRICAL INCIDENTºGI
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PRECAUTIONS
Wiring Diagrams and Trouble Diagnoses
HA-9

IntroductionNBHA0013AIR CONDITIONER LAN SYSTEM OVERVIEW CONTROL SYSTEMNBHA0013S01The LAN system consists of auto amp., air mix door motor and mode door motor.
A configuration of these components is shown in the diagram below.
RHA439G
FeaturesNBHA0014SYSTEM CONSTRUCTION (LAN)NBHA0014S08A small network is constructed between the auto amplifier, air mix door motor and mode door motor. The auto
amplifier and motors are connected by data transmission lines and motor power supply lines. The LAN net-
work is built through the ground circuits of the two motors.
Addresses, motor opening angle signals, motor stop signals and error checking messages are all transmitted
through the data transmission lines connecting the auto amplifier and two motors.
The following functions are contained in LCUs built into the air mix door motor and the mode door motor.
IAddress
IMotor opening angle signals
IData transmission
IMotor stop and drive decision
IOpening angle sensor (PBR function)
IComparison
IDecision (Auto amplifier indicated value and motor opening angle comparison)
RHA440GA
OperationNBHA0014S0801The auto amplifier receives data from each of the sensors. The amplifier sends air mix door and mode door
opening angle data to the air mix door motor LCU and mode door motor LCU.
The air mix door motor and mode door motor read their respective signals according to the address signal.
Opening angle indication signals received from the auto amplifier and each of the motor position sensors are
compared by the LCUs in each motor with the existing decision and opening angles. Subsequently, HOT/
COLD or DEFROST/VENT operation is selected. The new selection data is returned to the auto amplifier.
DESCRIPTION
Introduction
HA-20

Overview of Control System=NBHA0015The control system consists of input sensors, switches, the automatic amplifier (microcomputer) and outputs.
The relationship of these components is shown in the diagram below:
RHA856H
Control OperationNBHA0016
RHA452GA
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DESCRIPTION
Overview of Control System
HA-23

Circuit Diagram (Without Navigation System)NBHA0034
MHA973A
TROUBLE DIAGNOSES
Circuit Diagram (Without Navigation System)
HA-30

Wiring Diagram Ð A/C, A Ð (Without
Navigation System)
NBHA0035
MHA974A
GI
MA
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EC
FE
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TF
PD
AX
SU
BR
ST
RS
BT
SC
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IDX
TROUBLE DIAGNOSES
Wiring Diagram Ð A/C, A Ð (Without Navigation System)
HA-31

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

MHA976A
GI
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LC
EC
FE
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PD
AX
SU
BR
ST
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BT
SC
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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
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PD
AX
SU
BR
ST
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BT
SC
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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