2003 LEXUS LS430 air condition

<0029004c004a0011000300140018001c001d00030026004b00480046004e004c0051004a0003002b004400550051004800560056000300240051004700030026005200510051004800460057005200550003000b0025004f0052005a004800550003003000
520057005200550003[- Air Conditioning Amplifier)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go to next step
6.CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - BODY GROUND) (SEE
ELECTRONIC CIRCUIT INSPECTION PROCEDURE
)
a. Measure the resistance according to the value (s) in the table below.
Standard:
BLOWER MOTOR - BODY GROUND RESISTANCE
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
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520057005200550003[
- Body Ground)
Tester connectionConditionSpecified condition
B2-1 (GND) - Body groundAlwaysBelow 1 ohms

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go to next step
8.INSPECT BLOWER MOTOR
a. Remove the blower motor.
b. Connect positive (+) lead to terminal 2 of the blower motor connector and negative (-) lead to
terminal 1.
OK: Blower motor operates smoothly.
Fig. 162: Inspecting Blower Motor

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE BLOWER MOTOR
OK: Go to next step
9.INSPECT AIR CONDITIONING AMPLIFIER (BLW - BODY GROUND)
a. Remove the A/C amplifier with connectors still connected.
b. Turn the ignition switch to the ON position.

c. Turn the blower switch on (Lo).
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2f003a0003[
- Body Ground)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
d. Measure the waveform between terminal BLW (A11-5) of the A/C amplifier and body ground.
OK:
Waveform operate as shown in the illustration.
HINT:
Waveform varies with the blower level.
NG: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT
)

Fig. 166: Identifying Location Of Fuse (RR ECU-B)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO
FAILURE FUSE (RR ECU-B)
OK: Go to next step
2.INSPECT REAR AIR CONDITIONING AMPLIFIER (R-B - BODY GROUND)
a. Remove the rear A/C amplifier assy and disconnect the connector.
b. Measure the voltage according to the value (s) in the table below.
Standard:
REAR AIR CONDITIONING AMPLIFIER (R-B - BODY GROUND) VOLTAGE
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (REAR AIR CONDITIONING
AMPLIFIER -BATTERY)
Tester connectionConditionSpecified condition
A46-3 (R-B) - Body groundAlways10 to 14 V

Fig. 167: Inspecting Rear Air Conditioning Amplifier (R-B - Body Ground)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE
CIRCUIT DESCRIPTION
The main power source is supplied to the A/C amplifier when the ignition switch is turned to the ON position.
The power source supplied is used for operating the A/C amplifier and servomotor, etc.
WIRING DIAGRAM

FUSE (RR A/C) RESISTANCE
NG: CHECK FOR SHORT IN ALL HARNESS AND COMPONENTS CONNECTED TO
FAILURE FUSE (RR A/C FUSE)
OK: Go to next step
2.INSPECT REAR AIR CONDITIONING AMPLIFIER (IG - GND)
a. Remove the A/C amplifier assy 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:
REAR AIR CONDITIONING AMPLIFIER (IG - GND) VOLTAGE
NG: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE
Tester itemConditionSpecified condition
RR A/C fuseAlwaysBelow 1 ohms
Tester connectionConditionSpecified condition
A46-10 (IG) -A46-6 (GND)Ignition switch OFF --> ONBelow 1 V --> 10 to 14 V

Fig. 169: Inspecting Rear Air Conditioning Amplifier (IG - GND)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
3.CHECK HARNESS AND CONNECTOR (REAR AIR CONDITIONING AMPLIFIER -
BATTERY) (SEE ELECTRONIC CIRCUIT INSPECTION PROCEDURE
)
a. Disconnect the rear A/C amplifier connector.
b. Measure the voltage according to the value (s) in the table below.
Standard:
REAR AIR CONDITIONING AMPLIFIER -BATTERY VOLTAGE
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
Tester connectionConditionSpecified condition
A46-10 (IG) - Body groundIgnition switch OFF --> ONBelow 1.0V --> 10 to 14 V