Lexus RX300 (MCU15). Manual — part 401
I18280
1
Hot
Cool
3
5
LHD model:
RHD model:
Cool
Hot
Hot
DI–834
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
LEXUS RX300 (RM785E)
3
Check air mix damper position sensor.
PREPARATION:
(a)
Remove heater unit (See page AC–27).
(b)
Disconnect air mix damper control servomotor assembly
connector.
CHECK:
Measure resistance between terminals 1 and 3 of air mix damp-
er control servomotor assembly connector.
OK:
Resistance : 4.2 – 7.8 kΩ
CHECK:
While operating air mix damper control servomotor, following
the procedure on page DI–841, measure resistance between
terminals 1 and 5 of air mix damper control servomotor assem-
bly connector.
OK:
Position
Resistance
Max. cool
3.6 – 6.8 kΩ
Max. hot
0.5 – 1.1 kΩ
HINT:
As the air mix damper control servomotor moves from cool side
to hot side, the resistance decreases.
NG
Replace air mix damper control servomotor as-
sembly.
OK
4
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).
(V)
4
1
0
100 %
TPI
terminal voltage
Damper opening angle
I08370
A24 Air Inlet Damper Position Sensor
(Air Inlet Control Servomotor)
1
5
3
V–W
GR
B–W
8
11
S5–2
TPI
SG–2
A/C ECU
(Combination meter ECU)
C11
1
C11
C11
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
DI–835
LEXUS RX300 (RM785E)
DTC
B1432/32 Air Inlet Damper Position Sensor Circuit
CIRCUIT DESCRIPTION
This sensor detects the position of the air inlet damper and
sends the appropriate signals to the A/C ECU (Combination
meter ECU).
The position sensor is built into the air inlet damper control ser-
vomotor assembly.
DTC No.
Detection Item
Trouble Area
B1432/32
Short to ground or power source circuit in air inlet damper posi-
S Air inlet damper position sensor.
S Harness or connector between air inlet damper control servo-
B1432/32
Short to ground or ower source circuit in air inlet dam er osi
tion sensor circuit.
Harness or connector between air inlet dam er control servo
motor assembly and A/C ECU (Combination meter ECU).
S A/C ECU (Combination meter ECU).
WIRING DIAGRAM
DI3G1–02
I08354
SG–2
(+)
(–)
TPI
DI–836
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
HINT:
In case of using the hand–held tester, start the inspection from step1 and in case of not using the hand–held
tester, start from step2.
1
Check air inlet damper position using hand–held tester.
PREPARATION:
Connect the hand–held tester to the DLC3.
CHECK:
Check the current position of air inlet damper and the target position of air inlet damper.
OK:
The current position and target position are almost similar.
OK
Check and replace A/C ECU (Combination me-
ter ECU).
NG
2
Check voltage between terminals TPI and SG–2 of A/C ECU (Combination meter
ECU) connector.
PREPARATION:
Remove A/C ECU with connectors still connected.
CHECK:
(a)
Turn ignition switch ON.
(b)
Press REC/FRS switch to change air inlet between fresh
and recirculation air, and measure voltage between termi-
nals TPI and SG–2 of A/C ECU when the air inlet damper
control servomotor operates.
OK:
FRS–REC Switch
Voltage
REC
3.5 – 4.5 V
FRS
0.5 – 1.5 V
HINT:
As the air inlet damper control servomotor is moved form REC
side to FRS side, the voltage decreases.
NG
Go to step 3.
OK
Proceed to next circuit inspection shown on problem symptoms table (See page DI–812). Howev-
er, if DTC B1432/32 is displayed, check and replace A/C ECU (Combination meter ECU).
I18281
1
3
5
LHD model:
RHD model:
FRS
REC
FRS
REC
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
DI–837
LEXUS RX300 (RM785E)
3
Check air inlet damper position sensor.
PREPARATION:
(a)
Remove blower unit unit (See page AC–36).
(b)
Disconnect air inlet damper control servomotor assembly
connector.
CHECK:
Measure resistance between terminals 1 and 3 of air inlet
damper control servomotor assembly connector.
OK:
Resistance : 4.2 – 7.8 kΩ
CHECK:
While operating air inlet damper control servomotor, following
the procedure on page DI–844, measure resistance between
terminals 1 and 5 of air inlet damper control servomotor assem-
bly connector.
OK:
Resistance
Damper Position
Resistance
REC side
3.1 – 5.8 kΩ
FRS side
0.8 – 1.6 kΩ
HINT:
As the air inlet damper control servomotor moves from REC
side to FRS side, the resistance decreases.
NG
Replace air inlet damper control servomotor as-
sembly.
OK
4
Check harness and connectors between A/C ECU (Combination meter ECU) and
air inlet 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).
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