2001 INFINITI QX4 IDX

RHA441GA
Transmission Data and Transmission OrderNBHA0014S0802Amplifier data is transmitted consecutively to each of the door motors following the form shown in figure below.
Start: Initial compulsory signal sent to each of the door motors.
Address: Data sent from the auto amplifier is selected according to data-based decisions made by the air mix
door motor and mode door motor.
If the addresses are identical, the opening angle data and error check signals are received by the door motor
LCUs. The LCUs then make the appropriate error decision. If the opening angle data is normal, door control
begins.
If an error exists, the received data is rejected and corrected data received. Finally, door control is based upon
the corrected opening angle data.
Opening angle: Data that shows the indicated door opening angle of each door motor.
Error check: Procedure by which sent and received data is checked for errors. Error data is then compiled.
The error check prevents corrupted data from being used by the air mix door motor and mode door motor.
Error data can be related to the following problems.
IAbnormal electrical frequency
IPoor electrical connections
ISignal leakage from transmission lines
ISignal level fluctuation
Stop signal: At the end of each transmission, a stop operation, in-operation, or internal problem message is
delivered to the auto amplifier. This completes one data transmission and control cycle.
RHA442G
Air Mix Door Control (Automatic Temperature Control)NBHA0014S0803The air mix door is automatically controlled so that in-vehicle temperature is maintained at a predetermined
value by: The temperature setting, ambient temperature, in-vehicle temperature and amount of sunload.
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DESCRIPTION
Features (Cont'd)
HA-21

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

Discharge Air FlowNBHA0017
RHA043G
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DESCRIPTION
Discharge Air Flow
HA-25

Component LocationNBHA0033ENGINE COMPARTMENTNBHA0033S01
SHA281FA
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TROUBLE DIAGNOSES
Component Location
HA-27

With Navigation SystemNBHA0033S0202
RHA857H
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TROUBLE DIAGNOSES
Component Location (Cont'd)
HA-29

Wiring Diagram Ð A/C, A Ð (Without
Navigation System)
NBHA0035
MHA974A
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TROUBLE DIAGNOSES
Wiring Diagram Ð A/C, A Ð (Without Navigation System)
HA-31

MHA976A
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Wiring Diagram Ð A/C, A Ð (Without Navigation System) (Cont'd)
HA-33

Circuit Diagram (With Navigation System)NBHA0113
MHA978A
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TROUBLE DIAGNOSES
Circuit Diagram (With Navigation System)
HA-35