Max cool damper sensor LEXUS LS430 2003 Factory Repair Manual

ROOM TEMP
Room temperature sensor / min.: -
6.5°C (20.3°F) max.: 57.25°C
(126.95°F)
Actual room temperature is displayed-
AMBI TEMP
SENSAmbient temperature sensor /
min.: -23.3°C (-9.94°F) max.:
65.95°C (150.71°F)Actual ambient temperature is
displayed-
EVAP TEMP
Evaporator temperature sensor /
min.: -29.7°C (-21.46°F) max.:
59.55°C (139.19°F)Actual evaporator temperature is
displayed-
SOLAR SENS-DSolar sensor (Driver side) / min.:
0 max.: 255Increases as brightness increases-
SOLAR SENS-PSolar sensor (Passenger side) /
min.: 0 max.: 255decreases as brightness increases-
COOLANT
TEMPEngine coolant temperature /
min.: 1.3°C (34.34°F) max.:
90.55°C (194.99°F)Actual engine coolant temperature is
displayed while the engine is warmed
up
-
DUCT TEMP-D
Duct sensor (Driver side) / min.: -
12.7°C (9.14°F) max.: 76.55°C
(169.79°F)Actual duct temperature is displayed
(Driver side)-
DUST TEMP-P
Duct sensor (Passenger side) /
min.: -12.7°C (9.14°F) max.:
76.55°C (169.79°F)Actual duct temperature is displayed
(Passenger side)-
SET TEMP-DSet temperature (Driver side) /
min.: 0 max.: 255Actual set temperature is displayed
(Driver side)-
SET TEMP-PSet temperature (Passenger
side) /min.: 0 max.: 255Actual set temperature is displayed
(Passenger side)-
ESTIMATE
TEMP-DEstimated temperature (Driver
side) / min.: -358.4°C (-613.12°F)
max.: 358.4°C (677.12°F)Actual estimated temperature is
displayed (Driver side)-
ESTIMATE
TEMP-PEstimated temperature (Passenger
side) / min.: -358.4°C (-613.12°F)
max.: 358.4°C (677.12°F)Actual estimated temperature is
displayed (Passenger side)-
A/I DAMP POSAir inlet damper position / min.: -
14% max.: 113.5%RECIRCULATION: Approx. 0%
FRESH: Approx. 100%-
A/B DAMP POS-
DCool air bypass damper position
(Driver side) / min.: -14% max.:
113.5%OPEN: Approx. 0 % SHUT: Approx.
100%-
A/B DAMP POS-
PCool air bypass damper position
(Passenger side) / min.: -14%
max.: 113.5%OPEN: Approx. 0 % SHUT: Approx.
100%-
ItemMeasurement Item / Display
(Range)Normal ConditionDiagnostic
Note
A/I DAMP
TARGAir inlet damper target / min.: -
14% max.: 113.5%RECIRCULATION: Approx. 0%
FRESH: Approx. 100% HALF-
RECIRCULATION: 43 to 99.5 %
-

Fig. 31: Rear A/C Problem Symptoms Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Air Purifier
Fig. 32: Air Purifier Problem Symptoms Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Intelligent Swing Register
Fig. 33: Intelligent Swing Register Problem Symptoms Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
If a malfunction code is displayed during the DTC check (sensor check), check the circuit listed for that code in
the table below.
DIAGNOSTIC TROUBLE CODE CHART
DTCDescription
DTC B1411ROOM TEMPERATURE SENSOR CIRCUIT
DTC B1412AMBIENT TEMPERATURE SENSOR CIRCUIT
DTC B1413EVAPORATOR TEMPERATURE SENSOR CIRCUIT
DTC B1415AIR DUCT SENSOR CIRCUIT (DRIVER SIDE)
DTC B1416AIR DUCT SENSOR CIRCUIT (PASSENGER SIDE)
DTC B1418EMISSION GAS SENSOR CIRCUIT
DTC B1421SOLAR SENSOR CIRCUIT (PASSENGER SIDE)
DTC B1423PRESSURE SWITCH CIRCUIT
DTC B1424SOLAR SENSOR CIRCUIT (DRIVER SIDE)
DTC B1428REAR SOLAR SENSOR CIRCUIT
DTC B1432AIR INLET DAMPER POSITION SENSOR CIRCUIT
DTC B1434MAX COOL DAMPER POSITION SENSOR CIRCUIT (DRIVER SIDE)
DTC B1435MAX COOL DAMPER POSITION SENSOR CIRCUIT (PASSENGER SIDE)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT
)
CIRCUIT DESCRIPTION
This sensor detects the position of the cool air bypass servomotor (Max cool damper servomotor) and sends the
appropriate signals to the A/C amplifier. The position sensor is built in the cool air bypass servomotor.

Fig. 99: TPBDR Terminal Voltage/Damper Opening Angle Graph
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Fig. 100: DTC Detection Item Trouble Area Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
WIRING DIAGRAM
Fig. 101: Max Cool Damper Position Sensor Circuit (Driver Side)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 104: Checking Harness And Connector (Cool Air Bypass Servomotor - Air Conditioning
Amplifier)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT
)
CIRCUIT DESCRIPTION
This sensor detects the position of the cool air bypass servomotor (Max cool damper servomotor) and sends the
appropriate si
gnals to the A/C amplifier. The position sensor is built in the cool air bypass servomotor.

