LEXUS LS430 2003 Factory Repair Manual

Fig. 6: Communication Signal Reference Chart (GATEWAY)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
CAN:
Fig. 7: Communication Signal Reference Chart (CAN)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
BEAN (Instrument Panel):

Fig. 8: Communication Signal Reference Chart BEAN (Instrument Panel)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
BEAN (Door):
Fig. 9: Communication Signal Reference Chart BEAN (Door)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
BEAN (Column):

Fig. 10: Communication Signal Reference Chart BEAN (Column)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
AVC-LAN:
Fig. 11: Communication Signal Reference Chart (AVC
-LAN)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
1.METER GAUGE AND WARNING/INDICATOR
GAUGE:
GAUGE DETAIL
WARNING/INDICATOR:
ItemDetail
SpeedometerBased on a signal received from the wheel speed sensor, the skid control ECU
calculates vehicle speed and transmits the data to the meter (Direct line).
TachometerECM transmits engine speed to the meter display (Direct line).
Water Temperature
GaugeDisplays water temperature receiving a signal from the ECM (BEAN).
Fuel GaugeReceives the fuel sender gauge signal from the luggage room J/B ECU (BEAN).

WARNING/INDICATOR DETAILS
2.MULTI-INFORMATION DISPLAY
ItemDetail
TURN SIGNALReceives the turn signal from the driver side J/B ECU (Direct line).
BEAMReceives the beam signal from the driver side J/B ECU (BEAN).
CHARGEReceives the malfunction charge signal from the ECM (BEAN).
CHECK E/GReceives the malfunction charge signal from the ECM (Direct line).
DOOROpen door indicator comes on receiving from a signal each door ECU (BEAN).
D BELTReceives the driver seat belt signal (Unfastened) from the driver side J/B ECU
(BEAN).
BELTReceives the passenger seat belt signal (Unfastened) from the airbag sensor ECU
(BEAN).
BRAKEReceives the parking brake switch/brake fluid level warning signal from the skid
control ECU (BEAN).
CRUISEReceives the malfunction signal from the ECM (BEAN).
AIR BAGReceives the malfunction signal from the airbag sensor ECU (BEAN).
A/TPReceives the P signal from the ECM (BEAN).
A/T RReceives the R signal from the ECM (BEAN).
A/T NReceives the N signal from the ECM (BEAN).
A/T DReceives the D signal from the ECM (BEAN).
A/T SReceives the S signal from the ECM (BEAN).
SLIPReceives the malfunction signal from the skid control ECU (BEAN).
VSC OFFReceives the malfunction signal from the skid control ECU (BEAN).
WASHERReceives the washer level warning switch from the front light control ECU (BEAN).
ABSReceives the malfunction skid control ECU (BEAN).
TEMS SPORTReceives the sports mode signal from the air suspension ECU (Direct line).
ECT POWERReceives the power mode signal from the ECM (BEAN).
ECT SNOWReceives the snow mode signal from the ECM (BEAN).
AFS OFFReceives the AFS OFF signal from the AFS ECU (BEAN).
TAIL or HEADReceives the malfunction tail or head signal from driver side J/B ECU (BEAN).

Fig. 12: Identifying Multi-Information Display Areas
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
The multi-information display consists of three display areas (computer area, graphic area, and
warning area) and the master warning indicator. These areas display the contents given in the table
below.
A steering pad switch (for multi-information display) that switches the contents of the multi-
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ITEM DETAILS
3.MULTI-INFORMATION DISPLAY FLOW CHART
ItemDetails
Computer areaDisplays cruise information. In addition, the contents of the display can be switched by
operating the DISP1 of the steering pad switch.
Graphic area
Displays the following information (radar cruise, clearance sonar, open door, compass,
and outside temperature). The items from "Compass" to "Blank" (via outside
temperature) can be switched by operating the DISP2 of the steering pad switch.
Warning areaDisplays warning messages. These messages appear only if an abnormal signal has been
input by a system.
Master
warning
indicatorComes on/blinks with buzzer sounding in accordance to direction from the displayed
item in the warning area.

Fig. 13: Multi-Information Display Flow Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

a. Warning area

Fig. 14: Warning Area Flow Chart (1 Of 2)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Fig. 15: Warning Area Flow Chart (2 Of 2)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Warning process:
The warning items can be scrolled automatically. (Unable to switch manually)
When any malfunction in the framed items is detected, a warning buzzer (a single sound)
sounds. It sounds only when the malfunction occurs for the first time. The item is displayed
along with the buzzer sounding.
The most current warning item is displayed first.
When two or more warning occur, they are displayed in turn at an interval of 2 seconds.
When a warnings occurs, the item is displayed for 6 seconds only the first time.
Smart Key System:
The buzzer in the smart key system is controlled by a signal from the security ECU.
HINT:
The buzzer sounds continuously if the item "Shift to P range" is displayed.
Oil Maintenance Display:
The items are displayed in accordance with the distance after reset (see ON-VEHICLE

INSPECTION ).
b. Computer area
The items from "Range Over ***/Range Approx ***" to "BLANK" can be changed with the
DISP1 (switch) of the steering pad switch.
c. Graphic area
Open Door Display:
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51005600110003[
HINT:
If the warning item other than the door warning is detected at the same time, the master warning
comes on/blinks in accordance to direction from the displayed item in the warning area.
Park Sonar Display:
See HOW TO PROCEED WITH TROUBLESHOOTING for details on the park sonar display.
The display blinks when the clearance is the closest.
Others:
The items "COMPASS", "OUTSIDE TEMPERATURE" and "BLANK" can be changed with the
DISP2 (switch) of the steering pad switch.
While +B is connected, the mode that was on when the ignition switch was turned off the last time
is displayed.
When the display is changed from radar cruise, it is displayed for only 6 seconds and then returns
to the radar cruise display.
While the radar cruise is on, "RADAR CRUISE READY" is displayed in the warning area if the
park sonar and door open displays are in the graphic area.
Radar Cruise Display:
See HOW TO PROCEED WITH TROUBLESHOOTING for details on the radar cruise
display.
The radar cruise set display is interrupted for only 6 seconds while the park sonar and/or open door
(displays) are on.
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close. This warning has priority over all.
1.VEHICLE BROUGHT TO WORKSHOP
2.(SEE CUSTOMER PROBLEM ANALYSIS CHECK
)
3.PROBLEM SYMPTOM CONFIRMATION (SEE PROBLEM SYMPTOMS TABLE
)
4.CHECK MULTIPLEX COMMUNICATION SYSTEM (SEE HOW TO PROCEED WITH
TROUBLESHOOTING )
a. Check for DTC outputs