air conditioning LEXUS LS430 2003 Factory Manual PDF

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 (TPBPa - SG (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 (TPBPA - SG (SG-7) VOLTAGE
HINT:
As the set temperature increases, the voltage decreases gradually without interruption.
Result:
AIR CONDITIONING AMPLIFIER (TPBPA - SG (SG-7) TEST RESULT
NGA
OK (Checking from the PROBLEM SYMPTOM TABLE)B
OK (Checking from the DTC)C
Tester connectionConditionSpecified condition
A37-21 (TPBPa) - A38-19 (SG)MAX. Hot0.5 to 1.8 V
A37-21 (TPBPa) - A38-19 (SG)MAX. Cool3.5 to 4.5 V
NGA
OK (Checking from the PROBLEM SYMPTOMS TABLE)B
OK (Checking from the DTC)C

Fig. 108: Inspecting Air Conditioning Amplifier (TPBPA - SG (SG-7)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
C: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT )
A: Go to next step
3.INSPECT COOL AIR BYPASS SERVOMOTOR
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 accordin
g to the value (s) in the table below.
Tester connectionConditionSpecified condition
C25-1 (VZ) - C25-2 (GND)Always4.2 to 7.2 kohms

OK: Go to next step
4.CHECK HARNESS AND CONNECTOR (COOL AIR BYPASS SERVOMOTOR - AIR
CONDITIONING AMPLIFIER) (SEE ELECTRONIC CIRCUIT INSPECTION PROCEDURE
)
a. Measure the resistance according to the value (s) in the table below.
Standard:
COOL AIR BYPASS SERVOMOTOR - AIR CONDITIONING AMPLIFIER RESISTANCE
Tester connectionConditionSpecified condition
A37-21 (TPBPa) - C25-3 (PT)AlwaysBelow 1 ohms
A37-18 (S5-3) - C25-1 (VZ)AlwaysBelow 1 ohms
A37-19 (SG) - C25-2 (GND)AlwaysBelow 1 ohms
C25-3 (PT) - Body groundAlways10 kohms or higher
C25-1 (VZ) - Body groundAlways10 kohms or higher
C25-2 (GND) - Body groundAlways10 kohms or higher

Fig. 110: 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
The air inlet servomotor is controlled by the A/C amplifier and moves the air inlet servomotor to the desired
position.
Fig. 111: DTC Detection Item Trouble Area Chart

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

Result:
ACTUATOR 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 INLET SERVOMOTOR
a. Remove the air inlet servomotor.
b. Connect the positive (+) lead from the battery to terminal 5 and negative (-) lead to terminal 4, then
check that the lever turns to the "FRESH" position smoothly.
c. Connect the positive (+) lead from the battery to terminal 4 and negative (-) lead to terminal 5, then
check that the lever turns to the "RECIRCULATION" position smoothly.
NGA
OK (Checking from the PROBLEM SYMPTOMS TABLE)B
OK (Checking from the DTC)C

Fig. 114: Inspecting Air Inlet Servomotor
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE AIR INLET SERVOMOTOR
OK: Go to next step
3.CHECK HARNESS AND CONNECTOR (AIR INLET SERVOMOTOR - AIR CONDITIONING
AMPLIFIER) (SEE ELECTRONIC CIRCUIT INSPECTION PROCEDURE
)
a. Measure the resistance according to the value (s) in the table below.
Standard:
AIR INLET SERVOMOTOR - AIR CONDITIONING AMPLIFIER RESISTANCE
Tester connectionConditionSpecified condition
A36-17 (AIR) - A41-4 (REC)AlwaysBelow 1 ohms
A36-16 (AIF) - A41-5 (FRS)AlwaysBelow 1 ohms
A36-17 (AIR) - Body groundAlways10 kohms or higher
A36-16 (AIF) - Body groundAlways10 kohms or higher

Fig. 115: Checking Harness And Connector (Air Inlet 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
In this circuit, the compressor assembly receives a signal on refrigerant compression required by the air
conditioning amplifier. Based on the signal, the compressor assembly changes the degree of refrigerant
compression.
Fig. 116: DTC Detection Item Trouble Area Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
WIRING DIAGRAM
Fig. 117: Compressor Solenoid Circuit

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.INSPECT AIR CONDITIONING AMPLIFIER (SOL+ - SOL-)
a. Remove the A/C amplifier with connectors still connected.
b. Turn the ignition switch to the ON position.
c. Measure the voltage according to the value (s) in the table below.
Standard:
AIR CONDITIONING AMPLIFIER (SOL+ - SOL-) VOLTAGE
HINT:
As the temperature increases, the voltage decreases.
Result:
AIR CONDITIONING AMPLIFIER (SOL+ - SOL-) TEST RESULT
Tester connectionConditionSpecified condition
A11-6 (SOL+) - A11-7 (SOL-)Start the engine Auto switch: ONBelow 1.0 V
ANG
BOK (Checking from the PROBLEM SYMPTOMS TABLE)
COK (Checking from the DTC)

Fig. 118: Inspecting Air Conditioning Amplifier (SOL+ - SOL-)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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 COOLER COMPRESSOR ASSY (AIR CONDITIONER SOLENOID)
a. Disconnect the cooler compressor assy connector.
b. Measure the resistance according to the value (s) in the table below.
Standard:
COOLER COMPRESSOR ASSY (AIR CONDITIONER SOLENOID) RESISTANCE
Tester connectionConditionSpecified condition
1 - 2at 20°C (68°F)10 to 11 ohms