Fig. 107: Max Cool Damper Position Sensor Circuit (Passenger Side)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.READ VALUE ON HAND-HELD TESTER
a. Connect the hand-held tester to the DLC3.
b. Turn the ignition switch to the ON position and push the hand-held tester main switch on.
c. Select the item below in the DATA LIST, and read the display on the hand-held tester.
DATA LIST / AIR CONDITIONER:
DATA LIST / AIR CONDITIONER
ItemMeasure Item/Display (Range)Normal ConditionDiagnostic
Note
A/B DAMP
POS-PCool air bypass damper position (Passenger
side) / min.: -14% max.: 113.5%OPEN: Approx. 0 %
SHUT: Approx. 100%-

HVAC DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
LIGHTING SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
SENSOR/SWITCH "D"/"E" VOLTAGE
CORRELATION
DTC P2121 THROTTLE/PEDAL POSITION
SENSOR/SWITCH "D" CIRCUIT
RANGE/PERFORMANCE
DTC U0001 HIGH SPEED CAN COMMUNICATION
CIRCUIT
DTCDescription
DTC B1411 ROOM TEMPERATURE SENSOR CIRCUIT
DTC B1412 AMBIENT TEMPERATURE SENSOR CIRCUIT
DTC B1413 EVAPORATOR TEMPERATURE SENSOR CIRCUIT
DTC B1415 AIR DUCT SENSOR CIRCUIT (DRIVER SIDE)
DTC B1416 AIR DUCT SENSOR CIRCUIT (PASSENGER SIDE)
DTC B1418 EMISSION GAS SENSOR CIRCUIT
DTC B1421 SOLAR SENSOR CIRCUIT (PASSENGER SIDE)
DTC B1423 PRESSURE SWITCH CIRCUIT
DTC B1424 SOLAR SENSOR CIRCUIT (DRIVER SIDE)
DTC B1428 REAR SOLAR SENSOR CIRCUIT
DTC B1432 AIR INLET DAMPER POSITION SENSOR CIRCUIT
DTC B1434 MAX COOL DAMPER POSITION SENSOR CIRCUIT (DRIVER SIDE)
DTC B1435 MAX COOL DAMPER POSITION SENSOR CIRCUIT (PASSENGER SIDE)
DTC B1442 AIR INLET DAMPER CONTROL SERVOMOTOR CIRCUIT
DTC B1451 COMPRESSOR SOLENOID CIRCUIT
DTC B1461 EMISSION GAS NOX SENSOR CIRCUIT
DTCDescription
DTC B1244 LIGHT SENSOR CIRCUIT MALFUNCTION
DTC B1268 BACK-UP COMMUNICATION BUS MALFUNCTION
DTC B2402, B2403 TRANSISTOR RELAY OVERLOAD/OVERHEAT MALFUNCTION
DTC B2412, B2413 HEADLIGHT SWIVEL MOTOR LH/RH MALFUNCTION
DTC B2414 STEERING POSITION SENSOR MALFUNCTION
DTC B2415 VEHICLE SPEED SENSOR MALFUNCTION
DTC B2416 HEIGHT CONTROL SENSOR MALFUNCTION
DTC B2417, B2418 HEADLIGHT BEAM LEVEL CONTROL MOTOR LH/RH
MALFUNCTION

INSPECTION
1.CHECK EVAPORATOR AND HEATER RADIATOR FINS FOR FOREIGN MATTER
If foreign matter is attached to the fin, blow it off with compressed air.
2.CHECK FITTINGS FOR CRACKS OR SCRATCHES
a. Repair as necessary.
3.INSPECT EVAPORATOR TEMPERATURE SENSOR CIRCUIT (See DTC B1413:
EVAPORATOR TEMPERATURE SENSOR CIRCUIT )
4.INSPECT COOL AIR BYPASS DAMPER POSITION SENSOR CIRCUIT (DRIVER SIDE) (See
DTC B1434: MAX COOL DAMPER POSITION SENSOR CIRCUIT (DRIVER SIDE)
)
5.INSPECT COOL AIR BYPASS DAMPER CONTROL SERVOMOTOR CIRCUIT (DRIVER
SIDE) (See COOL AIR BYPASS DAMPER CONTROL SERVOMOTOR CIRCUIT (DRIVER
SIDE) )
6.INSPECT COOL AIR BYPASS DAMPER POSITION SENSOR CIRCUIT (PASSENGER SIDE)
(See COOL AIR BYPASS DAMPER CONTROL SERVOMOTOR CIRCUIT (PASSENGER
SIDE) )
7.INSPECT COOL AIR BYPASS DAMPER CONTROL SERVOMOTOR CIRCUIT (PASSENGER
SIDE) (SEE COOL AIR BYPASS DAMPER CONTROL SERVOMOTOR CIRCUIT
(PASSENGER SIDE) )
8.INSPECT WATER VALVE CONTROL SERVOMOTOR CIRCUIT (See WATER VALVE
CONTROL SERVOMOTOR CIRCUIT )
9.INSPECT AIR VENT MODE DAMPER CONTROL SERVOMOTOR CIRCUIT (See AIR VENT
MODE DAMPER CONTROL SERVOMOTOR CIRCUIT )
10.INSPECT AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT (See AIR MIX DAMPER
CONTROL SERVOMOTOR CIRCUIT )
OVERHAUL
HINT:
Installation is in the reverse order of removal.
See COMPONENTS .
1.DISCONNECT NEGATIVE TERMINAL CABLE FROM BATTERY
2.EVACUATE REFRIGERANT HFC-134A (R134A) (See REPLACEMENT
)
3.DRAIN ENGINE COOLANT FROM RADIATOR
HINT:
It is not necessar
y to drain out all coolant.