Infiniti Q45 (FY33). Manual — part 484
Mode door control specification
RHA976FA
RHA164H
COMPONENT DESCRIPTION
The mode door motor is attached to the heater unit. It rotates so
that air is discharged from the outlet set by the auto amplifier. Motor
rotation is conveyed to a link which activates the mode door and
mode door position is fed back to the auto amplifier by the PBR
built-in mode door motor (LCU).
DIAGNOSTIC PROCEDURE
SYMPTOM: If PBR circuit is open or shorted.
Perform diagnostic procedure for LAN system circuit. Refer to
HA-106.
GI
MA
EM
LC
EC
FE
AT
PD
FA
RA
BR
ST
RS
BT
EL
IDX
TROUBLE DIAGNOSES
Mode Door Motor Circuit (LAN) (Cont’d)
HA-101
Air Mix Door Motor Circuit (LAN)
SYSTEM DESCRIPTION
Component parts
Air mix door control system components are:
1) Auto amp.
2) Air mix door motor (LCU: Local Control Unit)
3) In-vehicle sensor
4) Ambient sensor
5) Sunload sensor
6) Intake sensor
System operation
The auto amplifier receives data from each of the
sensors. The amplifier sends mode door, air mix
door, bi-level door motor LCU opening angle data to
the mode door motor LCU, air mix door motor LCU
and bi-level motor LCU.
The mode door motor, air mix door motor and bi-
level door motor read their respective signals
according to the address signal. Opening angle indi-
cation 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 or OPEN/CLOSE operation is
selected. The new selection data is returned to the
auto amplifier.
RHA424G
TROUBLE DIAGNOSES
HA-102
Air mix door control specification
RHA978F
RHA165H
COMPONENT DESCRIPTION
The air mix door motor is attached to the heater unit. It rotates so
that the air mix door is opened or closed to a position set by the
auto amplifier. Motor rotation is then conveyed through a shaft and
the air mix door position is then fed back to the auto amplifier by
PBR built-in air mix door motor (LCU).
DIAGNOSTIC PROCEDURE
SYMPTOM: If PBR circuit is open or shorted. (−
or
appears on the display as a result of conducting Self-diag-
nosis STEP 2.)
Perform diagnostic procedure for LAN system circuit. Refer to
HA-106.
GI
MA
EM
LC
EC
FE
AT
PD
FA
RA
BR
ST
RS
BT
EL
IDX
TROUBLE DIAGNOSES
Air Mix Door Motor Circuit (LAN) (Cont’d)
HA-103
Bi-level Door Motor Circuit (LAN)
SYSTEM DESCRIPTION
Component parts
Bi-level door control system components are:
1) Auto amplifier
2) Bi-level door motor (LCU: Local Control Unit)
3) In-vehicle sensor
4) Ambient sensor
5) Sunload sensor
6) Intake sensor
7) Control unit (PTC)
System operation
The auto amplifier receives data from each of the
sensors. The amplifier sends mode door, air mix
door, bi-level door motor LCU opening angle data to
the mode door motor LCU, air mix door motor LCU
and bi-level motor LCU.
The mode door motor, air mix door motor and bi-
level door motor read their respective signals
according to the address signal. Opening angle indi-
cation 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 or OPEN/CLOSE operation is
selected. The new selection data is returned to the
auto amplifier.
SHA985E
RHA512F
When the amount of sunload suddenly changes, the extra heat
caused by sunload is counteracted by adjusting the air outlet
temperature, but leaving the temperature around foot area as it is.
TROUBLE DIAGNOSES
HA-104
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