warning LEXUS LS430 2003 Factory Manual PDF

30.INSPECT SRS WARNING LIGHT (SEE DIAGNOSIS SYSTEM )
31.PERFORM INITIALIZATION (SEE INITIALIZATION
)
COMPONENTS
Fig. 156: Exploded View Of Parking Brake Cable Assy No.1

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

73.INSPECT PARKING BRAKE PEDAL TRAVEL (SEE ADJUSTMENT )
74.ADJUST PARKING BRAKE PEDAL TRAVEL (SEE ADJUSTMENT
)
75.INSTALL INSTRUMENT PANEL UNDER COVER SUB-ASSY NO.2 (SEE REPLACEMENT
)
76.INSTALL INSTRUMENT PANEL AIR BAG ASSY LOWER NO.1 (SEE REPLACEMENT
)
77.INSTALL INSTRUMENT PANEL SAFETY PAD SUB-ASSY NO.1 (SEE REPLACEMENT
)
78.INSTALL OUTER MIRROR SWITCH ASSY
79.INSTALL COIN BOX ASSY
80.INSTALL INSTRUMENT PANEL UNDER COVER SUB-ASSY NO.1 (SEE REPLACEMENT
)
81.INSTALL INSTRUMENT CLUSTER FINISH PANEL CENTER LOWER
82.INSTALL INSTRUMENT CLUSTER FINISH PANEL END
83.CONNECT BATTERY NEGATIVE TERMINAL
84.INSPECT SRS WARNING LIGHT (SEE DIAGNOSIS SYSTEM
)
85.CHECK FOR EXHAUST GAS LEAKS
86.PERFORM YAWRATE SENSOR ZERO POINT CALIBRATION (SEE CALIBRATION
)
87.PERFORM INITIALIZATION (SEE INITIALIZATION
)
COMPONENTS

a. This system uses ultrasonic sensors to detect any obstacles at the corners, the front or the rear of the
vehicle. The system then informs the driver of the distance between the sensors and the obstacles,
as well as their positions by displaying them on the multi-information display in the combination
meter and by sounding a buzzer. This information also appears on the multi-display on the models
equipped with a LEXUS navigation system.
2.FUNCTIONS OF COMPONENTS
FUNCTIONS OF COMPONENTS
3.OPERATION EXPLANATION
a. The clearance warning ECU assy determines whether the clearance sonar system should be
operated or not based on the clearance sonar main switch, the shift position, the vehicle speed and
the engine speed signals.
b. When the system operates, the clearance warning ECU transmits ultrasonic waves from the
ultrasonic sensor. If these waves encounter an obstacle within the sensor's range, the waves are
reflected back to the sensor, which transmits them to the clearance warning ECU assy.
Based on this information, the clearance warning ECU assy sends signals to the multi-information
display, the multi-display and the clearance warning buzzer. The appropriate distance between the vehicle
and the obstacle is then displayed, and the buzzer sounds.
HINT:
Refer to "OPERATION CHECK
" for detailed operation .
ComponentsFunction
Ultrasonic Sensor
Ultrasonic sensor consists of a sensor portion that transmits and receives
ultrasonic waves and a pre-amplifier that amplifies them. The ultrasonic
sensor outputs the ultrasonic transmission and reception signals to the
clearance warning ECU assy.
Clearance Sonar Main
SwitchTurns the clearance sonar system on and off.
Buzzer (No.1 & No.2)Emits an intermittent sound to inform the driver that the ECU has detected
an obstacle within a prescribed range.
Clearance Warning ECU
AssyJudges the approximate distance between the vehicle and the obstacle based
on the signals from the ultrasonic sensors and sends the display signal to the
display panel and buzzer signal to the buzzer.
Gateway ECU
Sends the display signal of the clearance warning ECU assy to the
combination meter and the multi-display. The signal for the multi-display is
output by converting it to an AVC-LAN signal.
Combination Meter (Multi-
information Display) &
Multi-displayDisplays the location of the obstacle and the approximate distance between
the vehicle and the obstacle. On the multi-display, the sound volume, buzzer
sounding distance, and sensor operating condition can be set on the setup
screen for this system.

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

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

various data output from the vehicle's clearance warning ECU.
The clearance warning ECU records DTCs when the computer detects a malfunction in the
computer itself or in its circuits.
To check the DTCs, connect the hand-held tester to the DLC3 on the vehicle. The hand-held
tester enables you to erase the DTCs, activate the several actuators and check the freeze
frame data and data list.
b. Check the DLC3.
The clearance warning ECU follows the CAN and ISO 9141-2 communication protocol. The
terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 9141-2
format.
Fig. 14: Identifying DLC3 Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
TERMINAL NUMBER SPECIFIED CONDITION
Symbols (Terminals No.)Terminal DescriptionConditionSpecified Condition
SIL (7) - SG (5)Bus "+" lineDuring communicationPulse generation
CG (4) - Body groundChassis groundAlwaysBelow 1 ohms
SG (5) - Body groundSignal groundAlwaysBelow 1 ohms
BAT (16) - Body groundBattery positiveAlways11 to 14 V
CANH (6) - CANL (14)HIGH-level CAN bus lineIG switch OFF54 to 67 ohms

a. Connect the hand-held tester to the DLC3.
b. Turn the ignition switch to the ON position.
c. Following the display on the hand-held tester, perform the "ACTIVE TEST".
CSONAR:
VEHICLE CONDITION/TEST DETAILS
If a trouble code is displayed during the DTC check, check the circuit listed for that code in the table below.
DIAGNOSTIC TROUBLE CODE CHART
ItemVehicle Condition/Test DetailsDiagnostic Note
FRONT BUZZERFront buzzer (Clearance warning buzzer No.1)/STOP or OPERATE-
REAR BUZZERRear buzzer (Clearance warning buzzer No.2)/STOP or OPERATE-
DTCDescription
DTC B2231FRONT LEFT SIDE SENSOR MALFUNCTION
DTC B2232FRONT LEFT SENSOR MALFUNCTION
DTC B2233FRONT LEFT CENTER SENSOR
MALFUNCTION
DTC B2234FRONT RIGHT CENTER SENSOR
MALFUNCTION
DTC B2235FRONT RIGHT SENSOR MALFUNCTION
DTC B2236FRONT RIGHT SIDE SENSOR MALFUNCTION
DTC B2237REAR LEFT SENSOR MALFUNCTION
DTC B2238REAR LEFT CENTER SENSOR MALFUNCTION
DTC B2239REAR RIGHT CENTER SENSOR
MALFUNCTION
DTC B2241REAR RIGHT SENSOR MALFUNCTION

Fig. 18: Diagnostic Trouble Code Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
CIRCUIT DESCRIPTION
Ultrasonic sensor consists of a sensor portion that transmits and receives ultrasonic waves and a pre-amplifier
that amplifies them. The ultrasonic sensor outputs the ultrasonic transmission and reception signals to the
clearance warning ECU assy.
Fig. 19: DTC B2231 Detection Condition And Trouble Area Description Chart

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

Fig. 21: Identifying Ultrasonic Sensor Number-1 Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK: Go To Next Step.
2.CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSY -
ULTRASONIC SENSOR NO. 1)
a. Disconnect the C17 connector from the clearance warning ECU assy.
b. Disconnect the U3 connector from ultrasonic sensor No.1.
c. Measure the resistance according to the value (s) in the table below.
TESTER CONNECTION SPECIFIED CONDITION
Tester connection (Symbols)ConditionSpecified value
C17-21 (FLS) - U3-2AlwaysBelow 1 ohms
C17-8 (FGND) - U3-1AlwaysBelow 1 ohms