2003 LEXUS LS430 Factory Repair Manual

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Page 705 of 4500

LEXUS LS430 2003 Factory Repair Manual By converting the digital signals to analog, it can play music and other things. In general, CD
players can play 4.7-inch (12 cm) or 3.2-inch (8 cm) disc.
HINT:
Do not disassemble any part of the

Page 706 of 4500

LEXUS LS430 2003 Factory Repair Manual 2. To allow each manufacturer to concentrate on developing products they do best. From this,
reasonably priced products can be produced.
HINT:
If a +B or GND short is detected in the AVC-LAN circu

2. To allow each manufacturer to concentrate on developing products they do best. From this,
reasonably priced products can be produced.
HINT:
If a +B or GND short is detected in the AVC-LAN circuit, communication is interrupted and the
audio system will stop functioning.
If an audio system is equipped with a navigation system, the multi-display unit acts as the master
unit. If the navigation system is not equipped, the audio head unit acts as the master unit instead. If
the radio and navigation assy is equipped, it is the master unit.
The radio and navigation assy provides resistance to make communication possible.
The car audio system with an AVC-LAN circuit has a diagnostic function.
Each component has a specified number (3-digit) called a physical address. Each function has a
number (2-digit) called a logical address.
3.Communication system outline
a. Components of the audio system communicate with each other via the AVC-LAN.
b. The master component of the AVC-LAN is a radio receiver assy with a 60 to 80 ohms resistor. This
is essential for communication.
c. If a short circuit or open circuit occurs in the AVC-LAN circuit, communication is interrupted and
the audio system will stop functioning.
4.Diagnostic function outline
a. The audio system has a diagnostic function (the result is indicated on the master unit).
b. A 3-digit hexadecimal component code (physical address) is allocated to each component on the
AVC-LAN. Using this code, the component in the diagnostic function can be displayed.
1.Vehicle brought into a workshop
2.Diagnostic questioning and symptom confirmation (SEE CUSTOMER PROBLEM ANALYSIS
CHECK )
Ask the customer about symptoms and confirm malfunctions. Fill out the Customer Problem Analysis
check sheet.
Pressing PWR switch does not turn on system (SEE PROBLEM SYMPTOMS TABLE
)
Other symptoms (go to step 3)
3.Check the diagnostic trouble codes (SEE SYSTEM CHECK MODE (DTC CHECK)
)
HINT:
If the audio system is equipped with a multi-display, check DTCs in the LEXUS NAVIGATION
SYSTEM section (SEE PRECAUTION
).

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LEXUS LS430 2003 Factory Repair Manual If the system cannot enter the diagnosis mode, inspect each AVC-LAN communication signal and
repair or replace problem parts (SEE AVC
-LAN CIRCUIT (STEREO COMPONENT
AMPLIFIER ASSY - STEREO COMPONENT

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LEXUS LS430 2003 Factory Repair Manual Fig. 4: Customer Problem Analysis Check Sheet
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Page 709 of 4500

LEXUS LS430 2003 Factory Repair Manual 1.Radio Description
a. Radio frequency band
1. Radio Broadcasts use the radio frequency bands shown in the table below.
Fig. 5: Radio Frequency Band Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A.,

Page 710 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 6: Identifying Service Area
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
2. Radio reception problems
HINT:
In addition to static, other problems such as "phasing", "multi-path"

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LEXUS LS430 2003 Factory Repair Manual Fig. 7: Identifying Phasing Area
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
2. Multi-path
A radio signal can sometimes be reflected by an obstruction in its path. When this occurs, the
reflected

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LEXUS LS430 2003 Factory Repair Manual Fig. 8: Identifying Multi-Path Area
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
3. Fade out
FM radio frequency is higher than AM. Therefore, it is more likely to be reflected by large
obstruction

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