Lexus RX300 (MCU15). Service manual — part 404
I18284
LHD model:
RHD model:
REC
FRS
FRS
REC
DI–846
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
LEXUS RX300 (RM785E)
2
Check air inlet damper control servomotor.
PREPARATION:
(a)
Remove blower unit (See page AC–38).
(b)
Disconnect the air inlet damper control servomotor as-
sembly connector.
CHECK:
Connect positive (+) lead to terminal 6 and negative (–) lead to
terminal 7.
OK:
The lever moves smoothly to REC position.
CHECK:
Connect positive (+) lead to terminal 7 and negative (–) lead to
terminal 6.
OK:
The lever moves smoothly to FRS position.
NG
Replace air inlet damper control servomotor as-
sembly.
OK
3
Check harness and connector between A/C ECU (Combination meter ECU) and
air inlet damper control servomotor (See page IN–32).
NG
Repair or replace harness or connector.
OK
Check and replace A/C ECU (Combination
meter ECU).
I05279
A/C ECU (Combina-
tion meter ECU)
6
LG–B
7
10
A26
Air Outlet Damper
Control Servomotor
W
IF1
C10
1
R–W
6
5
AOF
AOD
IF1
LG–B
C10
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
DI–847
LEXUS RX300 (RM785E)
DTC
B1443/43 Air Outlet Damper Control Servomotor Cir-
cuit
CIRCUIT DESCRIPTION
This circuit turns the servomotor and changes each mode damper position by the signals from the A/C ECU
(Combination meter ECU). When the AUTO switch is on, the A/C ECU (Combination meter ECU) changes
the mode automatically between (FACE), (BI–LEVEL) and (FOOT) according to the temperature setting.
DTC No.
Detection Item
Trouble Area
S Air outlet damper control servomotor.
S Air outlet damper position sensor
B1443/43
Air outlet damper position sensor value does not change even
if A/C ECU (C
bi
ti
t
ECU)
t d i
tl t
S Air outlet damper position sensor.
S Harness or connector between air outlet damper control ser-
t
d A/C ECU (C
bi
ti
t
ECU)
B1443/43
if A/C ECU (Combination meter ECU) operated air outlet
damper control servomotor.
vomotor and A/C ECU (Combination meter ECU)
S Harness or connector between air outlet damper position
sensor and A/C ECU (Combination meter ECU)
S A/C ECU (Combination meter ECU).
WIRING DIAGRAM
DI3G5–02
Display Code
Air Flow
0 ∼ 4
5
6, 7
8
9
FACE
BI–LEVEL
FOOT
FOOT DEF
DEF
I18285
LHD model:
RHD model:
FACE
DEF
FACE
DEF
DI–848
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
1
Actuator check.
PREPARATION:
(a)
Set to the actuator check mode (See page DI–805).
(b)
Press the A/C switch and change to step operation.
CHECK:
Press the A/C switch and check the condition of air flow.
OK:
The mode changes with the change in the tempera-
ture display as shown in the table.
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page DI–812).
NG
2
Check air outlet damper control servomotor.
PREPARATION:
(a)
Remove A/C unit. (See page AC–63).
(b)
Disconnect the air outlet damper control servomotor as-
sembly connector.
CHECK:
Connect positive (+) lead to terminal 7 and negative (–) lead to
terminal 6.
OK:
The lever moves smoothly to FACE position.
CHECK:
Connect positive (+) lead to terminal 6 and negative (–) lead to
terminal 7.
OK:
The lever moves smoothly to DEF position.
NG
Replace air outlet servomotor.
OK
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
DI–849
LEXUS RX300 (RM785E)
3
Check for open and short in harness and connector between A/C ECU (Combina-
tion meter ECU) and outlet servomotor, outlet damper control servomotor and
battery, outlet damper control servomotor and body ground (See page IN–32).
NG
Repair or replace harness or connector.
OK
Check and replace A/C ECU (Combination
meter ECU).
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