2003 LEXUS LS430 ground clearance

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

1.DESCRIPTION
a. DIAGNOSTIC SYSTEM
When troubleshooting a vehicle with the diagnosis system, the only difference from the usual
troubleshootin
g procedure is connecting the hand-held tester to the vehicle and reading
C17-8 (FGND) -
Body groundP - Body
groundFront sensor
groundAlwaysBelow 1
ohms
C17-9 (FRS) -
C17-8 (FGND)R - PFront right side
sensorSignals are transmitted from the ECU to
the front right side sensor (During OFF
sensing)Pulse
generation
C17-10 (FR) -
C17-8 (FGND)B - PFront right sensor
Signals are transmitted from the ECU to
the front right sensor (During OFF
sensing)Pulse
generation
C17-11 (FCR) -
C17-8 (FGND)G - PFront right center
sensorSignals are transmitted from the ECU to
the front right center sensor (During OFF
sensing)Pulse
generation
C17-12 (FCL) -
C17-8 (FGND)V - PFront left center
sensorSignals are transmitted from the ECU to
the front left center sensor (During OFF
sensing)Pulse
generation
C17-13 (FL) -
C17-8 (FGND)Y - PFront left sensorSignals are transmitted from the ECU to
the front left sensor (During OFF sensing)Pulse
generation
C17-17 (FBZ) -
C17-7 (MGND)O - W-BBuzzer No.1
inputBuzzer No.1 sounding (when the front
sonar and/or front clearance sonar senses
something)Pulse
generation
C17-19 (RBZ) -
C17-7 (MGND)W - W-BBuzzer No. 2
inputBuzzer No. 2 sounding (when the back
sonar and/or rear clearance sonar senses
something)Pulse
generation
C17-20 (RGND) -
Body groundO - Body
groundRear sensor
groundAlwaysBelow 1
ohms
C17-21 (FLS) -
C17-8 (FGND)SB - PFront left side
sensorSignals are transmitted from the ECU to
the front left side sensor (During OFF
sensing)Pulse
generation
C17-22 (RR) -
C17-20 (RGND)Y - ORear right sensor
Signals are transmitted from the ECU to
the rear right sensor (During OFF
sensing)Pulse
generation
C17-23 (RBR) -
C17-20 (RGND)BR - ORear right center
sensorSignals are transmitted from the ECU to
the rear right center sensor (During OFF
sensing)Pulse
generation
C17-24 (RBL) -
C17-20 (RGND)P - ORear left center
sensorSignals are transmitted from the ECU to
the rear left center sensor (During OFF
sensing)Pulse
generation
C17-25 (RL) -
C17-20 (RGND)V - ORear left sensorSignals are transmitted from the ECU to
the rear left sensor (During OFF sensing)Pulse
generation

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

NG: REPLACE ULTRASONIC SENSOR NO.1 (SEE REPLACEMENT )
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 U2 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
C17-13 (FL) - U2-2AlwaysBelow 1 ohms
C17-8 (FGND) - U2-1AlwaysBelow 1 ohms
C17-13 (FL) - Body groundAlways10 kohms or higher
C17-8 (FGND) - Body groundAlways10 kohms or higher

Fig. 29: Identifying Ultrasonic Sensor No.2 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. 2)
a. Disconnect the C17 connector from the clearance warning ECU assy.
b. Disconnect the U1 connector from ultrasonic sensor No.2.
c. Measure the resistance according to the value (s) in the table below.
TESTER CONNECTION SPECIFIED CONDITION
Tester connection (Symbols)ConditionSpecified value
C17-12 (FCL) - U1-2AlwaysBelow 1 ohms
C17-8 (FGND) - U1-1AlwaysBelow 1 ohms
C17-12 (FCL) - Body groundAlways10 kohms or higher
C17-8 (FGND) - Body groundAlways10 kohms or higher

Fig. 33: Identifying Ultrasonic Sensor No.2 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. 2)
a. Disconnect the C17 connector from the clearance warning ECU assy.
b. Disconnect the U4 connector from ultrasonic sensor No.2.
c. Measure the resistance according to the value (s) in the table below.
TESTER CONNECTION SPECIFIED CONDITION
Tester connection (Symbols)ConditionSpecified value
C17-11 (FCR) - U4-2AlwaysBelow 1 ohms
C17-8 (FGND) - U4-1AlwaysBelow 1 ohms
C17-11 (FCR) - Body groundAlways10 kohms or higher
C17-8 (FGND) - Body groundAlways10 kohms or higher

Fig. 37: Identifying Ultrasonic Sensor No.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 U5 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
C17-10 (FR) - U5-2AlwaysBelow 1 ohms
C17-8 (FGND) - U5-1AlwaysBelow 1 ohms
C17-10 (FR) - Body groundAlways10 kohms or higher
C17-8 (FGND) - Body groundAlways10 kohms or higher

Fig. 41: Identifying Ultrasonic Sensor No.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 U6 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
C17-9 (FRS) - U6-2AlwaysBelow 1 ohms
C17-8 (FGND) - U6-1AlwaysBelow 1 ohms
C17-9 (FRS) - Body groundAlways10 kohms or higher
C17-8 (FGND) - Body groundAlways10 kohms or higher