Lexus RX300 (MCU15). Manual — part 402
TPM
terminal
voltage
(V)
4
1
0
100 %
Damper opening angle
I08342
S5–1
TPO
SG–1
C10
3
4
10
G–R
LG–R
B–R
IF1
3
2
6
3
5
1
A26
Air Outlet Damper Position Sensor
(Air Outlet Control Servomotor)
A/C ECU (Combina-
tion Meter ECU)
G–B
LG–R
B–Y
IF1
IF1
C10
C10
DI–838
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
LEXUS RX300 (RM785E)
DTC
B1433/33 Air Outlet Damper Position Sensor Circuit
CIRCUIT DESCRIPTION
This sensor detects the position of the air mix damper and
sends the appropriate signals to the A/C ECU (Combination
meter ECU).
The position sensor is built into the air outlet damper control ser-
vomotor assembly.
DTC No.
Detection Item
Trouble Area
B1433/33
Short to ground or power source circuit in air outlet damper
S Air outlet damper position sensor.
S Harness or connector between air outlet damper control ser-
B1433/33
Short to ground or ower source circuit in air outlet dam er
position sensor circuit.
Harness or connector between air outlet dam er control ser
vomotor assembly and A/C ECU (Combination meter ECU).
S A/C ECU (Combination meter ECU).
WIRING DIAGRAM
DI3G2–02
I08356
TPO
SG–1
(–)
(+)
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
DI–839
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 outlet damper position using hand–held tester.
PREPARATION:
Connect the hand–held tester to the DLC3.
CHECK:
Check the current position of air outlet damper and the target position of air outlet 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 TPO and SG–1 of A/C ECU (Combination meter
ECU) connector.
PREPARATION:
(a)
Remove A/C ECU with connectors still connected.
(b)
Turn ignition switch ON.
CHECK:
Measure the voltage between terminals TPO and SG–1 of A/C
ECU.
OK:
Air outlet position
Voltage
FACE
3.5 – 4.5 V
DEF
0.5 – 1.5 V
HINT:
As the air outlet damper control servomotor is moved from
VENT side to DEF side, the voltage decreases gradually with-
out interruption.
NG
Go to step 3.
OK
Proceed to next circuit inspection shown on problem symptoms table (See page DI–812). Howev-
er, if DTC B1433/33 is displayed, check and replace A/C ECU (Combination meter ECU).
I18282
1
5
3
FACE
DEF
LHD model:
RHD model:
FACE
DEF
DI–840
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
LEXUS RX300 (RM785E)
3
Check air outlet damper position sensor.
PREPARATION:
(a)
Remove A/C unit (See page AC–63).
(b)
Disconnect air outlet damper control servomotor assem-
bly connector.
CHECK:
Measure resistance between terminals 1 and 3 of air outlet ser-
vomotor assembly connector.
OK:
Resistance : 4.2 – 7.8 kΩ
CHECK:
While operating air outlet damper control servomotor as in the
procedure on page DI–847, measure resistance between ter-
minals 1 and 3 of air outlet damper control servomotor.
OK:
Resistance:
Damper Position
Resistance
DEF
0.5 – 1.1 kΩ
FACE
3.6 – 6.8 kΩ
HINT:
As the air outlet servomotor moves from DEF side to FACE side,
the resistance decreases gradually without interruption.
NG
Replace air outlet damper control servomotor.
OK
4
Check harness and connector between A/C ECU (Combination meter ECU) and
air outlet 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).
I08346
A/C ECU (Combina-
tion meter ECU)
A25
Air Mix Damper
Servomotor
7
7
6
C10
IF1
8
Y
Y–R
8
9
AMH
AMC
C10
IF1
Y–G
Y–B
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
DI–841
LEXUS RX300 (RM785E)
DTC
B1441/41 Air Mix Damper Control Servomotor Circuit
CIRCUIT DESCRIPTION
The air mix damper control servomotor is controlled by the A/C ECU (Combination meter ECU) and moves
the air mix damper to the desired position.
DTC No.
Detection Item
Trouble Area
B1441/41
Air mix damper position sensor value does not change even if
A/C ECU (Combination meter ECU) operates air mix damper
control servomotor.
S Air mix damper control servomotor.
S Air mix damper position sensor.
S Harness or connector between A/M damper control servomo-
tor and A/C ECU (Combination meter ECU)
S Harness or connector between A/M damper position sensor
and A/C ECU (Combination meter ECU)
S A/C ECU (Combination meter ECU).
WIRING DIAGRAM
DI3G3–03
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