navigation system LEXUS LS430 2003 Factory Manual PDF

as follows.
1. To solve sound problems, etc. caused by using components of different manufacturers
through signal standardization.
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. I
f
the radio and navigation assy is equipped, it is the master unit.
The radio receiver 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.
5.Communication system outline
a. Components of the navigation system communicate with each other via the AVC-LAN.
b. Radio receiver assy has enough resistance (60 to 80 ohms) necessary for transmitting the
communication. This is essential for communication.
c. If a short circuit or open circuit occurs in the AVC-LAN circuit, communication is interrupted and
the navigation system will stop functioning.
6.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.
7.Bluetooth outline
a. BLUETOOTH is a new wireless connection technology that uses the 2.4 GHz frequency band. This
makes it possible to connect a cellular phone (BLUETOOTH capable phone*1) to the multi-display
(BLUETOOTH system is built in), and use a hands-free function with the cellular phone in a
pocket or bag. As a result, it is not necessary to use a connector for the cellular phone.
*1: Some versions of BLUETOOTH capable cellular phone may not function.
HINT:
The communication performance of BLUETOOTH may vary depending on obstructions or radio
wave conditions between communication devices, electromagnetic radiation, communication
device sensitivit
y, or antenna capacity.

Fig. 10: Identifying Bluetooth Capable Cellular
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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.
The screen displays nothing (go to step 6, proceed to "BLACK SCREEN (NO IMAGE APPEARS
ON NAVIGATION/AUDIO SCREEN)")
Other symptoms (go to step 3)
3.Confirm the system normal condition (see SYSTEM NORMAL CONDITION CHECK
)
Applicable (This is not a malfunction.)
Not applicable (go to step 4)
4.Check the diagnostic trouble codes (see DIAGNOSTIC TROUBLE CODE CHART
)
HINT:
If the system cannot enter the diagnosis mode, inspect each AVC-LAN communication signal and

repair or replace problem parts (see AVC-LAN CIRCUIT (NAVIGATION ECU -STEREO
COMPONENT TUNER) - AVC-LAN CIRCUIT (NAVIGATION ECU - TELEVISION
CAMERA ECU) ).
Even if the malfunction symptom is not confirmed, check the diagnostic trouble codes. This is
because the system stores past diagnostic trouble codes.
Refer to the detailed description on the diagnostic screen, as necessary (see DIAGNOSIS
DISPLAY DETAILED DESCRIPTION ).
Check and clear the past diagnostic trouble code. Check the diagnostic trouble code and inspect the
area the code indicates.
A code is output (go to step 5)
A code is not output (go to step 6)
5.(see DIAGNOSTIC TROUBLE CODE CHART
)
Find the output code on the diagnostic trouble code chart.
Output the diagnostic trouble code (go to step 8)
6.(see PROBLEM SYMPTOMS TABLE
)
Find the applicable symptom code in the problem symptoms table.
HINT:
If the symptom does not recur and no code is output, perform the symptom reproduction method (see
HOW TO PROCEED WITH TROUBLESHOOTING
).
There is an applicable symptom code in the table (go to step 8)
There is no applicable symptom code in the table (go to step 7)
7.Check the ECU terminal arrangement based on the malfunction symptom (see TERMINALS OF
ECU )
8.Check the circuit
Adjust, repair or replace as necessary.
9.Recheck the DIAGNOSTIC TROUBLE CODE CHART

HINT:
After deleting the DTC, recheck the diagnostic trouble code.
10.Perform confirmation test

Fig. 33: Displaying Screen Color Bar
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
4.Check each color of the color bar when the "NAVI Color Bar Check" screen is displayed.
HINT:
Colors will not be displayed full-screen as in "Display Check Mode".
HINT:
This mode displays product information on the navigation systems and discs.
Illustrations may differ from the actual vehicle depending on the device settings and options. Therefore,
some detailed areas may not be shown exactly the same as on the actual vehicle.
1.Enter diagnostic mode (see DIAGNOSTIC START
-UP/FINISH ).

Fig. 52: Displaying Memory Copy/Paste Screen
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
HINT:
This function cannot be used.
(f) If the symptom is applicable to any of the following, it is intended behavior, and not a malfunction.
DISPLAY CHART
SymptomAnswer
A longer route than expected is chosen.Depending on the road conditions, the navigation ECU
may determine that a longer route is quicker.
Even when distance priority is high, the
shortest route is not shown.Some paths may not be advised due to safety concerns.
When the vehicle is put into motion
immediately after the engine starts, the
navigation system deviates from the actual
position.
If the vehicle starts before the navigation system
activates, the system may not react.
When running on certain types of roads,
especially new roads, the vehicle position
deviates from the actual position.When the vehicle is driving on new roads not available
on the map disc, the system attempts to match it to
another nearby road, causing the position mark to
deviate.

Fig. 53: Identifying System Normal Condition
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
(g) The following symptoms are not a malfunction, but are caused by errors inherent in the GPS, gyro
sensor, speed sensor, and navigation ECU.
1. The current position mark may be displayed on a nearby parallel road the vehicle actually runs on.