LEXUS LS430 2003 Factory Repair Manual

HINT:
Clearance sonar display does not appear on the multi-display if the shift lever is moved to the
R position.
Because sound waves are used for detection range measurement, the detection range may
chan
ge slightly due to the peripheral temperature.
Ignition
switchClearance sonar main
switchShift
positionVehicle speedEngine speed
ONONR position10 km/h (6 mph) or
less2,500 RPM or
less

Fig. 7: Identifying Back Sonar Display
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
h. Check the multi-information display, the multi-display and the buzzer sounding condition when the
clearance sonar sensor detects an obstacle.
Operation condition:
Front clearance sonar:
CLEARANCE SONAR MAIN SWITCH

Rear clearance sonar:
CLEARANCE SONAR MAIN SWITCH
HINT:
Clearance sonar display does not appear on the multi-display if the shift lever is moved to the
R position.
Because sound waves are used for detection range measurement, the detection range may
chan
ge slightly due to the peripheral temperature.
Ignition
switchClearance sonar
main switchShift positionVehicle speedEngine speed
ONONIn any position
except P and R10 km/h (6
mph) or lessN position 1,500 RPM or less
Except N position 2,500 RPM or
less
Ignition
switchClearance sonar main
switchShift
positionVehicle speedEngine speed
ONONR position10 km/h (6 mph) or
less2,500 RPM or
less

Fig. 8: Identifying Clearance Sonar Display
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
2.INITIAL CHECK FUNCTION CHECK
a. Turn the ignition switch to the ON position.
b. Drive the engine at 2,500 RPM or less with the shift lever in any position except N, or at 1,500
RPM or less with the shift lever in the N position.

c. After turning the ignition switch to the ON position, wait for 2 seconds or more, then turn the
clearance sonar main switch on. Check the multi-information display and the buzzer sounding
condition.
Standard:
After the main switch is turned on, the multi-information display shows the Fig. 9
below
for approximatel
y 2 seconds and the buzzer sounds for approximately 1 second then the
detection mode begins.
Fig. 9: Identifying Multi
-Information Display
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
HINT:
Multi-information display:
The malfunctioning sensor blinks on the display when the wire harness or the connector is
faulty and requires repair or replacement, or when trouble is detected in the ultrasonic sensor
circuits. After the sensor operation returns to normal, the detection mode will finish
normall
y.

Fig. 10: Identifying Trouble Detection Display
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Multi-display:
The malfunctioning sensor is displayed when the wire harness or the connector is faulty and
requires repair or replacement, or when trouble is detected in the ultrasonic sensor circuits.
After the sensor operation returns to normal, the detection mode will finish normally.
Fig. 11: Identifying Trouble Detection Display (Multi
-Display)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
HINT:
The following can be customized.
WARNING
CUSTOMIZE PARAMETERS
SENSOR
CUSTOMIZE PARAMETERS
DISPLAY (ITEM)DEFAULTCONTENTSSETTING
F BUZ SPECIFIED
(Front buzzer specified)OFFFunction to make front buzzer sound when
obstacles are within approximately 500 to
1,000 mm (19.69 to 39.37 in.) in the front of
the vehicle.ON/OFF
R BUZ SPECIFIED
(Rear buzzer specified)ONFunction to make rear buzzer sound when
obstacles are within approximately 500 to
1,000 mm (19.69 to 39.37 in.) in the rear of
the vehicle.ON/OFF
NO MOVE BUZZ (No
move judgement buzzer)ONFunction to make buzzer sound when vehicle
speed is 0 km/h and sensors detect obstacles.ON/OFF
KEY BATTERY BUZ
(Key battery buzzer)ONFunction to make the warning available when
the smart key battery is low.ON/OFF
KEEP SENSE BUZ
(Keep sense status
buzzer)ONFunction to make buzzer sound when
distance between vehicle and obstacle does
not change for more than 3 seconds.ON/OFF
F&R BUZZER FREQ
(Front & rear buzzer
frequency)1.0/1.5Function to change frequency of front and
rear buzzers.(1/1.5)/ (1.3/1.8)/
(1.5/2)
F&R BUZZER VOLM
(Front & rear buzzer
volume)M2Function to change volume of front and rear
buzzers.L/M1/M2/M3/H
DISPLAY (ITEM)DEFAULTCONTENTSSETTING
R SENSOR (Rear
sensor)ONFunction to make 4 rear sensors available.ON/OFF

DISPLAY
DISPLAY ITEM DESCRIPTION
Check the circuits for each problem symptom in the order given in the table below, and proceed to the relevant
troubleshooting page.
REV RNG SENS
(Reverse range
sensor)
Fsde2,RFunction to set available sensors when shift
position is R.ALL/Fcrn4,R/Fsde2,R
NON-P/R RNG
SEN (Non P/R range
sensor)
FFunction to set available sensors when shift
position is not P or R.ALL/F,Rcrn2/F
SENSOR COND/N
(Sensor condition N
range)
ONFunction to make sensors available when shift
position is N.OFF/ON
F SIDE DIST SEN
(Front side distance
sensor)
LONG
Function to change maximum distance that front
side sensors are able to detect. (SHORT: 375
mm (14.76 in.), LONG: 500 mm (19.69 in.))
SHORT / LONG
DISPLAY (ITEM)DEFAULTCONTENTSSETTING
APPRCH DISP
OFF (Approach
display off)
OFF
Function to make multi-information display turn
off when vehicle starts to leave obstacles which
are within approximately 250 mm (9.84 in.) of
vehicle.
ON/OFF
DISP TIMEOUT
(Display timeout
time)
INVALID
Function to change time until multi-information
display turns off when detected distance by
sensors does not change.
5s/10s/20s/INVALID
SONAR DISP OFF
(Sonar display off
time)
3s
Function to change time until multi-information
display turns off after sensors stop detecting
obstacle.
1s/2s/3s/4s

Fig. 12: Problem Symptoms Table
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
1.CLEARANCE WARNING ECU ASSY

Fig. 13: Identifying Clearance Warning ECU Assy Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
TERMINAL NUMBER SPECIFIED CONDITION
Terminal No.
(Symbols)Wiring
colorTerminal
descriptionConditionSpecified
value
C17-3 (CLSW) -
C17-7 (MGND)LG - W-BClearance sonar
main switchIG switch ON
Clearance sonar main switch ON
10 to 14 V
C17-4 (FBZ+) -
C17-7 (MGND)GR - W-BBuzzer No.1
outputBuzzer No.1 sounding (when the front
sonar and/or front clearance sonar senses
something)Pulse
generation
C17-5 (IG) - C17-
7 (MGND)BR - W-BIG signal/IG
power sourceIG switch ON10 to 14 V
C17-6 (RBZ+) -
C17-7 (MGND)L - W-BBuzzer No. 2
outputBuzzer No.2 sounding (when the back
sonar and/or rear clearance sonar senses
something)Pulse
generation
C17-7 (MGND) -
Body groundW-B -
Body
ground
ECU groundAlwaysBelow 1
ohms