2003 LEXUS LS430 Diagram AC

Fig. 148: TD Terminal Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.INSPECT DLC3 TERMINAL VOLTAGE (OPB TERMINAL)
a. Turn the ignition switch to the ON position.
b. Measure the voltage according to the value (s) in the table below.
TESTER CONNECTION STANDARD SPECIFIED CONDITION
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
Tester ConnectionSpecified Condition
D1-11 (OPB) - D1-4 (CG)10 to 14 V
D1-4 (CG) - Body groundBelow 1 ohms

Fig. 2: Audio System Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Input and output signals of each ECU.
TRANSMITTING ECU (TRANSMITTER) CHART
1.CD (Compact Disc) player outline
a. A compact disc player uses a laser pickup to read digital signals recorded on a compact disc (CD).
Transmitting ECU
(Transmitter)
Receiving ECUSignalsCommunication method
Driver Side J/B ECUSteering Pad SwitchACC SW SignalBEAN (Column Bus)
Driver Side J/B ECUSteering Pad SwitchTaillight ON SignalBEAN (Column Bus)
Steering Pad SwitchRadio Receiver AssyAudio SignalBEAN (Column Bus) AVC-
LAN

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CIRCUIT DESCRIPTION
This circuit provides the power to the radio receiver assy.
WIRING DIAGRAM
Fig. 43: Identifying Power Source Circuit (Radio Receiver Assy) Wiring Diagram

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INSPECTION PROCEDURE
1.INSPECT RADIO RECEIVER ASSY (+B, ACC, GND)

Fig. 44: Disconnecting Radio Receiver Assy Connector R2
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CIRCUIT DESCRIPTION
This circuit provides the power to the stereo component tuner.
WIRING DIAGRAM

Fig. 45: Identifying Power Source Circuit (Stereo Component Tuner) Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.INSPECT STEREO COMPONENT TUNER (B, ACC, GND)
a. Disconnect the stereo component tuner connector S31.
b. Measure the resistance according to the value (s) in the table below.
Standard:
TESTER CONNECTION CONDITION CHART
Tester connectionConditionSpecified condition
GND - Body groundAlwaysBelow 1 ohms

WIRING DIAGRAM
Fig. 47: Stereo Component Amplifier Assy Wiring Diagram

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INSPECTION PROCEDURE
1.INSPECT STEREO COMPONENT AMPLIFIER ASSY (+B, +B2, ACC, GND, E)
a. Disconnect the stereo component amplifier assy connector S29, S30.
b. Measure the resistance according to the value (s) in the table below.
TESTER CONNECTION CONDITION CHART
Tester connectionConditionSpecified condition
GND - Body groundAlwaysBelow 1 ohms
E - Body groundAlwaysBelow 1 ohms

Fig. 49: Identifying Standard Model
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CIRCUIT DESCRIPTION
This circuit provides the power to the audio and rear A/C control switch.
WIRING DIAGRAM

Fig. 50: Identifying Audio And Rear A/C Control SW Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.INSPECT AUDIO AND REAR A/C CONTROL SWITCH (+B, ACC, GND)
a. Disconnect the audio and rear A/C control switch connector A35.
b. Measure the resistance according to the value (s) in the table below.
TESTER CONNECTION CONDITION CHART
c. Measure the voltage according to the value (s) in the table below.
TESTER CONNECTION CONDITION CHART
Tester connectionConditionSpecified condition
GND - Body groundAlwaysBelow 1 ohms
Tester connectionConditionSpecified condition
+B - GNDAlways10 to 14V