SYSTEM DESCRIPTION
=NHHA0188
Component Parts
NHHA0188S01
Air mix door control system components are:
1) Auto amp.
2) Air mix door motor (LCU)
3) In-vehicle sensor
4) Ambient sensor
5) Sunload sensor
6) Intake sensor
System Operation
NHHA0188S02
The auto amplifier receives data from each of the sensors. The amplifier sends air mix door, mode door, intake
door opening angle data to the air mix door motor LCU, mode door motor LCU and intake door motor LCU.
The air mix door motor, mode door motor and intake 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 posi-
tion 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.
RHA424GB
Air Mix Door Control Specification
NHHA0188S03
RHA457H
GI
MA
EM
LC
EC
FE
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Air Mix Door Motor (Cont’d)
HA-61