LEXUS LS430 2003 Factory Repair Manual

4.AUDIO AND REAR A/C CONTROL SW
Fig. 17: Audio And Rear A/C Control SW ECU Terminal Connector

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TERMINAL DESCRIPTION CHART
ATX- (S31-20) -
GND (S31-25)R - W-BAVC-LAN
communication signalTurn ignition switch to
ACC2 to 3 V
MTX- (S31-21) -
GND (S31-25)B - W-BAVC-LAN
communication signalTurn ignition switch to
ACC2 to 3 V
GND (S31-25) -
Body groundW-B - Body
groundGroundAlwaysBelow 1 ohms
(1)w/ LEXUS Navigation System
Symbols (Terminal
No.)Wiring
ColorTerminal DescriptionConditionSpecification

5.GATEWAY ECU
Fig. 18: GATEWAY ECU Terminal Connector

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TERMINAL DESCRIPTION CHART
1.Starting Diagnostic Mode (All elements come on during the SW check mode).
a. Turn off the audio system and turn the ignition switch to the ACC position. While pressing the
preset switches "1" and "6" at the same time, press the "DISC" 3 times.
b. Reference:
<003a004b0048005100030057004b004800030056005c0056005700480050000300480051005700480055005600030057004b004800030027004c0044004a005100520056004c005600030030005200470048000f0003002500480048005300030056005200
58005100470003004c0056000300480050004c005700570048[d 3 times and all the
+B (A35-1) - GND
(A35-4)W-R - BBatteryAlways10 to 14 V
TX+ (A35-3) -
GND (A35-4)O - BAVC-LAN
communication signalTurn ignition switch to
ACC2 to 3 V
GND (A35-4) -
Body groundB - Body
groundGroundAlwaysBelow 1 ohms
ACC (A35-5) -
GND (A35-4)G - BAccessory (ON)Turn ignition switch to
OFF --> ACCBelow 1 V --> 10
to 14 V
TX- (A35-8) - GND
(A35-4)B-Y - BAVC-LAN
communication signalTurn ignition switch to
ACC2 to 3 V
Symbols (Terminal
No.)Wiring ColorTerminal DescriptionConditionSpecification
GTX+ (G3-6) - GND
(G3-24)B - W-BAVC-LAN communication
signalTurn ignition switch
to ACC2 to 3 V
GTX- (G3-21) - GND
(G3-24)W - W-BAVC-LAN communication
signalTurn ignition switch
to ACC2 to 3 V
GND (G3-24) - Body
groundW-B - Body
groundGroundAlwaysBelow 1
ohms

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

3.Finishing Diagnostic Mode.
a. Press the "DISC" for 2 seconds or more, or turn the ignition switch off.
HINT:
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.Start the diagnostic mode (SEE DIAGNOSTIC START
-UP/FINISH ).
2.Read the system check result.
1. Press the "SEEK TRACK" switch to see the check result of each component.
2. The component device code (physical address) is displayed first, and then the check result follows.
HINT:
If all check results are "good" the system judges that no DTC exists.
device comprising AVC-LAN

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. 22: System Check Mode Sheet
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c. Displayed Items in Detailed Information Mode
Fig. 23: Items Detailed Information Mode Chart

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d. Check the trouble area referring to the DTC list.
e. To return to the service check mode, press the preset switch "3".
1.Clearing Individual DTC Memory (when clearing the memory of the DTC detected in the past
individually)
a. Press the preset switch "5" for 2 seconds or more while the "ECHN" is displayed in the system
check mode or during the detailed information mode.
HINT:
Beep sound is emitted once when the DTC memory is completely cleared.
When the DTC memory is cleared, only the component code (physical address) is displayed
for the target component.
To check DTCs, press the preset switch "1" and perform the system check again.
2.<0026004f004800440055004400510046004800030052004900030044004f004f00030057004b00480003002700370026000300500048005000520055005c0003000b005a004b0048005100030046004f004800440055004c0051004a00030044004f004f00
030057004b0048000300500048005000520055005c00030052[f the DTCs detected in the past)
a. Start the diagnostic mode after repairing the trouble area.
b. Press the preset switch "5" for 2 seconds or more. ("CLR" is displayed at this time.)
HINT:
Beep sound is emitted once when the DTCs memory is completely cleared.
When the DTCs memory for all the component is cleared, only the component codes
(physical address) are displayed.
c. Press the preset switch "1" to perform the service check again, and check that no DTCs are
displayed for all the component codes (physical address).

1.DATA LIST
HINT:
By the DATA LIST displayed on the hand-held tester, you can read the value of the switch, sensor,
actuator and so on without removing any parts. Reading the DATA LIST as the first step in
troubleshooting is one of the methods to shorten labor time.
a. Connect the hand-held tester to the DLC3.
b. Turn the ignition switch to the ON position.
c. According to the display on the tester, read the "DATA LIST".
SPAD:
Fig. 24: Spad Item Chart

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DIAGNOSTIC TROUBLE CODE CHART
HINT:
Titles for each unit are stated in the followin
g order: parts name (physical address) [Name indicated by DTC]
TermsDescription
Physical address3-digit, hexadecimal code assigned to all components connected to the AVC-LAN.
Individual symbols are specified based on function. Units whose names are unknown or
relevant units are displayed with physical addresses.
Logical address2-digit, hexadecimal code assigned to all the functions in the AVC-LAN system.

1.RADIO RECEIVER ASSY (Physical address: 190) [AUDIO H/U]
a. Logical address: 01 (Communication control)
HINT:
Methods used to verify the cause of the problem are listed in order of probability in the verification
column.
Fig. 25: DTC Detecting Condition Chart

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HINT:
*1: Even if no failure is detected, a trouble code may be recorded depending on the battery
condition or engine start voltage.
*2: If the power connector is disconnected after the engine starts, this code is recorded after
180 seconds.
*3: This code may be stored if the ignition key is turned again after the engine starts.