2003 LEXUS LS430 Identifying ac

Fig. 11: Identifying Rear Audio And Rear A/C Control SW Function Chart
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STEERING PAD FUNCTION
Fig. 12: Identifying Steering Pad Function Chart

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1.RADIO RECEIVER ASSY
Fig. 13: Radio Receiver Assy ECU Terminal Connector

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elements come on during the SW check mode.
It takes about 40 seconds to complete the check.
Turn all the elements in the LCD on.
When pressing the switch, confirm beep sound is emitted.
Press the "SEEK TRACK UP" switch to enter the "System Check Screen".
Fig. 19: Identifying Disc Switch

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2.System Check Screen.
a. Reference:
In the system check mode, the system check and the diagnostic memory check are performed, and the
check results are displayed in ascending order of the component codes (physical address.)
TERMS MEANING CHART
TermsMeaning
Component code
(Physical address)Three-digit code (In hexadecimal) given to each device comprising AVC-LAN.
Corresponding to its function, individual symbol is provided.
Logical addressTwo-digit code (In hexadecimal) given to each function and device unit in each

Fig. 20: Identifying Read System Check Result
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3.Detailed information mode (when displaying the DTC for a trouble component)

a. With "CHEC" or "ECHN" being displayed, press the preset switch "2" to go to the detailed
information mode.
b. Press the "SEEK TRACK" switch to display the "System check result (SYS)" and "Diagnostic
memory response (CODE)".
Fig. 21: Identifying Seek Track Switch To Display

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Fig. 37: Identifying CD
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3.CHECK USING ANOTHER CD
a. Check using another CD.
1. Check if the problem recurs using another CD.
OK: The problem does not occur.
OK: REPLACE THE CD
NG: Go to next step
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

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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. 45: Identifying Power Source Circuit (Stereo Component Tuner) Wiring Diagram
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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

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