In FOOT mode, bi-level door is controlled according to blower operation. When blower is operating, auto
amplifier automatically computes target DEF vent air temperature in relation to set temperature, ambient
temperature, compartment temperature and sunload. It then determines whether relationship between inlet air
temperature, air-mix door position and current bi-level door position on one hand, and target DEF vent air
temperature on the other hand is adequate, thus opening, closing or stopping bi-level door as required. A
moderate level (not too warm) of air temperature will then be discharged to head level. Bi-level door is held
in fully closed position when air vents are set in F/D or DEF mode.
RHA200H
COMPONENT DESCRIPTION
The bi-level door motor is attached to the heater unit’s upper side.
It rotates so that the bi-level door motor is opened or closed to a
position set by the auto amplifier. Motor rotation is then fed back
to the auto amplifier by the PBR built-in bi-level 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
Bi-level Door Motor Circuit (LAN) (Cont’d)
HA-105