Lexus RX300 (MCU15). Manual — part 403
I18283
Hot
Cool
Hot
Cool
LHD model:
RHD model:
DI–842
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
1
Actuator check.
PREPARATION:
(a)
Warm up the engine.
(b)
Set to the actuator check mode (See page DI–805).
(c)
Press the A/C switch and change it to step operation.
CHECK:
Press the A/C switch and check the operation of the air mix
damper and the condition of the blower.
OK:
Display Code
Air Mix Damper
Condition
0 – 3
4 – 5
6 – 9
0% (Fully closed)
50%
100% (Fully opened)
Cool air comes out
Warm air comes out
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page DI–812).
NG
2
Check air mix damper control servomotor.
PREPARATION:
Remove air mix damper control servomotor
(See page AC–62).
CHECK:
Connect positive (+) lead to terminal 7 and negative (–) lead to
terminal 6.
OK:
The lever turns smoothly to Hot side.
CHECK:
Connect positive (+) lead to terminal 6 and negative (–) lead to
terminal 7.
OK:
The lever turns smoothly to Cool side.
NG
Replace air mix damper control servomotor as-
sembly.
OK
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
DI–843
LEXUS RX300 (RM785E)
3
Check harness and connector between A/C ECU (Combination meter ECU) and
air mix damper control servomotor assembly (See page IN–32).
NG
Repair or replace harness or connector.
OK
Check and replace A/C ECU (Combination
meter ECU).
I05277
A/C ECU (Combina-
tion meter ECU)
AIF
R
13
6
BR–Y
A24
Air Inlet Damper
Servomotor
7
12
AIR
C11
C11
DI–844
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
LEXUS RX300 (RM785E)
DTC
B1442/42 Air Inlet Damper Control Servomotor Circuit
CIRCUIT DESCRIPTION
The air inlet damper control servomotor is controlled by the A/C ECU (Combination meter ECU) and moves
the air inlet damper to the desired position.
DTC No.
Detection item
Trouble Area
Air inlet damper position sensor value does not change even if
S Air inlet damper position sensor.
B1442/42
Air inlet damper position sensor value does not change even if
A/C ECU (Combination meter ECU) operated air inlet damper
S Harness or connector between air inlet damper control servo-
motor assembly and A/C ECU (Combination meter ECU)
(
)
control servomotor.
motor assembly and A/C ECU (Combination meter ECU).
S A/C ECU (Combination meter ECU).
WIRING DIAGRAM
DI3G4–02
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
DI–845
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
1
Actuator check.
PREPARATION:
(a)
Remove glove box to see and check the air inlet damper
operation.
(b)
Set to the actuator check mode (See page DI–805).
(c)
Press the A/C switch and change it to step operation.
CHECK:
Press the A/C switch in order and check the operation of air inlet
damper.
OK:
Display Code
Air Inlet Damper
0 – 1
FRS
2
F/R
3 – 5
REC
6 – 9
FRS
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page DI–812).
NG
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