2003 LEXUS LS430 damper

HINT:
The followings are the possible items to be customized.
AIR CONDITIONER
AIR CONDITIONER CUSTOMIZE PARAMETERS
SMOK - Body
ground (L14-16
- Body ground)L - Body
groundSmoke sensor
operation signal
Ignition switch ON. Rear A/C switch to
AUTO. By using cigarette smoke. Ignition
switch ON. Rear A/C switch to AUTO. By
not using cigarette smoke.
Above 4.0 V
Below 1.0 V
AUTO - Body
ground (L14-17
- Body ground)W -
Body
groundAuto switch
signal
Ignition switch ON. Rear A/C rear seat
AUTO indicator lights up. Ignition switch
ON. Rear A/C rear seat AUTO indicator
does not light up.
Below 1.0 V 10 to
14 V
RHR - Body
ground (L14-18
- Body ground)V -
Body
groundRear blower
motor operation
signal
Ignition switch ON. Rear A/C manual
mode. Rear A/C blower motor does not
operate. Ignition switch ON. Rear A/C
manual mode. Rear A/C blower motor
speed LO or HI. During actuator check
mode. Display code 0. Display code 2.
10 to 14 V Below
1.0 V 10 to 14 V
Below 1.0 V
RFR - Body
ground (L14-19
- Body ground)Y -
Body
groundRear blower
motor operation
signal
Ignition switch ON. Rear A/C blower
motor speed to except HI. Ignition switch
ON. Rear A/C blower motor speed to HI.
During actuator check mode. Display code
0. Display code 2.
10 to 14 V Below
1.0 V 10 to 14 V
Below 1.0 V
FRS - Body
ground (L14-20
- Body ground)B -
Body
groundExhaust damper
servomotor
operation signal
Ignition switch ON. Front A/C blower
motor operates. Push "FRS" switch.
Ambient temperature below -1 °C Ignition
switch ON. Front A/C blower motor
operates. Push "REC" switch.
10 to 14 V Below
1.0 V
(1)w/ Rear A/C
DISPLAY (ITEM)DEFAULTCONTENTSSETTING

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)

DTC B1442AIR INLET DAMPER CONTROL SERVOMOTOR CIRCUIT
DTC B1451COMPRESSOR SOLENOID CIRCUIT
DTC B1461EMISSION GAS NOX SENSOR CIRCUIT

Fig. 94: DTC Detection Item Trouble Area Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
WIRING DIAGRAM
Fig. 95: Air Inlet Damper Position Sensor Circuit

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 items below in the DATA LIST, and read the displays on the hand-held tester.
DATA LIST / AIR CONDITIONER:
DATA LIST / AIR CONDITIONER
OK:
The display is as specified in the normal condition.
Result:
AIR CONDITIONER TEST RESULT
B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
C: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT )
A: Go to next step
2.INSPECT AIR CONDITIONING AMPLIFIER (TPI - SG)
a. Remove the A/C amplifier with connectors still connected.
b. Turn the ignition switch to the ON position.
c. Change the set RECIRC/FRESH to activate the air inlet servomotor.
d. Measure the voltage according to the value (s) in the table below.
Standard:
AIR CONDITIONING AMPLIFIER (TPI - SG) VOLTAGE
Item
Measure Item/Display
(Range)
Normal ConditionDiagnostic Note
A/I DAMP
POSAir inlet damper position /
min.: -14% max.: 113.5%RECIRCULATION: Approx. 0%
FRESH: Approx. 100%-
A/I DAMP
TARGAir inlet damper target /
min.: -14% max.: 113.5%RECIRCULATION: Approx. 0%
FRESH: Approx. 100% HALF-
RECIRCULATION: 43 to 99.5 %-
NGA
OK (Checking from the PROBLEM SYMPTOM TABLE)B
OK (Checking from the DTC)C
Tester connectionConditionSpecified condition
A37-20 (TPI) - A37-19 (SG)RECIRC3.5 to 4.5 V
A37-20 (TPI) - A37-19 (SG)FRESH0.5 to 1.5 V

a. Remove the air inlet servomotor.
b. Measure the resistance according to the value (s) in the table below.
Standard:
AIR INLET SERVOMOTOR RESISTANCE
c. Measure the resistance according to the value (s) in the table below.
HINT:
SEE DTC B1442 AIR INLET DAMPER CONTROL SERVOMOTOR CIRCUIT
for operation
procedure for the air inlet servomotor.
Standard:
AIR INLET SERVOMOTOR RESISTANCE
HINT:
As the air inlet servomotor moves from fresh to recirculation, the resistance decreases gradually without
interruption.
Tester connectionConditionSpecified condition
A41-1 (VZ) - A41-2 (GND)Always4.2 to 7.8 kohms
Tester connectionConditionSpecified condition
A41-3 (PT) - A41-2 (GND)RECIRCULATION3.4 to 6.2 kohms
A41-3 (PT) - A41-2 (GND)FRESH0.8 to 1.6 kohms

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.