2003 LEXUS LS430 damper

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
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 (TPBDr - SG-7)
a. Remove the A/C amplifier with connectors still connected.
b. Turn the ignition switch to the ON position.
c. Change the set temperature to activate the cool air bypass servomotor.
d. Measure the voltage according to the value (s) in the table below.
Standard:
AIR CONDITIONING AMPLIFIER (TPBDr - SG-7) VOLTAGE
ItemMeasure Item/Display (Range)Normal ConditionDiagnostic
Note
A/B DAMP
POS-DCool air bypass damper position (Driver
side) / min.: -14% max.: 113.5%OPEN: Approx. 0 % SHUT:
Approx. 100%-
NGA
OK (Checking from the PROBLEM SYMPTOM TABLE)B
OK (Checking from the DTC)C
Tester connectionConditionSpecified condition
A36-24 (TPBDr) - A36-15 (SG-7)MAX. Hot0.5 to 1.8 V
A36-24 (TPBDr) - A36-15 (SG-7)MAX. Cool3.5 to 4.5 V

a. Remove the cool air bypass servomotor.
b. Measure the resistance according to the value (s) in the table below.
Standard:
COOL AIR BYPASS SERVOMOTOR RESISTANCE
c. Measure the resistance according to the value (s) in the table below.
HINT:
SEE COOL AIR BYPASS DAMPER CONTROL SERVOMOTOR CIRCUIT (DRIVER SIDE)
for
operation procedure for the cool air bypass servomotor.
Standard:
COOL AIR BYPASS SERVOMOTOR RESISTANCE
HINT:
As the cool air bypass servomotor moves from the cool side to the hot side, the resistance decreases
gradually without interruption.
Tester connectionConditionSpecified condition
C24-1 (VZ) - C24-2 (GND)Always4.2 to 7.2 kohms
Tester connectionConditionSpecified condition
C24-3 (PT) - C24-2 (GND)Max. Cool3.33 to 4.03 kohms
C24-3 (PT) - C24-2 (GND)Max. Hot0.80 to 1.60 kohms

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. 105: TPBPR Terminal Voltage/Damper Opening Angle Graph
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Fig. 106: DTC Detection Item Trouble Area Chart

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

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%-

HINT:
SEE COOL AIR BYPASS DAMPER CONTROL SERVOMOTOR CIRCUIT (PASSENGER
SIDE) for operation procedure for cool air bypass servomotor.
Standard:
COOL AIR BYPASS SERVOMOTOR RESISTANCE
HINT:
As the cool air bypass servomotor moves from the cool side to the hot side, the resistance decreases
gradually without interruption.
Fig. 109: Inspecting Cool Air Bypass Servomotor

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE COOL AIR BYPASS SERVOMOTOR
Tester connectionConditionSpecified condition
C25-3 (PT) - C25-2 (GND)Max. Cool3.33 to 4.03 kohms
C25-3 (PT) - C25-2 (GND)Max. Hot0.80 to 1.60 kohms

Fig. 112: Air Inlet Damper Control Servomotor Circuit
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.PERFORM ACTUATOR CHECK

a. Remove the glove box to see and check the air inlet servomotor operation.
b. Set the actuator check mode (SEE ACTUATOR CHECK
).
c. Press the DEF switch to set the STEP operation.
d. Press the DEF switch in order and check the operation of the air inlet servomotor.

Fig. 113: Checking Actuator
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
DISPLAY CODE - RECIRCULATION DAMPER POSITION
OK:
Recirculation damper changes in accordance with each display code.
Display codeRecirculation damper position
0FRESH
1FRESH
2RECIRCULATION / FRESH
3RECIRCULATION
4FRESH
5FRESH
6FRESH
7FRESH
8FRESH
9FRESH