2003 LEXUS LS430 air condition

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Standard (Passenger side):
AIR OUTLET SERVOMOTOR - AIR CONDITIONING AMPLIFIER RESISTANCE
(PASSENGER SIDE)
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
Tester connectionConditionSpecified condition
A36-5 (AOPa1) -A45-6AlwaysBelow 1 ohms
A36-6 (AOPa2) -A45-5AlwaysBelow 1 ohms
A36-7 (AOPa3) -A45-2AlwaysBelow 1 ohms
A36-9 (AOPa4) -A45-1AlwaysBelow 1 ohms
A36-26 (AOPB) - A45-4AlwaysBelow 1 ohms
A36-5 (AOPa1) - Body groundAlways10 kohms or higher
A36-6 (AOPa2) - Body groundAlways10 kohms or higher
A36-7 (AOPa3) - Body groundAlways10 kohms or higher
A36-9 (AOPa4) - Body groundAlways10 kohms or higher
A36-26 (AOPB) - Body groundAlways10 kohms or higher

Fig. 140: Checking Harness And Connector (Air Outlet Servomotor - Air Conditioning Amplifier)
(Passenger'S Side)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT
)
CIRCUIT DESCRIPTION
This servomotor is controlled by the A/C amplifier. Air flow temperature changes when moving the air mix
damper to the target point. The target point can be detected with the air mix damper position sensor.
WIRING DIAGRAM

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.
NG: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT
)
OK: Go to next step
2.PERFORM ACTUATOR CHECK

a. Set the actuator check mode (see ACTUATOR CHECK
).
b. Press the driver temperature up switch and change to the STEP operation.
c. Check the air flow temperature by hand.
DISPLAY CODE - AIR MIX DAMPER OPERATION
OK:
ItemMeasure Item/Display (Range)Normal ConditionDiagnostic
Note
AIR MIX
STEP-DAir mix servomotor target STEP (Driver
side) / min.: 257 STEP max.: 1571 STEPMAX COOL: Approx. 257 STEP
MAX HOT: Approx. 1,571 STEP-
AIR MIX
STEP-PAir mix servomotor target STEP
(Passenger side) / min.: 257 STEP max.:
1571 STEPMAX COOL: Approx. 257 STEP
MAX HOT: Approx. 1,571 STEP-
Display CodeAir Mix Damper Operation
0COOL side (0 % open)
1COOL side (0 % open)
2COOL side (0 % open)
3COOL side (0 % open)
4COOL/HOT (50 % open)
5COOL/HOT (50 % open)
6COOL/HOT (50 % open)
7HOT side (100% open)
8HOT side (100% open)
9HOT side (100% open)

Air flow temperature changes in accordance with each display code.
NG: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT
)
OK: Go to next step
3.INSPECT AIR MIX CONTROL SERVOMOTOR
a. Remove the air mix control servomotor.
b. Measure the resistance according to the value (s) in the table below:
Standard: (Driver side)
AIR MIX CONTROL SERVOMOTOR RESISTANCE (DRIVER'S SIDE)
Tester connectionConditionSpecified condition
A42-1 (AMDr1) -A42-4 (AMDB)Always24.3 to 26.3 ohms
A42-2 (AMDr2) -A42-4 (AMDB)Always24.3 to 26.3 ohms
A42-5 (AMDr3) -A42-4 (AMDB)Always24.3 to 26.3 ohms
A42-6 (AMDr4) -A42-4 (AMDB)Always24.3 to 26.3 ohms

Fig. 142: Inspecting Air Mix Control Servomotor (Driver'S Side)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Standard: (Passenger side)
AIR MIX CONTROL SERVOMOTOR RESISTANCE (PASSENGER SIDE)
Tester connectionConditionSpecified condition
A43-1 (AMPa1) -A43-4 (AMPB)Always24.3 to 26.3 ohms
A43-2 (AMPa2) -A43-4 (AMPB)Always24.3 to 26.3 ohms
A43-5 (AMPa3) -A43-4 (AMPB)Always24.3 to 26.3 ohms
A43-1 (AMPa4) -A43-4 (AMPB)Always24.3 to 26.3 ohms

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE AIR MIX CONTROL SERVOMOTOR
OK: Go to next step
4.CHECK HARNESS AND CONNECTOR (AIR MIX CONTROL SERVOMOTOR - AIR
CONDITIONING AMPLIFIER) (SEE ELECTRONIC CIRCUIT INSPECTION PROCEDURE
)
a. Measure the resistance according to the value (s) in the table below.
Standard (Driver side):
AIR MIX CONTROL SERVOMOTOR - AIR CONDITIONING AMPLIFIER RESISTANCE
(DRIVER'S SIDE)
Tester connectionConditionSpecified condition
A37-1 (AMDr1) -A42-6AlwaysBelow 1 ohms
A37-2 (AMDr2) -A42-5AlwaysBelow 1 ohms
A37-3 (AMDr3) -A42-2AlwaysBelow 1 ohms
A37-4 (AMDr4) -A42-1AlwaysBelow 1 ohms
A37-10 (AMDB) - A42-4AlwaysBelow 1 ohms
A37-1 (AMDr1) - Body groundAlways10 kohms or higher
A37-2 (AMDr2) - Body groundAlways10 kohms or higher
A37-3 (AMDr3) - Body groundAlways10 kohms or higher
A37-4 (AMDr4) - Body groundAlways10 kohms or higher
A37-10 (AMDB) - Body groundAlways10 kohms or higher

Fig. 144: Checking Harness And Connector (Air Mix Control Servomotor - Air Conditioning
Amplifier) (Driver'S Side)